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Journal of Strain Analysis for Engineering Design
Journal Prestige (SJR): 0.615  Citation Impact (citeScore): 1 Number of Followers: 5  Hybrid journal (It can contain Open Access articles)ISSN (Print) 0309-3247 - ISSN (Online) 2041-3130 Published by Sage Publications  [1176 journals]
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- Shakedown of a plate with a circular hole: An educational problem
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Authors: Yifeng Chen, David Anthony Hills
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
The shakedown limit for an infinite plate containing a circular hole and subject to oscillatory arbitrary remote loading is found, first by using Melan’s lower bound theorem, and secondly by using a finite element model. It is shown that in some cases the limit found from the Melan theorem using the solution for the residual state of stress for an over-pressurized hole provides the exact solution, specifically when the limiting factor is the reversal of the state of stress at a particular point, while in other cases the shakedown limit is rather higher.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-03-27T09:05:32Z
DOI: 10.1177/03093247231163205
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- Free vibration response of bidirectional functionally graded rotating
micro-disk under mechanical and thermal loading-
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Authors: Suman Pal, Debabrata Das
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
The present work studies the free vibration response of functionally graded rotating micro-disks subjected to transverse pressure and thermal loading based on the modified couple stress theory. The disk material is considered to be functionally graded along the radial and thickness directions, and its properties are assumed to be temperature-dependent following the Touloukian model. The mathematical formulation is based on an energy functional involving the von Kármán type non-linearity, in which appropriate displacement derivatives and its conjugate stress measures are used to define the strain energy of the micro-disk. The minimum potential energy principle is employed to develop the governing equations for determining the deformed configuration of the micro-disk under combined centrifugal, pressure and thermal loading. Further, the governing equations for free vibratory motion of the micro-disk are derived following Hamilton’s principle and incorporating the tangent stiffness of the deformed micro-disk. The governing equations are discretized and solved employing the Ritz method. The mathematical model is successfully validated with different reduced problems available in the literature. The influence of rotational speed, transverse pressure, thermal loading, size-dependent thickness and volume fraction indices are investigated for a wide range of parametric values. Some illustrative mode shapes along with the contour have also been presented. The present study is first of its kind and the presented results would definitely serve as benchmarks for any further study in this field.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-03-21T11:06:34Z
DOI: 10.1177/03093247231160617
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- A simulation method for dynamic force and vibrations of a roller bearing
in the planetary gears considering the roller profile-
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Authors: Jing Liu, Zhifeng Shi, Jin Xu, Yan Cheng, Hongwu Li
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
The roller profile shape can change the fatigue life and vibrations for planet roller bearing (PRB), as well as the impact between the rollers and cage. In this study, an analytical study of the dynamic forces and vibrations of a PRB considering the roller profile. To avoid the stress concentration at the roller ends, the roller modification method is proposed to improve the dynamic forces. The contact stiffness and load-deformation exponent of the roller-race interaction for four different roller modification types are achieved. A PRB dynamic model is established to discuss the effects of roller modification types on the dynamic forces and vibrations for PRB. Computation results of those four roller modification types are compared to the results of the PRB with the cylindrical roller type. It includes that the roller profile shape can greatly change the contact forces between the rollers and races, as well as the impact forces between the rollers and cage. The roller profile shapes can also influence the vibrations of PRBs.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-03-17T12:49:20Z
DOI: 10.1177/03093247231159820
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- Free vibration analysis of bio-inspired helicoid laminated composite
plates-
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Authors: Aman Garg, Mohamed-Ouejdi Belarbi, Li Li, Neha Sharma, Ayushi Gupta, Hanuman Devidas Chalak
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Helicoidal schemes possessed by biological creatures possess high strength and stiffness. The adoption of the layup configurations possessed by these biological creatures is not fully explored. The present article aims to carry out the free vibration analysis of biological-inspired laminated composite (B-ILC) plates having helicoidal layup. The analysis is carried out using higher-order zigzag theory (HOZT) as due to the presence of several layers, the HOZT can predict the behavior accurately compared to the shear deformation theory. Based on Hamilton’s principle, the governing equations are worked out and analyzed using the finite element method. The influence of boundary conditions, geometric properties, number of layers, the skew angle of the plate, and material properties on the free vibration behavior are studied in detail.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-03-13T12:24:40Z
DOI: 10.1177/03093247231160414
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- Generalized phenomenological model to analyze the forming limit curve of
Al 1050-
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Authors: Zahra Ramezani Anbaran, Faraz Rahimzadeh Lotfabad, Ramin Ebrahimi, Habib Danesh Manesh
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
In this investigation, the previously proposed phenomenological model in the literature is generalized both in terms of the mathematical form of the model and the yield function used to describe the plasticity of the material. Al 1050 is chosen as the model material, where the sheets made from this material are first annealed and then subjected to a tensile test and Erichsen cupping test to obtain tensile properties as well as the FLC of the material. The constants of the generalized model are first obtained by curve fitting, whereby in this approach least overall error is expected as a single equation is used to predict the FLC of material. Further, it is shown that it would be possible to enhance the accuracy of the model at the cost of losing the applicability of a single mathematical expression for both branches of FLC. In this approach, the generalized model would be calibrated for the right branch based on Swift’s model and for the left branch based on Hill’s model. Finally, the effect of the yield criterion used to describe the plasticity of the material on the predictions of the generalized model is investigated, and it is shown that using the Hosford yield criterion yields better results compared to using the von Mises yield criterion.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-02-07T10:22:00Z
DOI: 10.1177/03093247231152288
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- Flexural analysis of second-order corrugated composite cores:
Experimental, numerical, and theoretical studies-
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Authors: Peyman Talaie, Mahdi Shaban, Sanaz Khoshlesan
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Corrugated cores with structural hierarchy are one types of advanced cores that inspired from nature. In this work, the bending behavior of a second order, hierarchical corrugated structure has been analyzed. Experimental tests are implied to sandwich panels with both first- and second-order corrugated core by means of three-point bending test. For trapezoidal core, finite element model is provided and numerical results are validated by experimental results. Then, the validated properties are used to model sandwich panel with first- and second-order corrugated cores. To make a correct comparison, out-of-plane shear modulus of mentioned cores is calculated. Further to classical approach of ASTM7250, based on the first-order shear deformation theory (FSDT), a closed-form solution is used to predict the out-of-plane core shear modulus and compared with ASTM procedure. Results reveal that including shear deformation effects, the determined shear modulus based on FSDT is larger than classical standard procedure. Furthermore, shear modulus of second-order corrugated core is smaller than first-order one of the same relative densities.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-02-06T09:02:46Z
DOI: 10.1177/03093247231152569
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- Determination of dynamic material properties using laser measurement
technique in split Hopkinson pressure bar-
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Authors: S Mirshafiee, MJ Ashrafi, E Mousavi
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
The split Hopkinson pressure bar (SHPB) is a commonly used technique to measure the stress-strain of materials at high strain rate. Using the strain records in the input and output bars, the average stress-strain and strain rate in the sample can be calculated by SHPB formulas based on the one-dimensional wave propagation theory. The accuracy of a SHPB test is based on this assumption. In this paper, first a laser measuring system is designed, implemented, and calibrated in order to obtain the dynamic properties of different materials using split Hopkinson pressure bar test. In this method which is a non-contact one, the displacements of bar/sample interfaces are measured directly using a laser extensometer technique, by using the provided equations, in addition to the strain, the stress of the tested sample can be calculated. Moreover, the operation of the method is evaluated using numerical simulation. Aluminum 7075 and copper C10200 samples were studied to evaluate the implemented measurement method. The comparison with other measurement methods shows good agreement of numerical and experimental results. Moreover, since the one-dimensional wave propagation is not used directly in this method, we show the proposed method can be used even with shorter pressure bars which can reduce the cost of manufacturing and maintenance of the SHPB apparatus.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-01-29T02:49:58Z
DOI: 10.1177/03093247231152501
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- Finite element implementation of the aortic double-dispersion fibre model
and development of a predictive damage model-
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Authors: A. Corvi, L. Collini
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
With the development of next-generation cardiovascular prosthesis, the requirement for more advanced simulations for predicting the mechanical response of biological tissue has arisen. Finite-element analysis represents a powerful tool capable of simulating complex behaviours within this framework. The present work proposes the computational implementation of an advanced constitutive model for the fibre-reinforced tissue making up the aortic wall. The formulation available in literature is numerically implemented within the FE software Abaqus© through specific user subroutines, and model predictions are compared with the already available single-dispersion-model results. The influence of each dispersion parameter on the macroscopic behaviour is analysed and discussed. Finally, the model is extended by a damage regime based on strain invariants, which is capable of considering the influence of patient ageing on the mechanical response failure strain. The user subroutines are here provided in the Appendix for applications.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-01-29T02:34:07Z
DOI: 10.1177/03093247221150044
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- A computational method for determining the linear elastic properties of 2D
aperiodic lattice structures-
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Authors: Chikwesiri Imediegwu, Uwe Grimm, Richard Moat, Iestyn Jowers
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
This paper develops a framework for determining the linear elastic properties of non-periodic lattice structures. An element-based material assignment methodology is implemented that facilitates the generation and analyses of arbitrary patterns on a structured mesh. An adapted numerical homogenization strategy features the inclusion of a homogenized region in the neighbourhood of the domain boundary that validates the implementation of periodic boundary conditions for an arbitrary finite patch of a periodic or non-periodic lattice structure. To demonstrate the method, the linear elastic properties of an aperiodic lattice pattern based on the Penrose (P3) pattern is evaluated. Such a structure exhibits order without translational symmetry and consequently lacks a repeating unit cell. The isotropic performance of the aperiodic lattice structure is investigated and compared to that of the well-known square periodic lattice. The framework opens the door to the investigation and analyses of other novel cellular structures which are not based on a repeating unit cell. Additive manufacturing facilitates the physical realization of such lattice structures, presenting them as viable alternatives to conventional periodic structures in the aerospace and bio-engineering industries.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-01-26T12:03:05Z
DOI: 10.1177/03093247221150666
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- Representing capabilities of novel semi-analytical triangular plate
elements-
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Authors: Arash Karimi Pour, Ehsan Noroozinejad Farsangi
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Two novel plate-bending elements are developed and investigated in this study. Elements with 13 and 15 degree-of-freedoms are named AT13 and AT15, respectively. These triangular elements are formulated in a semi-analytic way. For this aim, the basic elasticity function is employed with unknown parameters. Subsequently, the trial-and-error procedure is used to determine the unidentified constants. Besides, the achieved results are compared with those obtained by displacement-based triangular elements with the same degrees-of-freedom (TUBA13 and TUBA15). In this research, both stress and displacement responses of diverse structures are assessed. After performing extensive numerical studies, the findings clearly demonstrate the superiorities of the proposed elements.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-01-26T11:55:25Z
DOI: 10.1177/03093247221150043
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- Free vibrations of Timoshenko nanoscale beams based on a hybrid integral
strain- and stress-driven nonlocal model-
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Authors: M Faraji Oskouie, R Ansari, H Rouhi
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Several non-classical elasticity theories are used for considering the size-dependent behavior of structures at small scales. The nonlocal theory is widely used to reflect the softening behavior of material at small scales, and theories like the strain gradient theory are employed to reflect the hardening behavior. In this article, the most general form of integral strain- and stress-driven nonlocal models with two nonlocal parameters is developed which is able to consider both hardening and softening influences simultaneously. To this end, it is considered that the stress field at the entire points of the domain is a function of strain field of the entire points of the domain. The free vibration problem of first-order shear deformable beams is solved herein. The integral form of governing equations and associated boundary conditions are obtained first, and then directly solved in a numerical approach. Through developing an efficient matrix formulation and using differential and integral matrix operators, the discretized governing equations are obtained. The simultaneous effects of strain- and stress-driven nonlocal parameters on the natural frequencies of fully clamped, fully simply-supported, and clamped-free nanobeams are investigated. The results indicate that the paradox related to the behavior of clamped-free nanobeams is resolved using the presented integral nonlocal formulation. Also, it is revealed that it is possible to find some specific values of nonlocal parameters at which the prediction of hybrid nonlocal model coincides with that of classical elasticity theory.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-01-12T10:41:43Z
DOI: 10.1177/03093247221145793
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- The vibration of a gold nanobeam under the thermoelasticity
fractional-order strain theory based on Caputo–Fabrizio’s definition-
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Authors: Eman AL-Lehaibi
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
For the first time, numerical solutions were computed using fractional-order strain considerations in the current study. For an isotropic and homogeneous nanobeam, the thermoelasticity with one relaxation time and fractional-order strain theory based on Caputo–Fabrizio’s definition of fractional derivative was examined. With thermal loading and in simply supported boundary conditions, the Laplace transformations have been used upon the governing equations and its inversion was computed using the Tzou technique approximation. The numerical calculations for a thermoelastic rectangular gold (Au) nanobeam have been validated as a model where ramp-type heat is considered. The computational solutions have been depicted in two-dimensions graphs for several situations to investigate the impact of the fractional-order and ramping heat parameters on all of the functions studied. The temperature increment distribution, lateral vibration, deformation, tension, and energy density are all influenced by fractional-order and ramp-time heat parameters. The ramp-time heat parameter might be utilized to regulate nanobeam vibration and energy damping in thermoelastic nanobeams.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-01-12T10:40:12Z
DOI: 10.1177/03093247221145792
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- Evaluation and optimization of meshless methods to estimation of the
3D-stress intensity factors in mode I–III for fatigue life prediction
cracked shaft under uni and multi-axial cyclic loading-
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Authors: Behrooz Ariannezhad, Shahram Shahrooi, Mohammad Shishehsaz
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
In this research, in order to estimate 3D-Stress Intensity Factors in mode I–III, fatigue crack growth and fatigue life prediction of a cracked shaft under various cyclic loading, meshless methods are evaluated and the most appropriate method is selected. For better results, the Base Functions (BFs) are first identified and their performance and efficiency are compared with each other. In addition, while enriching the BFs in all methods and study the effect of increasing the number of sentences of Polynomial-BFs (m = 4, 7,10) and their Linearity or Quadraticity in the accuracy of calculations, two sets of Extend-Enriched-RBFs including the Multi-Quadrics and Gaussian RBFs are used in MQ-RPIM and EXP-RPIM methods. To optimize the shape parameters in the RPIM method and determine the Penalty Factor in the MLPG method, Uni and Multi-objective PSO algorithm was used. Then, a shaft with an initial semi-elliptic surface crack as a 3D-meshless domain for discretizing the weak differential equations was selected and modeled under a fixed latitude tensile, bending, and torsional cyclic loads. Changing the standard values of the shape parameters and estimating their optimal values by the PSO algorithm and comparison of findings with the results of Experimental, MLPG, PIM, FEM, and XFEM methods, has led to the best answer from the applied methods for calculation of; displacement, strain and stress fields, and the SIFs in Mode I–III. Finally, based on the results of uniaxial cyclic load analysis and selection of the MQ-RPIM method, the Multi-axial Cyclic load analysis has been performed on 3D-domain. During this analysis, the Paris Parametric equation along with the Elliptic equation and Liu’s Virtual Strain Energy (VSE) model was used to estimate the fatigue crack growth and fatigue life prediction of a submersible cracked shaft of a pump used in water pumping stations.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-01-12T10:38:52Z
DOI: 10.1177/03093247221142661
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- Modal characterization of crack network development in an MgO containing
refractory castable-
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Authors: Vinicius Fiocco Sciuti, Rafael Vargas, Rodrigo Bresciani Canto, François Hild
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Damage due to MgO hydration in castables has been studied by bar resonance and recently by Digital Image Correlation (DIC). The hydration reaction kinetics was studied via principal component analyses (PCA) applied to DIC results of images acquired during 60 h of curing and drying of an MgO containing refractory castable. The experiment was carried out in a in-house climatic chamber at 50°C and 50% of relative air humidity. The displacement and maximum eigen strain fields were obtained via DIC. Their PCA revealed the crack network as the most relevant component, with a temporal development of a sigmoidal curve where a two-parameter Weibull law was satisfactorily fitted. The reaction duration was virtually identical for both fields, and only a time shift in reaction initiation and saturation was attributed to the choice of field. The approach allows the need for user-defined thresholds to be avoided for crack quantification.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2023-01-12T10:37:53Z
DOI: 10.1177/03093247221141490
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- Determination of the parameters of material models using dynamic
indentation test and artificial neural network-
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Authors: Samaneh Pourolajal, Gholam Hossein Majzoobi
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Stress-strain curves of materials normally change with strain rate and temperature and are normally defined by material models. In this study, a new technique was developed for determining the constants of material models. This technique was based on dynamic indentation test, numerical simulation using Ls-dyna code and artificial neural network. An indenter of tapered shape was shot against the materials as the target by a gas gun. The experiments were carried out for four strain rates and four temperatures. The target was made of pure copper. The penetration depth-time and load-time histories were captured by a LVDT and a piezoelectric load-cell, respectively and the load-penetration depth curve (P-h) was obtained. This curve is characterized by five parameters which are determined for each indentation test. On the other hand, the indentation test was simulated using Ls-dyna hydrocode. From the simulations, the P-h curves were obtained using Johnson-Cook (J-C) and Zerilli-Armstrong (Z-A) material models and the characterizing parameters of the numerical P-h curves were also identified. Finally, an artificial neural network (ANN) was trained by the numerical P-h curves parameters as the input and the constants of J-C and Z-A models as the output. The trained neural network was then tested by the experimental p-h curves parameters as the input and the constants of J-C and Z-A models as the output. Moreover, a number of dynamic compression tests were performed using the well-known Split Hopkinson Bar at the same strain rates and temperatures used for indentation tests and the stress-strain curves of material were obtained. A reasonable agreement was observed between the stress-strain curves predicted by neural network and the Split Hopkinson Bar. The proposed method does not need sophisticated instrumentation and in fact, the load-time and indentation depth-time histories are directly converted to stress-strain of material using an artificial neural network.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-12-23T12:43:19Z
DOI: 10.1177/03093247221140981
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- Validating out of the box: Identifying a campaign of physical tests
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Authors: Eann A Patterson, Erwin Hack
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
The extent of the domain over which a model validation demonstrates the reliability of a model is discussed and a simple schematic diagram is used to illustrate the domain. The schematic diagram can also be used to optimise the physical test campaign required to demonstrate the reliability of a model for its context of use. The connections to existing validation approaches and procedures are discussed.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-11-24T10:25:16Z
DOI: 10.1177/03093247221138344
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- An dynamical evaluation of size-dependent weakened nano-beam based on the
nonlocal strain gradient theory-
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Authors: Mohammadreza Eghbali, Seyed Amirhosein Hosseini, Mehdi Pourseifi
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
This paper examines the free lateral vibration of a cracked nano-beam based on Euler-Bernoulli beam theory and nonlocal strain gradient theory (NSGT). Due to the importance and application of nanostructures, their mechanical and mechanical properties are essential. The governing equations and boundary conditions related to using the Hamilton principle have been extracted. The beam separation with the nano-beams division into two parts attached to the Torsion spring is modeled. The model calls the excess strain energy due to crack and increases the discontinuity in the deflection slope. This study investigated the effects of crack propagation, crack intensity, material length scale parameter, and various nonlocal parameters. A comparison of previous studies has been published, where a good agreement is observed. The results show that the parameters mentioned above play an important role in dynamical behavior.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-11-21T01:54:59Z
DOI: 10.1177/03093247221135210
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- Study of dynamic mechanical behavior of 1060-H112 aluminum alloy:
Experimental and numerical simulation-
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Authors: Yunfei Deng, Ruiwen Wang, Yinbo Zhang, Huapeng Wu, Gang Wei
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
1060-H112 aluminum alloy with high ductility is widely used in industrial engineering. The study of its dynamic mechanical behavior has theoretical and engineering application value. In this paper, quasi-static tensile tests from room temperature to 250°C and high strain rate compression tests were conducted using a universal material testing machine and a Hopkinson compression bar. By using a hybrid test-numerical simulation method, a modified Johnson-Cook (MJC) strength model and Cockcroft-Latham (C-L) fracture criterion parameters were calibrated. Subsequently, Taylor impact tests were performed on 1060-H112 aluminum alloy specimens with a diameter of 12.66 mm and a length of 50.64 mm in the range of 176.3–483.03 m/s. Upsetting and tensile tearing were observed in the tests. A 12.68 mm diameter blunt nosed projectile impact test on 2 mm 1060-H112 aluminum alloy plate was also conducted with a light gas gun system, and the speed related parameters and failure modes were obtained. Finally, a three-dimensional model corresponding to the test was established in ABAQUS/Explicit finite element simulation software, and the failure modes of the Taylor rod and the velocity parameters and failure modes of the target impact test were predicted. The results show that the MJC strength model and the C-L fracture criterion can predict the experimental results of the two tests accurately. It shows that the MJC strength model and C-L fracture criterion have high accuracy, and they will play an important role in the application of 1060-H112 aluminum alloy in industrial engineering.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-11-10T09:02:06Z
DOI: 10.1177/03093247221135413
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- Computerized analysis of traveling wave vibration characteristics of
aviation thin-walled spiral bevel gears-
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Authors: Qiyong Yang, Chaosheng Song, Siyuan Liu
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Aviation thin-walled spiral bevel gears are prone to traveling wave vibration. This study proposes an efficient traveling wave vibration analysis method based on the contact finite element model of the spiral bevel gears. The excitation vibration modes under the typical working condition is obtained through comparison to the modal analysis and harmonic response analysis. The resonance modes and frequencies are determined by Campbell diagram. The effect of thin-walled structure parameters on the traveling wave vibration of aviation spiral bevel gears is investigated. The results show that the traveling wave vibration of the gear is easily excited by the forward traveling wave and backward traveling wave resonance of 2nd nodal diameter/1st nodal circle, forward traveling wave resonance of the 6th nodal diameter, backward traveling wave resonance of 7th nodal diameter. The increase of gear blank web thickness will decrease peak stresses. The increase of conical web thickness and angle will decrease the peak stresses of compound vibration. The adjacent modals will aggravate the vibration. The decrease of the modal frequency spacing will increase the peak stresses.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-11-08T11:00:22Z
DOI: 10.1177/03093247221133602
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- Influence of discontinuities on the fracture behaviour of CNT reinforced
composites subjected to thermo-mechanical load using XIGA-
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Authors: Aanchal Yadav, Gagandeep Bhardwaj, Rajendra Kumar Godara
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
This paper is aimed to investigate the fracture behaviour of carbon nanotube (CNT) reinforced composite exposed to the thermo-mechanical environment in the presence of discontinuities using the extended isogeometric analysis (XIGA) method. The study focuses on finding the effects of discontinuities present in a finite plate with a pre-existing crack, on the stress intensity factors (SIFs). The mandatory equivalent mechanical and thermal properties are assessed with the help of various micromechanics models. Two types of CNTs are assumed to be reinforced in the epoxy-matrix: single-walled carbon nanotube (SWCNT) and multi-walled carbon nanotube (MWCNT). The CNT reinforced composite is examined for varying volume percentages of CNTs reinforcement. A comparative study is provided to see the influence of mechanical and coupled thermo-mechanical load on SIFs. Adiabatic crack is taken into account for the computational simulation for thermal loading condition. The interaction integral method is used for the extraction of SIFs. The findings of the test reveal that with the rise in the volume percentage of CNTs, the properties such as fracture energy and fracture toughness also rise. Moreover, the fracture of CNT reinforced composites is delayed with the increased content of CNT. The results establish the profound influence of holes on SIFs than the inclusions.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-09-19T07:09:48Z
DOI: 10.1177/03093247221122052
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- The vibration of viscothermoelastic static pre-stress nanobeam based on
two-temperature dual-phase-lag heat conduction and subjected to ramp-type
heat-
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Authors: Hamdy M Youssef, Eman AN Al-Lehaibi
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
In this work, the two-temperature dual-phase-lag theorem has been used to present an analytical mathematical model for calculating the vibration in a viscothermoelastic nano-resonator. The governing equations have been derived when a simply supported nano-resonator is exposed to a ramp-type thermal load and static pre-stress. The governing equations have been solved by using a direct method and obtained the solution in the Laplace transform domain where the inversions of the Laplace transform have been calculated by using the Tzou approximation method. The increments of the dynamic and conductive temperatures, volumetric deformation, and stress regarding the resonator length for various cases of temperature type, static-pre-stress, and viscothermoelastic properties with different values of ramping heat parameter have been presented in figures and studied. The parameter of the two-temperature model, static pre-stress, ramp-type heat parameter, and viscothermoelastic parameter has a significant impact on all functions studied. The ramping time parameter may be utilized to change the thermal and mechanical properties of the nano-resonator.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-09-16T06:42:25Z
DOI: 10.1177/03093247221119303
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- Nonlocal dual-phase-lag thermoviscoelastic response of a polymer microbeam
-
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Authors: Wei Peng, Zezhang Qi, Tianhu He
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Ultra-slow relaxation process of polymers has the memory-dependent feature, integer-order thermoviscoelastic models may fail to describe the dynamic behaviors of viscoelastic structures accurately. Additionally, it is noticed that the small-scale effect of elastic deformation and heat conduction in a non-isothermal temperature environment is becoming significant due to the development of micro-devices. To better capture the memory-dependent effect and the small-scale effect of viscoelastic micro-structures in heat transfer environment, as a first attempt, present work focuses on developing a refined fractional Kelvin-Voigt thermoviscoelastic model by incorporating the nonlocal dual-phase-lag (NDPL) heat conduction model and the modified coupled stress theory (MCST). Then, the model is applied to investigating the transient response of a polymer microbeam subjected to a harmonic thermal loading. The governing equations involving the modified parameters are formulated and then solved by Laplace transform method. Some parametric results are demonstrated to display the impacts of the nonlocal thermal parameter, the material length-scale parameter and the fractional-order parameter on the considered physical quantities. The results show that the small-scale effect and the memory-dependent effects strongly depend on the polymer micro-structure characteristics in thermal environment.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-09-13T06:09:05Z
DOI: 10.1177/03093247221122691
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- Analysis of low velocity impact properties of basalt fiber composites
considering strain rate effect-
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Authors: Mengmeng Yang, An Cui, Xianqing Huang
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
This study focuses on the strain rate effect on the mechanical properties and damage evolution of basalt fiber reinforced composites subjected to low-velocity impact. A constitutive model is developed to accurately analyze the failure behavior of BFRP laminates. The strain-rate-dependent (SRD) model puts emphasis on a modified stress-strain relationship described by dynamic increase factor (DIF) to update mechanical properties timely during the impact loading and the damage evolution simulation is performed with the finite element code of ABAQUS software. The results shown in the LVI simulation confirmed the validity of the SRD model in comparison with the conclusions of experiments. Furthermore, detailed comparisons are discussed between the strain rate dependent (SRD) model and the strain rate independent (SRI) model under various simulations of different impact energy, thickness, and ply angles of laminates.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-09-01T06:36:58Z
DOI: 10.1177/03093247221116582
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- Free vibration characteristics of viscoelastic nano-disks based on
modified couple stress theory-
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Authors: Ali Alizadeh, Mohammad Shishehsaz, Shahram Shahrooi, Arash Reza
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
This paper investigates the vibrational behavior of a viscoelastic and size-dependent nano-disk based on the modified couple stress theory (MCST). The material characteristics in nano-scale are modeled according to Zener viscoelastic constitutive relation. In addition, displacement components are defined based on classical plate theory. Leaderman integral is also used to determine the viscous parts of the stress tensor. Hamilton’s principle is utilized to derive the governing equations of motion for specifying the strain, kinetic energy, and viscous work. The obtained equations are discretized with the help of the Galerkin method and decoupled through the diagonalization procedure. Laplace transformation is employed to solve the resulting equations in differential–integral form. The damping ratio, the imaginary part and real part of the Eigen frequency of the considered nano-disk are calculated to investigate the effects of influential parameters on the nano-disk vibrational behavior. These parameters include nonlocal parameter boundary conditions, geometric constant, power constant, and element relaxation coefficient. Results obtained on different mode shapes indicate that increasing the dimensionless element relaxation coefficient is followed by a decrease in the imaginary part of the Eigen frequency regarding the energy dissipation as well as a decrease in the real part of the Eigen frequency. Furthermore, increasing the h/l ratio is accompanied by variations in the imaginary part, real part, and damping ratio. According to the results, the effect of damping on vibrational behavior of the nano disk is more distinguished for smaller values of h/l.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-08-18T06:37:30Z
DOI: 10.1177/03093247221116053
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- Experimental and numerical investigation of residual stress distribution
in Al-6061 tubes under using tubular channel angular pressing process by
new trapezoidal channel-
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Authors: Amir Aghababaei, Mohammad Honarpisheh
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Tubular channel angular pressing (TCAP) method is an appropriate severe plastic deformation (SPD) techniques for the generation of ultra-fine grained (UFG) and nanostructured (NS) tubes. In forming methods, the measurement of residual stresses is very important due to their significant effects on the processed samples. Therefore, determining the residual stresses created by the TCAP method in metals is of great importance. In this research, the distribution of residual stresses in Al-6061 tubes under the TCAP process, was studied experimentally and numerically. For this purpose, first the TCAP process was applied on Al-6061 tubes and after that the residual stresses generated in the TCAPed tubes were measured. Sachs method was used experimentally to measure the residual stresses. Sachs method is one of the destructive, convenient and efficient methods for measuring the residual stresses of axisymmetric cylindrical samples. Residual stresses measured by Sachs method in the processed samples showed that the tensile and compressive residual stresses were created on the external and internal tube surfaces, respectively. In addition, a good agreement was existed between the results of the numerical simulation and experimental methods for measuring the residual stress distribution.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-08-04T12:51:13Z
DOI: 10.1177/03093247221113229
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- Limitations of double compression to determine static recrystallization
fraction-
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Authors: Baochun Zhao, Tao Zhang, Xiaoxuan Hu
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
It is well known that double deformation method is widely used to determine static recrystallization volume fraction. And static recrystallization volume fraction for many materials have ever been evaluated by the methods, as 0.2% offset, 2% offset, back-extrapolation, 5% total strain, mean flow stress and area (strain energy) methods. These methods are based on characteristic stress or strain energy (CS). However, materials can exhibit different flow behaviors during hot working process, which results in a difficulty to designate CS. Therefore, there are some limitations for the methods. In the present work, these six methods were divided into two groups: group I, the CS designated on experimental curves and group II, CS designated on semi-experimental curves. And typical curves were analyzed to find out the limitations of the methods, which can be used to rationalize the method selection to evaluate static recrystallization volume fraction.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-08-02T12:22:51Z
DOI: 10.1177/03093247221116033
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- Stress concentration in shape memory alloy sheets with circular cavities:
Effects of transformation, saturation, and plasticity-
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Authors: Sayyed Mohammad Hosseini, Mohammad Javad Ashrafi
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
The analysis of stress concentration in geometrically heterogeneous smart structures is of great importance. In this study, by utilizing a recent constitutive model which considered both transformation and plasticity of shape memory alloys (SMAs), the stress concentration factor (SCF) in plates with circular cavities is investigated and the effect of phase transformation, saturation, and plasticity which may occur locally is studied. The results show that the conversion of the austenitic phase to the martensite leads to a reduction in SCF. After saturation of phase transformation at the stress concentration point, the SCF increases until the entire sheet enters the martensite phase. In the example under study, the SCF reaches 5.8 which is greatly higher than the elastic SCF. By entering the plastic region locally, the SCF reduces. Also, the modeling of sheets with more than one cavity has been done. It is concluded that extra hole, as a stress relief method, has a stronger effect on decreasing maximum stress concentration of shape memory alloys (considering transformation and plasticity) compared to purely elastic stress concentration studies.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-07-27T06:31:31Z
DOI: 10.1177/03093247221113755
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- Research on the stability analysis of milling of thin-walled parts based
on the dynamic characteristics-
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Authors: Yang Liu, Chencheng Zhao, NingYuan Cui, Xinxin Yan, YunGao Chen, HaiYing Liang, XiaoYu Cai, Yue Shan, KuiYuan Bao
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Chatter in thin-walled parts is easy to occur in the process of machining, so the analysis of the stability of thin-walled parts has always been a research hotspot. In this paper, considering the influence of cutter eccentricity on milling force first, the coefficients of milling force were able to be identified by combining the milling force model with genetic algorithm. The results show that this method can obtain the milling force coefficients only by one experiment, and the accuracy is higher. Then the tool point Frequency Response Function (FRF) for a given combination can be calculated by using the Receptance coupling substructure analysis (RCSA) method that uses Timoshenko beam theory. Finally, the milling system can be divided into three types by aspect ratio. That is, when aspect ratio is less than 0.03, the system is considered to be a rigid tool-flexible workpiece system, but aspect ratio is between 0.03 and 0.2, the system is considered to be a flexible tool-flexible system, then aspect ratio is greater than 0.2, the system is considered to be a flexible cutter-rigid workpiece system.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-07-27T06:30:19Z
DOI: 10.1177/03093247221113231
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- 3-D analytical solution of non-homogeneous transversely isotropic thick
closed cylindrical shells-
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Authors: Zahra Mohammadi, Bahram Navayi Neya, Azizollah Ardeshir-Behrestaghi, Peter D Folkow
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
This paper presents an effective analytical method based on displacement potential functions (DPF) for solving 3D static problem of thick and multilayer transversely isotropic cylindrical shells with simply supported end boundary conditions. By using the DPF method, the three-dimensional elasticity equations are simplified and decoupled into two linear partial differential equations of fourth and second order as governing differential equations. The governing equations are solved by the separation of variable method in terms of fields that exactly satisfy end boundary conditions and the continuity of a closed cylinder in the hoop direction. The analysis covers a straightforward solution process for handling problems on multilayered cylindrical shells of transversely isotropic material, adopting all boundary and continuity conditions. Extensive sets of general radial loads located on the inner and outer faces of the cylindrical shell may be stated and examined with in a systematic manner. Comparisons are performed to other existing analytical results for one and multilayered cylindrical shells, and show excellent agreement for different materials, thicknesses and aspect ratios of the shell. In addition, various more involved problems are studied and solved analytically for single and three-layered shells of transversely isotropic material with different sets of radial loading functions at the outer and inner shell surfaces. The results of the present study can be used as benchmark solutions for other studies.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-07-07T10:14:09Z
DOI: 10.1177/03093247221110117
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- A computationally efficient C0 continuous finite element model for
thermo-mechanical analysis of cross-ply and angle-ply composite plates in
non-polynomial axiomatic framework-
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Authors: Yadwinder Singh Joshan, Aakash Soni, Neeraj Grover
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
In the present article, the thermo-mechanical bending response of multi-layered composite plates is investigated in the framework of inverse-hyperbolic shear deformation theory using a generalized finite element model. The mathematical development is carried out under the assumptions of linear structural kinematics for the materials following generalized Hooke’s law. Energy-based finite element formulation and the principle of minimum potential energy are employed to develop the finite element governing equations. A computationally efficient C0 continuous finite element formulation is developed to examine the response of laminated composites subjected to constant, linear, and non-linear temperature change. Numerical analyses are carried out for composite laminates considering various lamination sequences (cross-ply as well as angle-ply), boundary conditions, loading conditions, span-thickness ratio, etc. The present results are compared with the existing analytical and numerical results and their agreement is observed. The effect of fiber orientation angle on bending response is analyzed to enable the optimal design of laminated composite structures under thermo-mechanical loading.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-07-02T09:21:27Z
DOI: 10.1177/03093247221107194
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- Topological study about deformation behavior and energy absorption
performances of 3D chiral structures under dynamic impacts-
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Authors: Yuchen Wei, Chunyang Huang, Ling Ren, Yiming Liang, Zhaobo Wu, Mengqi Yuan
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
The dynamic deformation behavior and energy absorption characteristics of the 3D chiral structures were analyzed by the explicit dynamics analysis module of ANSYS/LS-DYNA. The 3D chiral structure arrayed with different micro-cell parameters cells are established. The respective influences of impact velocities, rotation angles, number and diameter of beams on the deformation behaviors, the dynamic plateau stresses, the absorbed energy, and crush stress efficiency (CSE) are explored in detail. It is shown that the 3D chiral structure exhibits torsional effect and has better energy absorption properties under low-speed impact. At high speed impact, the 3D chiral structure is affected by the impact reinforcement. This leads to a segmentation characteristic between plateau stress and impact velocity for 3D chiral structures. For the given impact velocity, the dynamic plateau stresses are related to the number and diameter of beam by a power law and a quadratic curves, respectively. The results of this study provide scientific guidance and technical support for the optimization and effective design of 3D chiral structures.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-06-02T01:18:14Z
DOI: 10.1177/03093247221101803
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- GFRP reinforced high performance glass–bolted joints: Development of a
simplified finite element-based method for analysis-
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Authors: Mithila Achintha
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
This paper presents the development of finite element (FE)-based computational models that can be used for predicting the failure load of GFRP-reinforced annealed and heat-strengthened glass–bolted joints. Stress analysis of a single-bolt, single-glass-piece case was first carried out in order to develop the computational models and to establish an appropriate failure criterion for the GFRP-reinforced glass–bolted joints. The computational models were then calibrated against the experimental results reported in a previous experimental study involving reference and reinforced double-lap tension joint test specimens. The paper shows that the failure of both reference and reinforced glass–bolted joints can be predicted using the maximum principal-tensile-stress-based failure of glass. The results also confirm that the use of adhesively bonded GFRP reinforcement has potential to increase the load capacity of the reinforced glass–bolted joints compared to the reference glass–bolted joints.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-05-31T12:22:55Z
DOI: 10.1177/03093247221101789
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- A mesh refinement scheme for fourth order bi-harmonic equation of mixed
boundary-value elastic problems-
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Authors: Aminul Islam Khan, Pranta Rahman Sarkar, Abdus Salam Akanda
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Fourth order bi-harmonic equation is extensively used for stress-strain analysis of mixed boundary-value elastic problems. However, currently existing uniform mesh scheme based on finite difference method (FDM) needs vast amount of computational resources and efforts for an acceptable solution. Therefore, in this study, a mesh refinement (MR) scheme based on FDM is developed to solve fourth order bi-harmonic equation effectively. The developed MR scheme allows high resolution computation in sub-domains of interest and relatively low resolution in other regions which overcomes the memory exhausting problems associating with the traditional uniform mesh based FDM. In this paper, sub-domain that needs high resolution (mesh refinement) are identified based on gradient of stress and displacement vectors. A very high gradient in any region signifies the need of fine mesh because coarse grained meshes are not adequate to capture the sharply changing stresses or displacements. Once the sub-domains of interest are identified, the mesh refinement is done by splitting course meshes into smaller meshes. Several new stencils are created to satisfy the fourth order by harmonic equation and associated boundary conditions over the various sizes of meshes. The developed MR scheme has been applied to solve several classical mixed boundary-value elastic problems to show its applicability. In addition, the validity, effectiveness, and superiority of the MR scheme have been established by comparing of obtained solutions with uniform mesh results, finite element method (FEM) results, and the well-known analytical results. Our results show that the developed MR scheme can provide a more reliable and accurate result than the conventional uniform mesh scheme with a reduced number of equations, thus, saves a huge amount of computational memory.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-05-03T10:58:49Z
DOI: 10.1177/03093247221097031
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- Nonlinear dynamics of flexible diaphragm coupling’s rotor system
during maneuvering flight-
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Authors: Yinxin Yu, KangKang Ding, Tianyu Zhao, Kuan Li
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
In this paper, the flexible multi-diaphragm coupling which is used as flexible power transmission shaft of the aeroengine accessory is taken as the research object, and the coupling stiffness matrix and axial nonlinear stiffness of the diaphragms are considered in the coupling rotor system. On this basis, in order to consider the influence of aircraft maneuvering load, in non-inertial system the bending-pendular-axial coupled differential equations of flexible diaphragm coupling were established by Lagrange method. The modal characteristics of the flexible diaphragm coupling were analyzed and compared with the finite element solutions, and the correctness of model is verified. Runge-Kutta method is used to solve and analyze the influence of different maneuvering flight conditions on the vibration characteristics of the flexible diaphragm coupling. The research indicates that the coupling between diaphragm’s axial and radial stiffness leads to the right shift of resonant region, the increase of resonance peak value, and the nonlinear characteristics of amplitude-frequency curve such as jump and multi-value. In the non-inertial system, only the installation distance a of the flexible diaphragm coupling along the wingspan leads to the increase of the axial deformation offset of the flexible diaphragm coupling in the rolling flight state. The increase of climbing or diving angular velocity makes the flexible diaphragm coupling’s vibration changes from single period to multi-period, bifurcation or chaos state; With the increase of diving angular velocity and rolling angular velocity, the axial critical speed gradually increases; Each flight condition not only affects the vibration characteristics, but also causes the axial, radial and angular deformation of the flexible diaphragm coupling to a certain extent. This study provided a theoretical basis and method for the design and analysis of diaphragm coupling.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-05-03T10:53:19Z
DOI: 10.1177/03093247221095281
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- Compound influence of surface and flexoelectric effects on static bending
response of hybrid composite nanorod-
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Authors: Kishor Balasaheb Shingare, Susmita Naskar
First page: 73
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Nanoscale beams and rods are extensively used in several nano-electro-mechanical systems (NEMS) and their applications such as sensors and actuators. The surface and flexoelectricity phenomena have an extensive effect on nanosized structures and are related to their scale-dependent characteristics. This article presents the effect of different surface parameters and flexoelectricity on the electrostatic response of graphene-reinforced hybrid composite (GRHC) nanorods (NRs) using the theory of linear piezoelectricity, Euler-Bernoulli (EB), and Galerkin residual method. Based on these theories, the theoretical and finite element (FE) model is produced to investigate the static bending deflection of GRHC NRs when subjected to point and uniformly distributed load (UDL) considering different boundary conditions: cantilever (FC), fixed-fixed (FF), and simply supported (SS). This proposed FE model provides a useful tool for analyzing and investigating the outcomes of analytical models, which are found to be in good agreement. Our results presented in this article reveal that the effect of surface and flexoelectricity on the static bending response of GRHC NRs is noteworthy. These effects diminish with increased thickness/diameter of NR, and hence, these effects can be neglected for large-sized structures. The results presented here would help to identify the desired electrostatic response of GRHC NRs in terms of static bending response for a range of NEMS using different loading and boundary conditions as well as graphene volume fraction. This current study offers pathways for developing new proficient novel GRHC materials with enhanced control authority and present models can be exploited for numerous other materials as well as line-type structural systems such as beams, wires, rods, column/piers, and piles to study their global response.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-05-09T08:10:17Z
DOI: 10.1177/03093247221096518
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- Flat and rounded contacts: Modelling the effect of a moment with
application to fretting fatigue tests-
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Authors: James PJ Truelove, David A Hills, Luke E Blades
First page: 91
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
The problem of elastic indentation by a punch having the form of a flat front face but with edge rounding, and subject to both a normal load and moment, indenting an elastically similar half-plane is considered. Contact pressure in the neighbourhood of the edges shows a local peak, and the object of the paper is to show how different combinations of normal load and moment can give rise to the same near edge behaviour and peak pressure. The result found is very simple, and of direct practical application in fretting fatigue studies, both analytical and experimental.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-04-07T10:53:56Z
DOI: 10.1177/03093247221089548
-
- Effect of fillers on compression loading performance of modified
re-entrant honeycomb auxetic sandwich structures-
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Authors: Nadimul Haque Faisal, Lindsay Scott, Findlay Booth, Scott Duncan, Abbi McLeod, Mohamad Ghazi Droubi, James Njuguna
First page: 98
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
The auxetic sandwich panels for structures have been designed to provide impact protection. The aim of this work is to modify an auxetic (re-entrant) honeycomb cell to reduce the stress concentrations within the cell structure, and further enhancement of this design. The auxetic structure was filled to achieve a greater energy absorbance and enhance safety applications. Analytical and elastic three-dimensional finite element approaches were used to investigate the structural strength performance. The basic model (i.e. modified re-entrant strut cell design) consisted of the honeycomb auxetic polypropylene (PP) structure sandwiched between two steel plates (known as safety panels) which were placed under static compression loading. The cell geometry and size were then modified to reduce the stress concentration zones. The structure cells were filled with silly putty and polyvinyl chloride (PVC) foam. The effect of the filling the cells on the stress concentration and energy absorbance were analysed using elastic stress and deformation analysis methods. During the stress path analysis, it was found that an increase in Young’s modulus of the filling was directly proportional to a decrease in internal stresses. It was concluded that while filling the basic model with soft materials reduced the stress concentration, but it led to a reduction in the energy absorbance capability. Further on, the lower stress produced by the enhanced could be useful to prevent significant penetration of the protective panel. Compared to similar structures of steel, auxetic foam panels have the advantage of having only a fraction of the weight and being corrosion resistant at the same time as keeping impact strength.Graphical abstract
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-03-09T11:42:55Z
DOI: 10.1177/03093247221083210
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- Hole-drilling method eccentricity error correction using a convolutional
neural network-
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Authors: Jun Wu, Bin Qiang, Xiaoxuan Liao, Yanmei Huang, Changrong Yao, Yadong Li
First page: 118
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Hole eccentricity is an important error source when residual stress is measured via the hole-drilling method. The conventional ways to correct eccentricity error for hole-drilling residual stress measurement rely on complicated mathematical processes and are difficult to use. To overcome this shortcoming, this paper proposes a method that uses a convolutional neural network to correct for the hole-drilling method eccentricity error. First, the hole-drilling method measurement process in uniform biaxial stress field is simulated via the finite element method. The influence of the eccentric distance, eccentric angle, and stress ratio on the strain measurement error is discussed. Then, a convolutional neural network is trained using simulated data and the hole-drilling method strain measurement error is predicted for arbitrary eccentricity conditions. Finally, the residual stress is corrected by introducing the strain error into its equation. The simulated residual stresses of ten eccentric measurement points in predefined stress fields are corrected using this procedure to conducted numerical tests. The maximum error of simulated stresses decreased from 30.46% to −4.67% after correction. Therefore, the hole eccentricity has a significant influence on the residual stress measurement accuracy of hole-drilling method. The proposed correction method can effectively eliminate this error.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-02-22T11:31:35Z
DOI: 10.1177/03093247221080013
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- Optimal shaft-hub connections
-
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Authors: Niels Leergaard Pedersen
First page: 130
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
In all power transmitting machines the shaft-hub connection has a large impact on the overall machine size, if the strength can be increased we can reduce the size. The connection between shaft and hub is a machine element with many possible designs available and described in standards. The connection can be either permanent or changeable, the goal is in all cases to have as high a strength for the connection as possible. Focus is in the present paper on the connections with easy assembly and disassembly, that is, on positive connections (geometrically locked). The designs specified in standards are traditionally made with straight lines and circular arches. Alternatively the involute spline can be used. For this case the cutting tool shape is made with straight lines and circular arches. Present standard designs are not made with minimum stress concentrations as the main objective, other features as for example, easy manufacturing has the primary importance. In the present paper we show how the involute spline design can be significantly improved in relation to strength maximization by reducing the maximum stress. The maximum stress can in many cases be reduced by more than [math] relative to standard design.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-03-09T01:18:41Z
DOI: 10.1177/03093247221080016
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- Non-contact strain measurement to eliminate strain gages in
vibration-based high cycle fatigue testing-
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Authors: Benjamin D Hill, Brandon A Furman, Emma E German, Jacob R Rigby, Ryan B Berke
First page: 141
Abstract: The Journal of Strain Analysis for Engineering Design, Ahead of Print.
Digital Image Correlation (DIC) is a non-contacting, camera-based technique that calculates full-field displacements and strains by comparing digital images taken before and after an object is deformed. During a vibration-based fatigue test, DIC has an advantage over strain gages in that it is non-contacting and does not accumulate damage during the test. In this work, DIC was implemented to build strain-velocity calibration curves as an alternative to strain gages. First, a curve fit was applied to DIC displacements and strains along the free edge of the plate using an approximate solution for the mode shape of a cantilevered plate. In total, the curve fits were applied to three sets of DIC data: (i) the raw strains calculated with DIC; (ii) the in-plane U-displacements from which the raw DIC strains were computed; and (iii) the out-of-plane W-displacements observed in the direction of motion. Second, classical plate theory was used to calculate strains by taking derivatives of each of the applied curve fits. Third, the peak strains from each curve fit were used to build the strain-velocity calibration curves. Further, a Monte Carlo Method uncertainty analysis was performed to estimate the uncertainty of the curve fitted DIC and strain gage measurements. Of the three curve-fits, the DIC strains derived from the out-of-plane displacements provided the most precise measurements relative to a strain gage at all excitation levels used to build the calibration curves.
Citation: The Journal of Strain Analysis for Engineering Design
PubDate: 2022-02-09T09:28:50Z
DOI: 10.1177/03093247221076765
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