Subjects -> MANUFACTURING AND TECHNOLOGY (Total: 363 journals)
    - CERAMICS, GLASS AND POTTERY (31 journals)
    - MACHINERY (34 journals)
    - MANUFACTURING AND TECHNOLOGY (223 journals)
    - METROLOGY AND STANDARDIZATION (6 journals)
    - PACKAGING (19 journals)
    - PAINTS AND PROTECTIVE COATINGS (4 journals)
    - PLASTICS (42 journals)
    - RUBBER (4 journals)

MACHINERY (34 journals)

Showing 1 - 27 of 27 Journals sorted alphabetically
Acta Mechanica Solida Sinica     Hybrid Journal   (Followers: 8)
Advanced Energy Materials     Hybrid Journal   (Followers: 31)
Applied Mechanics Reviews     Full-text available via subscription   (Followers: 27)
CORROSION     Full-text available via subscription   (Followers: 20)
Electric Power Components and Systems     Hybrid Journal   (Followers: 7)
Foundations and Trends® in Electronic Design Automation     Full-text available via subscription   (Followers: 1)
International Journal of Machine Tools and Manufacture     Hybrid Journal   (Followers: 8)
International Journal of Machining and Machinability of Materials     Hybrid Journal   (Followers: 4)
International Journal of Manufacturing Technology and Management     Hybrid Journal   (Followers: 8)
International Journal of Precision Technology     Hybrid Journal   (Followers: 1)
International Journal of Rapid Manufacturing     Hybrid Journal   (Followers: 3)
International Journal of Rotating Machinery     Open Access   (Followers: 2)
Journal of Machinery Manufacture and Reliability     Hybrid Journal   (Followers: 2)
Journal of Manufacturing and Materials Processing     Open Access  
Journal of Mechanics     Hybrid Journal   (Followers: 9)
Journal of Strain Analysis for Engineering Design     Hybrid Journal   (Followers: 5)
Journal of Terramechanics     Hybrid Journal   (Followers: 4)
Machine Design     Partially Free   (Followers: 183)
Machine Learning and Knowledge Extraction     Open Access   (Followers: 12)
Machines     Open Access   (Followers: 4)
Materials     Open Access   (Followers: 4)
Mechanics Based Design of Structures and Machines: An International Journal     Hybrid Journal   (Followers: 8)
Micromachines     Open Access   (Followers: 2)
Pump Industry Analyst     Full-text available via subscription   (Followers: 1)
Russian Engineering Research     Hybrid Journal  
Sensor Review     Hybrid Journal   (Followers: 2)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 6)
Similar Journals
Journal Cover
Journal of Mechanics
Journal Prestige (SJR): 0.303
Citation Impact (citeScore): 1
Number of Followers: 9  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1727-7191 - ISSN (Online) 1811-8216
Published by Oxford University Press Homepage  [419 journals]
  • Numerical study of hydrodynamic herringbone-grooved journal bearings
           combined with thrust bearings considering thermal effects

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      Authors: Wang C; Lin J.
      Pages: 13 - 21
      Abstract: AbstractHydrodynamic herringbone-grooved journal bearings (HGJBs) are analyzed by solving Navier–Stokes and energy equations. It is well known that the load capacity of hydrodynamic bearings may be affected by high temperatures and low oil viscosity. Therefore, the main objective of this study is to understand the pressure distribution of hydrodynamic HGJBs under different oil viscosity and eccentricity ratios. In this paper, 3 different configurations are studied, namely, a HGJB, a combined HGJB and thrust bearing, and a combined HGJB and grooved thrust bearing. The bearing characteristics, such as load capacity and attitude angle that vary with different eccentricity ratios, are also discussed. The results show that the load capacity of the bearing decreases with increasing temperature. The pressure difference also increases as the eccentricity ratio increases. The high-pressure region is concentrated at the tip of the groove for the HGJB. In addition, the combined HGJB and grooved thrust bearing can be used to stabilize the journal because of the low attitude angle. These findings may help and facilitate the design of hydrodynamic bearings suitable for working in warm and hot environments in the future.
      PubDate: Wed, 23 Mar 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufab036
      Issue No: Vol. 38 (2022)
       
  • Research on performance optimization of gas–liquid ejector in multiphase
           mixed transportation device

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      Authors: Zhao J; Wei X, Zou J, et al.
      Pages: 22 - 31
      Abstract: ABSTRACTIn the process of oil and gas extraction, a system that uses a pump and reversing mechanism to achieve high-efficiency export of gas–liquid mixture is devised. A gas–liquid ejector is fitted in the front of the device to boost pressure inside the tank in order to store more gas in the tank under a given volume. To meet the working conditions of gas–liquid high-efficiency transport device and obtain a larger outlet pressure and better ejection performance, this paper investigates the effect of outlet pressure, ratio of throat inlet area to nozzle outlet area and nozzle contraction angle on the ejection performance of gas–liquid ejector, and simulations using the computational fluid dynamics approach. At the same time, an experiment platform is built for testing. The research findings show that the ejection gas flow rate and ejection ratio of gas–liquid ejector decrease with the increase of the outlet pressure; as the ratio of throat inlet area to nozzle outlet area increases, the ejection gas flow rate and the ejection ratio of gas–liquid ejector increase first and then decrease. Different nozzle diameters correspond to different optimal area ratios; under the specified working parameters, with the increase of the nozzle contraction angle, the ejection gas flow rate and injection ratio of the gas–liquid ejector increase first and then decrease, and there is an optimal nozzle contraction angle.
      PubDate: Wed, 23 Mar 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac001
      Issue No: Vol. 38 (2022)
       
  • Cost-effective and accurate interlaminar stress modeling of composite
           Kirchhoff plates via immersed isogeometric analysis and equilibrium

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      Authors: Patton A; Carraturo M, Auricchio F, et al.
      Pages: 32 - 43
      Abstract: AbstractThe interest for composites has constantly grown in recent years, especially in the aerospace and automotive industries, as they can be moulded in complex form and geometry, as well as exhibit enhanced engineering properties. Nevertheless, despite the accelerated diffusion of laminated composites, the design of these materials is often restrained by the lack of cost-effective modeling techniques. In fact, the existing numerical strategies allowing for cheap simulations of laminated structures usually fail to directly capture out-of-plane through-the-thickness stresses, which are typically responsible for failure modes such as delamination. In this context, a stress recovery approach based on equilibrium has been recently shown to be an efficient modeling strategy in the framework of isogeometric analysis. Since immersed approaches like the finite cell method have been proven to be a viable alternative to mesh-conforming discretization for dealing with complex/dirty geometries as well as trimmed surfaces, we herein propose to extend the stress recovery approach combining the finite cell method, isogeometric analysis and equilibrium to model the out-of-plane behavior of Kirchhoff laminated plates. Extensive numerical tests showcase the effectiveness of the proposed approach.
      PubDate: Wed, 23 Mar 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac005
      Issue No: Vol. 38 (2022)
       
  • Modeling intracellular transport and traffic jam in 3D neurons using
           PDE-constrained optimization

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      Authors: Li A; Zhang Y.
      Pages: 44 - 59
      Abstract: AbstractThe intracellular transport process plays an important role in delivering essential materials throughout branched geometries of neurons for their survival and function. Many neurodegenerative diseases have been associated with the disruption of transport. Therefore, it is essential to study how neurons control the transport process to localize materials to necessary locations. Here, we develop a novel optimization model to simulate the traffic regulation mechanism of material transport in three-dimensional complex geometries of neurons. The transport is controlled to avoid traffic jams of materials by minimizing a predefined objective function. The optimization subjects to a set of partial differential equation (PDE) constraints that describe the material transport process based on a macroscopic molecular-motor-assisted transport model of intracellular particles. The proposed PDE-constrained optimization model is solved in complex tree structures by using the isogeometric analysis. Different simulation parameters are used to introduce traffic jams and study how neurons handle the transport issue. Specifically, we successfully model and explain the traffic jam caused by the reduced number of microtubules (MTs) and MT swirls. In summary, our model effectively simulates the material transport process in healthy neurons and also explains the formation of a traffic jam in abnormal neurons. Our results demonstrate that both geometry and MT structure play important roles in achieving an optimal transport process in neurons.
      PubDate: Wed, 23 Mar 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac007
      Issue No: Vol. 38 (2022)
       
  • An accurate strategy for computing reaction forces and fluxes on trimmed
           locally refined meshes

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      Authors: D’Angella D; Kollmannsberger S, Reali A, et al.
      Pages: 60 - 76
      Abstract: AbstractThe finite element method is classically based on nodal Lagrange basis functions defined on conforming meshes. In this context, total reaction forces are commonly computed from the so-called “nodal forces”, yielding higher accuracy and convergence rates than reactions obtained from the differentiated primal solution (“direct” method). The finite cell method and isogeometric analysis promise to improve the interoperability of computer-aided design and computer-aided engineering, enabling a direct approach to the numerical simulation of trimmed geometries. However, body-unfitted meshes preclude the use of classic nodal reaction algorithms. This work shows that the direct method can perform particularly poorly for immersed methods. Instead, conservative reactions can be obtained from equilibrium expressions given by the weak problem formulation, yielding superior accuracy and convergence rates typical of nodal reactions. This approach is also extended to non-interpolatory basis functions, such as the (truncated) hierarchical B-splines.
      PubDate: Fri, 01 Apr 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac006
      Issue No: Vol. 38 (2022)
       
  • Computational flow analysis with boundary layer and contact
           representation: I. Tire aerodynamics with road contact

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      Authors: Kuraishi T; Terahara T, Takizawa K, et al.
      Pages: 77 - 87
      Abstract: AbstractIn computational flow analysis with moving solid surfaces and contact between the solid surfaces, it is a challenge to represent the boundary layers with an accuracy attributed to moving-mesh methods and to represent the contact without leaving a mesh protection gap. The space-time topology change (ST-TC) method, introduced in 2013, makes moving-mesh computation possible even when we have contact between moving solid surfaces or other kinds of flow-domain TC. The contact is represented without giving up on high-resolution flow representation near the moving surfaces. With the ST-TC and other ST computational methods introduced before and after, it has been possible to address many of the challenges encountered in conducting this class of flow analysis in the presence of additional complexities such as geometric complexity, rotation or deformation of the solid surfaces and the multiscale nature of the flow. In this first part of a two-part article, we provide an overview of the methods that made all that possible. We also provide an overview of the computations performed for tire aerodynamics with challenges that include the complexity of a near-actual tire geometry with grooves, road contact, tire deformation and rotation, road roughness and fluid films.
      PubDate: Fri, 01 Apr 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac009
      Issue No: Vol. 38 (2022)
       
  • Scattering of a scalene trapezoidal hill with a shallow cavity to SH waves

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      Authors: Sun Y; Yang Z, Chen L, et al.
      Pages: 88 - 111
      Abstract: AbstractBoth surface ground motion and cavity stress concentration have always been considered in the designs of earthquake engineering. In this paper, a theoretical approach is used to study the scattering problem of circular holes under a scalene trapezoidal hill. The wave displacement function was obtained by solving the Helmholtz equation that meets the zero-stress boundary conditions by the variable separation method and the image method. Based on the complex function, the multipolar coordinate method and the region-matching technique, algebraic equations were established at auxiliary boundaries and free boundary conditions in the complex domain. Auxiliary circles were used to solve the singularity of the reflex angle at the trapezoidal corner. Then, according to the sample statistics, instead of the Fourier expansion method, the least-squares method was used to solve the undetermined coefficient of the algebraic equations by discrete boundaries. Frequency responses for some parameters were calculated and discussed. The numerical results demonstrate that the continuity of the auxiliary boundaries and the accuracy of the zero-stress boundary are good; the displacement of the free surface and the stress of the circular hole are related to the shape of the trapezoid, the position of the circular hole, the direction of the incident wave and the frequency content of the excitation. Finally, time-domain responses were calculated by inverse fast Fourier transform based on the frequency domain theory, and the results have revealed the wave propagation mechanism in the complicated structure.
      PubDate: Fri, 01 Apr 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac010
      Issue No: Vol. 38 (2022)
       
  • Weight functions for an array of collinear cracks in an infinite
           anisotropic elastic plate

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      Authors: Wu K; Chen S.
      Pages: 112 - 116
      Abstract: AbstractWeight functions are provided for calculating the stress intensity factors for collinear cracks in an infinite anisotropic elastic plate. The number of cracks as well as the length of the cracks are arbitrary. The weight functions are for crack-face loading, which may be non-self-equilibrium. It is shown that for self-equilibrium loading, the weight functions are independent of elastic constants. For non-self-equilibrium loading, however, an additional constant term that is material-dependent appears.
      PubDate: Fri, 01 Apr 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac011
      Issue No: Vol. 38 (2022)
       
  • Experimental study on erosion and wear law of metal screen under spraying
           condition

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      Authors: Ying R; Zhao X, Shi B, et al.
      Pages: 117 - 127
      Abstract: ABSTRACTIt is very important for the safe production of sand producing oil and gas wells to make clear the erosion law of sand control screen pipe. The experiment of erosion law of metal mesh under two working conditions of blockage and non-blockage was carried out with jet erosion experimental device. The influencing factor of solid mass fraction (0.3%, 0.5%, and 0.8%), aperture velocity (1.5 m/s, 4 m/s, and 6 m/s) and particle size (20 μm, 54 μm, and 74 μm) on the erosion rate of metal mesh was analyzed. The results show that the mass loss of screen increases with the increase of solid mass fraction, aperture velocity and particle size, and the change law of single and double screens is consistent; under the condition of incomplete blockage, the mass loss of screen increases exponentially with the flow rate; under the condition of complete blockage, the balance flow rate of screen decreases with the increase of pressure difference when the pressure difference between inlet and outlet of screen is kept constant. In addition, the mass loss increases with the increase of pressure difference; in addition, the scanning electron microscope results of the erosion screen show that the erosion wear of the screen under the non-blocking condition is much less than that under the blocking condition, which is because the gap between the weft wires of the screen is blocked by particles, resulting in the rapid increase of the local aperture velocity of the screen, thus accelerating the local erosion wear of the screen.
      PubDate: Fri, 01 Apr 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac004
      Issue No: Vol. 38 (2022)
       
  • Quadrilateral layout generation and optimization using equivalence classes
           of integral curves: theory and application to surfaces with boundaries

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      Authors: Shepherd K; Gu X, Hiemstra R, et al.
      Pages: 128 - 155
      Abstract: AbstractExtracting quadrilateral layouts from surface triangulations is an important step in texture mapping, semi-structured quadrilateral meshing for traditional analysis and spline reconstruction for isogeometric analysis. Current methods struggle to yield high-quality layouts with appropriate connectivity between singular nodes (known as “extraordinary points” for spline representations) without resorting to either mixed-integer optimization or manual constraint prescription. The first of these is computationally expensive and comes with no guarantees, while the second is laborious and error-prone. In this work, we rigorously characterize curves in a quadrilateral layout up to homotopy type and use this information to quickly define high-quality connectivity constraints between singular nodes. The mathematical theory is accompanied by appropriate computational algorithms. The efficacy of the proposed method is demonstrated in generating quadrilateral layouts on the United States Army’s DEVCOM Generic Hull vehicle and parts of a bilinear quadrilateral finite element mesh (with some linear triangles) of a 1996 Dodge Neon.
      PubDate: Wed, 13 Apr 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac002
      Issue No: Vol. 38 (2022)
       
  • Penalty coupling of trimmed isogeometric Kirchhoff–Love shell
           patches

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      Authors: Proserpio D; Kiendl J.
      Pages: 156 - 165
      Abstract: AbstractWe present a formulation for isogeometric Kirchhoff–Love shell analysis on complex CAD models consisting of multiple trimmed patches. The method is based on the penalty coupling method presented in Herrema AJ, Johnson EL, Proserpio D, Wu MCH, Kiendl J, Hsu MC (Penalty coupling of non-matching isogeometric Kirchhoff–Love shell patches with application to composite wind turbine blades. Computer Methods in Applied Mechanics and Engineering 2019;346:810–840.) and extended to the application on arbitrary coupling curves defined either in the physical or parametric space. We present the detailed formulation ready for implementation. Different numerical tests demonstrate the accuracy and applicability of the method.
      PubDate: Wed, 20 Apr 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac008
      Issue No: Vol. 38 (2022)
       
  • Realization and optimization of a binary cycle power generating system
           using a low-grade heat source

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      Authors: Yang W; Hou P, Shih W, et al.
      Pages: 166 - 175
      Abstract: AbstractThe low-grade heat source thermoelectric system generates electricity using a working fluid at temperature lower than 100°C or gas at temperature lower than 250°C. The system is usually composed of binary (1 + 0.5 × 2) cycles. Positive net output power or high efficiency of the system can only be feasible after optimization. Most works focused on the cycle of working fluid and treated the power consumptions of the other cycles as constants. However, both cycles should be comprehensively considered in optimization, especially when power consumptions vary with working conditions. This research selected an organic Rankine cycle thermoelectric system for demonstration. A thermodynamic model conforming to the target system was built. The temperature of the heat source and the pressure at expander inlet were tailored using the genetic algorithm. The best efficiency is 1.89%, and the largest net output power is 5.80 kW. Both results are better than those (efficiency = 1.59% and net output power = 5.34 kW) from benchmarks under the highest temperature of heat source and inlet pressure among possible working conditions. Experimental results are provided for both validation of the model and confirmation of the superiority of optimization results.
      PubDate: Mon, 25 Apr 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac014
      Issue No: Vol. 38 (2022)
       
  • Study of shear locking effect on 3D solder joint reliability analysis

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      Authors: Huang Y; Chiang K.
      Pages: 176 - 184
      Abstract: AbstractThe fabrication process of WLP (wafer-level packaging) has become more mature, and using the finite element method (FEM) to predict the reliability life of electronic packaging can shorten the WLP design cycles. This study adopted the NSMD (non-solder mask defined) solder joint structure in WLP and used an energy method to predict the solder joint geometry. A fixed mesh size will be determined for the critical region of the solder joint to evaluate the inelastic strain due to the thermal loading in finite element analysis. However, under the influence of the solder geometry of some tested vehicles, especially when the solder contact angle of the lower pad is less than 20 degrees, a shear locking phenomenon will occur at the solder joint. This phenomenon causes abnormal energy transfer. The excessive strain is concentrated on the upper part of the solder joint, resulting in an incorrect estimation of reliability life. Reduced integration can prevent shear locking and has improved strain results compared to full integration. The results of this research demonstrate that the FEM using proper mesh size control and the reduced integration point element in critical regions can deliver accurate reliability life prediction for WLP.
      PubDate: Fri, 29 Apr 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac012
      Issue No: Vol. 38 (2022)
       
  • Computational flow analysis with boundary layer and contact
           representation: II. Heart valve flow with leaflet contact

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      Authors: Terahara T; Kuraishi T, Takizawa K, et al.
      Pages: 185 - 194
      Abstract: AbstractIn this second part of a two-part article, we provide an overview of the heart valve flow analyses conducted with boundary layer and contact representation, made possible with the space–time (ST) computational methods described in the first part. With these ST methods, we are able to represent the boundary layers near moving solid surfaces, including the valve leaflet surfaces, with the accuracy one gets from moving-mesh methods and without the need for leaving a mesh protection gap between the surfaces coming into contact. The challenge of representing the contact between the leaflets without giving up on high-resolution flow representation near the leaflet surfaces has been overcome. The other challenges that have been overcome include the complexities of a near-actual valve geometry, having in the computational model a left ventricle with an anatomically realistic motion and an aorta from CT scans and maintaining the flow stability at the inflow of the ventricle-valve-aorta sequence, where we have a traction boundary condition during part of the cardiac cycle.
      PubDate: Thu, 05 May 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufac013
      Issue No: Vol. 38 (2022)
       
  • The mechanical properties and fatigue responses of fiber metal
           nanocomposite laminates with double-edged cracks

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      Authors: Jen M; Hsu L, Liang Y, et al.
      Pages: 704 - 715
      Abstract: ABSTRACTThe fiber metal laminates (FMLs) of hybrid Ti/APC-2 neat and nanocomposite laminates were fabricated. Geometrically symmetric and anti-symmetric double-edged cracks were cut in FMLs. From tensile tests, we received the load vs. displacement curves, stress intensity factors of mixed mode and mechanical properties. From cyclic tests, the load vs. cycles (P–N) curves, residual life and failure mechanisms were obtained. The mechanical properties of symmetrically cracked specimens were slightly lower than those of anti-symmetrically cracked counterparts. As the crack length increases and inclination angle decreases, the fatigue life decreases. The enhancement of nanopowder improved the ultimate load and fatigue life. The local stress intensity at the crack tip dominates the fatigue responses. The piece of elliptical part was observed from cyclic tests at failure. Although the attraction of two crack tips accelerated the crack growth towards each other, the delay to failure was caused by two crack tips circling around and forming a small piece of ellipse centrally.
      PubDate: Wed, 05 Jan 2022 00:00:00 GMT
      DOI: 10.1093/jom/ufab034
      Issue No: Vol. 37 (2022)
       
 
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