JournalTOCs

Journal of Mechanics
Journal Prestige (SJR): 0.303

Citation Impact (citeScore): 1
Number of Followers: 9

Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1727-7191 - ISSN (Online) 1811-8216
Published by Oxford University Press

[425 journals]

Preface Recent advances in isogeometric analysis
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  Pages: 1 - 1
  Abstract: Isogeometric analysis (IGA) [1], a method originally proposed to directly use the same basis functions for the representation of geometry in computer-aided design and the approximation of solution fields in finite element analysis, is one of the most active research topics in computational mechanics, geometry, and mathematics. IGA has attracted a great deal of attention due to the improvements in solution quality that follow from incorporating smooth basis functions into analysis and the vision towards tighter integration of various aspects in computer-aided engineering and manufacturing. This special issue aims to present the latest research progress and developments in IGA and further expand the forefront of technological advancements in this field.
  PubDate: Fri, 20 Jan 2023 00:00:00 GMT
  DOI: 10.1093/jom/ufac051
  Issue No: Vol. 39 (2023)
A direct numerical simulation method for solid-solid collision and
coupling with fluid
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  Pages: 2 - 23
  Abstract: The collision between solids in fluid is common in engineering, but the numerical simulation method is less studied. A direct numerical simulation method combining the sharp interface immersed boundary method and the finite element method based on penalty function was established for solid–solid collision and coupling with fluid. The lubrication model for cylinder structures with and without fluid flow was developed using the data regression method. The partitioned coupling algorithm was used to realize the coupling solution between the fluid and solid domains. Four numerical examples were presented to demonstrate the validity of the established method. The numerical simulation of the vortex-induced collisions between two side-by-side cylinders showed the capabilities of the proposed method.
  PubDate: Tue, 07 Mar 2023 00:00:00 GMT
  DOI: 10.1093/jom/ufad001
  Issue No: Vol. 39 (2023)
Computational aerodynamics with isogeometric analysis
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  Pages: 24 - 39
  Abstract: The superior accuracy isogeometric analysis (IGA) brought to computations in fluid and solid mechanics has been yielding higher fidelity in computational aerodynamics. The increased accuracy we achieve with the IGA is in the flow solution, in representing the problem geometry, and, when we use the IGA basis functions also in time in a space–time (ST) framework, in representing the motion of solid surfaces. It is of course as part of a set of methods that the IGA has been very effective in computational aerodynamics, including complex-geometry aerodynamics. The set of methods we have been using can be categorized into those that serve as a core method, those that increase the accuracy, and those that widen the application range. The core methods are the residual-based variational multiscale (VMS), ST-VMS and arbitrary Lagrangian–Eulerian VMS methods. The IGA and ST-IGA are examples of the methods that increase the accuracy. The complex-geometry IGA mesh generation method is an example of the methods that widen the application range. The ST Topology Change method is another example of that. We provide an overview of these methods for IGA-based computational aerodynamics and present examples of the computations performed. In 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 represent the contact without leaving a mesh protection gap.
  PubDate: Thu, 09 Mar 2023 00:00:00 GMT
  DOI: 10.1093/jom/ufad002
  Issue No: Vol. 39 (2023)
Effects of material characteristics on thermal stress around an
equiangular polygonal hole in a thermoelectric material
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  Pages: 40 - 57
  Abstract: In this study, we conducted a theoretical analysis of thermal stress around an arbitrarily shaped hole in a thermoelectric material under electric current density and energy flux loading. Based on complex variable methods, conformal mapping, and analytical continuation theorem, the exact solutions of the thermal stress around a hole were obtained for the Seebeck coefficient and electric and heat conductivity. Based on the conversion efficiency equation of thermoelectric materials, higher electrical conductivity and lower heat conductivity should be selected to achieve an optimal design. The theoretical results indicated that higher electrical conductivity could reduce the thermal stress around the hole. However, energy flux and thermal stress concentration might be generated around the adiabatic hole due to the presence of a matrix with lower heat conductivity. Hence, thermoelectric materials with lower thermal conductivity should be selected carefully to avoid premature failure around the hole caused by thermal stress concentration. Finally, we also obtained and discussed the stress intensity factors of a hypocycloid-type crack.
  PubDate: Fri, 24 Mar 2023 00:00:00 GMT
  DOI: 10.1093/jom/ufad003
  Issue No: Vol. 39 (2023)
A stress disturbance barrier on a circular torque tube blocking the end
effects
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  Pages: 58 - 74
  Abstract: Knowing that the end effects arising from the end torsional loads will disturb the stress distribution in a torque tube, this paper develops a means of blocking the stress disturbances from the end where a torsional load is applied, such that the stress distributions of the Saint-Venant torsion can be maintained. The stress disturbance barrier (SDB) as an end effect shielding barrier is considered installed on an end of a circular toque tube whose material property can be with the cylindrical orthotropy. In general, the SDB is comprised of two layers: the front layer and the blocking layer. The front layer, which is optional and directly contacted with the external load, is for enhancing the durability, while the blocking layer situated between the front layer and the torque tube body is mainly for blocking the stress disturbances. The analysis is based on the state-space formalism, whose uncoupling feature on cylindrically orthotropic materials is beneficial for the further extension of the research. It is found that the parameters crucial to determine an effective SDB with a given thickness are the cylindrical orthotropy parameter and the longitudinal shear modulus. The approach of how to determine the proper material constants for having an effective SDB is clearly provided. As shown by the numerical results presented in the examples, an effective SDB of this research can fully block the stress disturbances from the external torsional loads that can be mathematically expanded by power series.
  PubDate: Wed, 12 Apr 2023 00:00:00 GMT
  DOI: 10.1093/jom/ufad004
  Issue No: Vol. 39 (2023)
Interaction behavior for multiple embedded cracks subjected to bending
load in creep regimes
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  Pages: 75 - 87
  Abstract: Multiple cracks growing from pre-existing defects during the manufacturing/installation process or from small cracks initiated are primary concerns in evaluating the structural integrity. In this study, the interaction behavior for coplanar multiple embedded cracks subjected to bending load in creep regimes was studied using numerical simulation approach. Influences of crack configurations (crack shape, crack depth, and crack distance) and creep properties on creep interaction factor and C* distribution along the embedded cracks were evaluated based on the three-dimensional finite element solutions. Due to the interaction among the multiple cracks, the C* distribution was asymmetric along the crack front and the C* values were pronounced as the cracks approached each other. Moreover, crack depth, crack distance, and creep exponent significantly affected the creep interaction factor and crack shape had limited influence. However, the maximum creep interaction factor did not coincide with the maximum C* values occurring along the crack front. The creep interaction factor determined by the average C* values along the crack front was employed to represent the intensity effect of multiple embedded cracks on the crack growth behavior. Finally, an empirical relation was proposed for estimating crack creep interaction factors of embedded cracks.
  PubDate: Thu, 11 May 2023 00:00:00 GMT
  DOI: 10.1093/jom/ufad005
  Issue No: Vol. 39 (2023)