Showing papers in "Mechanics of Materials in 2021"

TL;DR: In this paper, the nanoindentation approach with the Berkovich type of indenter was used to evaluate the stress-strain relationships of the sintered AgNP material at different strain rates.

TL;DR: In this article, a generic analytical framework is proposed to obtain the dynamic elastic moduli of lattice materials under steady-state vibration conditions, where the dynamic deformation behavior of the individual beam elements of a lattice is distinct from the behaviour under a static condition.

TL;DR: In this paper, a new concept of 3D auxetic lattice structures with high stiffness is proposed, and a feasible method for rapidly fabricating the proposed structures with a high-performance continuous carbon fiber reinforced polymer (CFRP) composite is exploited.

TL;DR: In this paper, the anisotropic mechanical response triggered by specific microstructures encountered in wire-plus-arc additively manufactured 316L stainless steels is analyzed and a volume element is generated, with an internal geometry that is based on an average periodic fusion zone shape.

TL;DR: In this paper, the authors used elasticity theory to calculate the low-strain shear modulus of open-cell foam from Young's modulus and Poisson's ratio measured in compression tests.

TL;DR: In this paper, different parameters such as materials characteristics and processing parameters are investigated and optimally selected for composite fabrication and the purpose of selecting the optimal parameters and fabricating different types of composite samples was to achieve simultaneous and high improvement in various mechanical properties of epoxy resin.

TL;DR: In this article, a methodology for the construction of effective strain gradient media for heterogeneous materials is proposed, combining a variational principle in linear elasticity with the extended Hill lemma accounting for the generalized kinematics in the framework of periodic homogenization.

TL;DR: In this paper, a two-phase local/nonlocal elasticity was used to study the size-dependent dynamic stability and damping vibration of Viscoelastic Functionally Graded Porous (VFGP) Timoshenko nanobeams incorporating surface effects.

TL;DR: In this paper, a multiscale modeling strategy is used to quantify factors governing the temperature rise in hot spots formed by pore collapse from supported and unsupported shock waves in the high explosive HMX (octahydro-1,3,5,7-tetranitro- 1.3, 5,7,7tetrazocine).

TL;DR: In this paper, a general approach for the multi-scale design of variable stiffness composites (VSCs) is presented, where the first-level problem of the multiscale two-level optimisation strategy (MS2LOS) is solved to determine the optimal distribution of the VSC stiffness properties at the macroscopic scale satisfying the requirements of the problem at hand.

TL;DR: In this article, the authors investigate dissipative effects involved during the detachment of a smooth spherical glass probe from a viscoelastic silicone substrate patterned with micro-asperities.

TL;DR: In this paper, the plastic deformation mechanism of c-plane (0001) sapphire under nanoindentation was simulated using the molecular dynamics (MD) method, and the relationship between the surface morphology of the nano-indented c-planar SApphire and the activation process of slip systems was studied.

TL;DR: In this article, a homogenization methodology for the construction of effective Cosserat substitution media for heterogeneous materials is proposed, combining a variational principle in linear elasticity with the extended Hill-Mandel lemma accounting for the introduced generalized kinematics.

TL;DR: In this article, a novel S-shaped unit cell based auxetic structure is hybridized with star re-entrant unit cells and analyzed both numerically and experimentally based on physical forms produced by selective laser melting as part of the research reported here.

TL;DR: In this paper, the authors take an extensive look at the role that the principles of causality and passivity have played in various areas of physics and engineering, including in the modern field of metamaterials.

TL;DR: In this article, it was shown that if the network with only regular covalent bonds is immiscible with each other, a hybrid network can be synthesized with a low molar ratio of dynamic covalents, which still maintains its reprocessing and self-healing capabilities.

TL;DR: In this article, the mesoscale continuum damage model for laminated composites is extended for fatigue life and residual strength predictions by means of the LaRC04 failure criteria, but a new set of functions are introduced to account for the degradation of the material under fatigue loads.

TL;DR: In this article, various experimental methods are investigated to characterize strain hardening behaviors up to large deformation under different stress states for an aluminium alloy sheet of AA5182-O. Strain hardening is obtained by both analytical computation and an inverse engineering approach under different loading conditions of shear, uniaxial tension, plane strain tension and equibiaxial tensile tension.

TL;DR: In this paper, a strain gradient cyclic plasticity model was developed to simulate and analyze the characteristic kinematic hardening behavior of gradient-structured (GS) metals, and a back stress model was established to describe the cyclic deformation properties of GS materials.

TL;DR: In this article, a comparative study of different methods, such as the analytical method, finite element method (FEM), and multilayer perceptron (MLP), for analyzing a frictionless receding contact problem was presented.

TL;DR: In this article, the intrinsic dissipation terms in the entropy production equation are discussed and their implications on measuring fracture fatigue entropy in metals are discussed, and a technique to identify the fatigue limit of metals by measuring their damping value at different stress levels is introduced.

TL;DR: In this article, a crystal plasticity finite-element model was used to investigate the influence of both temperature and strain rate on the deformation behavior of β-Sn in SAC305 solder via the representative volume element.

TL;DR: In this paper, grain size and grains exhibiting hot cracks of laser powder bed fusion (LPBF) processed Hastelloy X as-built parts under two scanning strategies have been characterized using electron back scattered diffraction (EBSD) technique.

TL;DR: In this article, a coupled computational model is presented to account for intralaminar damage using the mesoscale continuum damage mechanics (CDM) model and interlaminar damage using a cohesive zone model (CZM).

TL;DR: In this paper, the shape analysis of purely compressed shells with the help of finite element apparatus has been studied, where the main difficulty is represented by the fulfillment of the concavity constraint for the stress potential.

TL;DR: In this article, a constitutive theory that couples large, viscoplastic deformations to the insertion and extraction of lithium in amorphous electrode materials is proposed, which relies on the concept of Shear Transformation Zone as carrier of plastic flow in the material, and accounts for microstructural evolution via an internal "free volume" variable.

TL;DR: In this article, a nonlinear viscoelastic constitutive model for polyurea is developed, which is correlated with the interaction of chain segments, the stretch of molecular chains and covalent bonds from the perspective of molecular structure.

TL;DR: In this article, a micromechanical approach is adopted to provide a better understanding of the existing links between the constitutive phase behaviors and the local damage, and the macroscopic mechanical behavior of these materials.

TL;DR: In this article, a new class of chiral metamaterials based on uniform Euclidean tessellations and their dual counterparts was proposed and analyzed using finite element analysis under periodic boundary conditions.

TL;DR: In this paper, the elasticity-based locally exact asymptotic homogenization theory is extended to accommodate non-ageing linearly viscoelastic composites under antiplane shear loading.