Showing papers in "Mechanics of Materials in 2018"

TL;DR: In this paper, a comprehensive combined hybrid numerical-experimental program is executed on three advanced high strength steels (DP980, CP980 and CP1180) with the objective of validating the hypothesis of a positive strain rate effect on the ductility under biaxial tension, as well as the Hosford-Coulomb model assumptions with regards to the Lode parameter and stress triaxiality dependency of fracture initiation.

TL;DR: In this paper, an iterative FE simulation of the penetration of a spherical indenter into a sample, with automated convergence on a best-fit set of parameter values characterizing the yielding and work hardening response of the material (in a constitutive law).

TL;DR: In this paper, anisotropic closed-cell PU foams with different densities were tested in compression along the rising and the perpendicular directions to determine the mechanical properties (elastic modulus and plateau stress).

TL;DR: In this paper, a multiscale method is defined in which CNTs' structure and interfacial phase are studied in a nanoscale model and CNT's distribution, curvature, and aggregation are investigated in a microscale model.

TL;DR: In this article, the propagation of plane waves in porous thermoelastic medium is considered in the context of dual-phase-lag model of generalized thermo-elasticity, and the fundamental solution of the system of differential equations in case of steady oscillations in terms of the elementary functions has been constructed.

TL;DR: In this paper, the authors investigate quasi-static indentation behavior of fiber reinforced hybrid composites in order to develop basic understanding of low velocity impact events and explore energy absorption, and load carrying capacity incorporating two and three different combinations of fibers.

TL;DR: In this article, dual-straining by constrained groove pressing (CGP) and cold rolling (CR) under different routes (direct cold rolling and cross cold rolling) performed on Al-Mn-Si sheets was revealed to be more influential in ultimate grain refinement and strength enhancement.

TL;DR: In this article, the authors applied Visco-SCRAM and hot spot models to predict the ignition of HMX-based polymer bonded explosives (PBXs) under low velocity impact.

TL;DR: In this paper, the effect of aspect ratio (AR) on the deformation behavior of 17 vol% SiCp/2009Al composite plates was investigated by using microscale finite element (FE) models.

TL;DR: In this article, a series of dynamic compression tests on Ti-55511 alloy have been performed at constant strain rates ranging from 350 s−1 to 2900 s− 1 by means of split Hopkinson pressure bar technique at room temperature.

TL;DR: In this paper, the deformation characteristics and mechanical behavior of closed-cell polylactide (PLA) foams under quasi-static uniaxial compression were investigated.

TL;DR: In this paper, a piecewise function model was proposed to describe the constitutive equations of AZ91 magnesium alloy of stress-strain curves, and new methods to obtain the material constants k, C1 and C2 were proposed to predict accurately the flow stress corresponding within the range of strain from peak values to end based on the phenomenological representation of stress curve in the second stage.

TL;DR: In this paper, the authors developed a unifying energy approach for rapid assessment of fatigue parameters in high-cycle fatigue regime, where energy dissipation was considered as an index of fatigue damage to analyze the progressive microstructural movements and to evaluate the fatigue behavior of low-carbon steel.

TL;DR: In this article, the authors investigated the dynamic behaviors of granite under combined compression/shear loading by the modified split Hopkins on pressure bar device (SHPB) and found that the heterogeneity is loading-rate dependent and/or shear component dependent.

TL;DR: In this article, a hybrid strategy for modeling intergranular hydrogen embrittlement in polycrystalline microstructures is proposed, which is based on a grain-boundary integral representation of the micro-mechanics, numerically solved by the boundary element method.

TL;DR: In this paper, the Hashin and Puck failure theories are recommended for multidirectional flax fiber composite laminates, and they have the smallest error compared to experimental data.

TL;DR: In this paper, a general numerical scheme for the fractional plastic flow rule, dedicated to a wide class of materials manifesting the nonnormality of plastic flow and induced plastic anisotropy, is presented.

TL;DR: In this paper, the deformation response of closed-cell rigid polymeric form is explored at different length scales using ultra-high speed photography in conjunction with digital image correlation (DIC) in order to understand the contribution of the strength and modulus of parent polymer material in the cellular scale deformation and failure response of the specimen.

TL;DR: In this article, a physics-based reduced-order model was developed to study aspects related to the dynamic and nonlinear response of tense-grity-based structures with very few degrees of freedom, capturing their buckling and post-buckling behavior as well as their dynamic response.

TL;DR: In this article, a theoretical model of a thin piezoelectric film bonded to a graded substrate under an in-plane electrical loading is established, in which the shear modulus of the graded substrate is assumed to vary exponentially in the thickness direction.

TL;DR: In this article, a physics-motivated model for strain hardening/softening describing the consequences of the competition operating between hardening (gliding) and softening due to dynamic recovery (DRC) and dynamic recrystallization (DRX) mechanisms is proposed.

TL;DR: In this paper, the elasto-plastic properties of hard coatings such as (Cr,Al)N deposited by the combination of the direct current magnetron sputtering (dcMS) and the high power pulsed magnetron stuttering (HPPMS) method are studied by means of a numerical modeling approach.

TL;DR: In this paper, the authors present patterns for various types of deformation relief formed by octahedral slip, ways of its self-organization and its ability for stress relaxation.

TL;DR: In this paper, a multiscale and multiphysics approach was proposed to identify the local evolution of the materials parameter of the hygro-mechanical behavior law of a neat PA6 polymer, occurring during the transient stage of humid aging tests, from the numerical simulation of the dimensional change experienced by macroscopic samples.

TL;DR: In this article, the authors proposed a stability framework based on a linear perturbation analysis to determine the onset of unstable crack growth in a phase field model with a general degradation function.

TL;DR: In this paper, the authors investigated the energy dissipation and void collapse in graded nanoporous nickel by non-equilibrium molecular dynamics simulations and found that void size gradient influences the time history path of the energy disipation.

TL;DR: In this article, the effects of orientation and volume fraction of carbon fiber, volume fraction, stiffness and thickness of the interphase region created due to non-boned interaction between the CNT and polymer matrix on the elastic response of the FFRCs are studied.

TL;DR: In this paper, a micromechanical model is constructed to describe the grain size dependent super-elasticity degeneration of polycrystalline NiTi SMAs, where each grain-interior (GI) phase is assumed to be a spherical inclusion embedded in a matrix of grain-boundary (GB) phase.

TL;DR: In this article, a thermoviscoelastic constitutive model incorporating uncoupled structure and stress relaxation is proposed to capture the material behavior for thermally induced amorphous shape memory polymers.

TL;DR: In this article, a new approach combining three models is developed to evaluate the thermomechanical behavior of carbon nanotube-fiber reinforced metal matrix nanocomposites (CNT-FRMMCs).