Showing papers in "International Journal of Plasticity in 2017"

TL;DR: In this article, a dislocation density-based continuum plasticity model was proposed to investigate the strain hardening of a gradient interstitial-free steel by developing a dislocated density-and back stress model, in which the interaction of the component layers in the gradient structure was represented by incorporating geometrically necessary dislocations and back stress.

TL;DR: In this article, the authors analyzed the large strain compression response of different metamaterial architectures through finite element analysis and compression experiments on additively-manufactured stainless steel specimens, and showed that hollow rhombic dodecahedral mesostructures could provide nearly twice the strength and energy absorption of the conventional octet truss.

TL;DR: An elasto-plastic polycrystal plasticity model is developed and applied to an Inconel 718 (IN718) superalloy that was produced by additive manufacturing as mentioned in this paper.

TL;DR: In this article, a brittle/ductile multilayered composite was designed and fabricated by reaction annealing of pure Ti and Al foils, and comprised alternating α-Ti(Al) layer, α+α 2 dual-phase layer, and α 2 -Ti 3 Al layer.

TL;DR: In this article, the influence of heat treatment on the anisotropic plastic deformation behaviors of 6016-O and 6016 T4 aluminum alloy sheets was investigated and an appropriate yield function for each material was determined and employed in the finite element analysis of the hole expansion forming process.

TL;DR: In this article, the authors proposed fracture-based forming limit criteria for anisotropic materials in sheet metal forming to predict the sudden fracture in complicated forming processes, where the Lou-Huh ductile fracture criterion was modified using the Hill's 48 yield function instead of the von Mises isotropic yield function to account of the influence of anisotropy on the equivalent plastic strain at the onset of fracture.

TL;DR: In this article, a unified viscoplastic constitutive model within the framework of Chaboche model was developed by improving the nonlinear isotropic hardening rule and the kinematic hardness rule with a cyclic softening parameter.

TL;DR: In this article, the plastic deformation characteristics (including the hardness, strain rate sensitivity, and activation volume) of nanocrystalline (NC) equiatomic NbMoTaW body-centered cubic (BCC) high-entropy alloy films (HEAFs) with thicknesses spanning from 100 to 2000nm at room temperature were investigated.

TL;DR: In this article, the elastic properties (uniaxial, shear and bulk moduli, Zener anisotropy index, and Poisson's ratio) and yield strengths under several different stress states of the Schwarz Primitive TPMS sheet-based foam (referred to as P-foam) are investigated by finite element analyses of unit cells under periodic boundary conditions.

TL;DR: In this article, single and multiple slip activation, slip localization and microstructure-sensitive stress evolution have been examined using high-resolution digital image correlation to quantify the developing strain fields and the strain localization in both single and oligocrystals in fatigue.

TL;DR: In this article, a discrete-based modeling method is proposed, as an alternative to existing continuum methods, to analyse the fracturing behavior of soft rocks, and a new cohesive model coupling damage mechanics with plasticity theory is formulated to characterise the failure mechanisms of cement bridges between aggregates in the materials.

TL;DR: In this paper, the mechanical response and texture evolution of rare-earth-containing magnesium alloy sheet, ZEK100, are measured under uniaxial (tension and compression) loading along the rolling direction (RD), 45° to rolling direction(DD), transverse direction (TD) and normal direction (ND), at the strain rate of 10 −4 to 3 ǫ 10 3 s −1, and temperatures of 22 Â c and 150 Â C.

TL;DR: The tensile deformation behavior of Al-Mg-Si alloy under a pulsed electric current has been investigated in this paper, where a constitutive model based on dislocation density model and precipitation hardening model is proposed to describe the uniaxial tensile behavior for the age hardening alloys.

TL;DR: In this paper, a simple coupling of quadratic and non-quadratic yield functions with a non-associated flow rule is proposed to describe the evolution of yield surface (or anisotropic hardening).

TL;DR: In this paper, a set of unified constitutive equations is presented that predict the asymmetric tension and compression creep behavior and recently observed double primary creep of pre-stretched/naturally aged aluminium-cooper-lithium alloy AA2050-T34.

TL;DR: In this paper, an anisotropic fracture criterion is proposed for ductile fracture of lightweight metals, which couples effect of stress triaxiality on void growth, and assumes the shear linking-up of voids governed by the largest shear stress.

TL;DR: In this article, the authors employ the recently developed framework for the explicit modeling of discrete twin lamellae within a 3D crystal plasticity finite element (CPFE) model to examine the effects of dislocation densities in the twin domain on twin thickening.

TL;DR: In this paper, a 3D thermomechanical finite-strain constitutive model for cyclic pseudoelasticity of polycrystalline shape memory alloys (SMAs) is presented.

TL;DR: In this article, a finite element (FE) implementation of an elasto-plastic self-consistent (EPSC) polycrystal plasticity model is presented for simulations of metal forming.

TL;DR: In this article, a crystal-plasticity finite element method was used to study the deformation behavior of a commercially pure titanium Grade 1 sheet upon different strain paths, focusing especially on the role of the activity of twinning in the plastic deformation.

TL;DR: In this paper, the work hardening behavior of Mg-Y binary alloys has been studied under uniaxial tension and compression at 4,K, 78,K and 298,K.

TL;DR: In this paper, a regularized gradient-extended damage-plasticity model based on a micromorphic approach in the spirit of Forest (2009) is discussed, where damage and plasticity are treated as independent but strongly coupled dissipative phenomena by means of a two-surface formulation, and thermodynamically consistent evolution equations are derived.

TL;DR: In this article, an anisotropic continuum damage and failure model for ductile metals with focus on negative stress triaxialities was proposed. But the authors did not consider the effect of stress state on damage criteria as well as on evolution equations of damage strains.

TL;DR: In this article, the effects of NG layer thickness and separation as well as the loading direction on the predicted strength and inelastic deformation profile of MG-NG nanolaminate composites were analyzed.

TL;DR: In this article, the authors studied the mobility law of dislocations in aluminum as an important building block for the development of a multiscale method that couples an atomistic model with discrete dislocation dynamics in 3D.

TL;DR: In this paper, a hyperelastic-thermoviscoplastic constitutive model including thermomechanical coupling is presented to predict the mechanical behavior of semi-crystalline polymers.

TL;DR: In this article, a phase transition-based viscoelastic model including the time factor for shape memory polymers (SMPs) is proposed to describe the phase transition phenomenon of SMPs, and different constitutive structures for above and below transformation temperature separately.

TL;DR: In this article, the effect of cyclic loading frequency on pseudoelastic behavior and low cycle fatigue of shape memory alloys (SMAs) is investigated, and a new strain energy based fatigue model is proposed, and validated by experiments performed under different load ratios.

TL;DR: In this article, a fractional order derivative of the plastic yield function is used to describe the state-dependent stress-dilatancy behavior of granular soil using fractional-order derivations.

TL;DR: In this article, the authors quantified the impact of the transformation of the metastable austenite phase embedded in a ferrite-bainite-martensite matrix on the work hardening of a high-strength industrial TRIP-assisted dual-phase steel.