... by 130%, the yield strength and ultimate tensile strength of a fully carburized sample can be increased by respectively 90% and 85%. This hardening effect is driven by the precipitation of carbides formed during solidification offering pinning points for dislocations and grain boundaries...

...P. Grammenoudis; D. Reckwerth; Ch. Tsakmakis Anisotropic viscoplasticity coupled with anisotropic damage has been modeled in previous works by using the energy equivalence principle appropriately adjusted. Isotropic and kinematic hardenings are present in the viscoplastic part of the model...

.... Amorphous phase hardening is considered into the model and associated with the molecular configurations arising during the deformation process. The equation governing damage evolution is obtained by choosing a particular form based on internal energy and entropy. For the crystalline phase, the proposed...

...Jing Li; Qiang Sun; Zhong-Ping Zhang; Chun-Wang Li; Dong-Wei Zhang Based on the critical plane approach, the drawbacks of the Wang–Brown (WB) model are analyzed. It is discovered that the normal strain excursion in the WB model cannot account for the additional cyclic hardening well. In order...

.... A parametric study is conducted showing principally the influence of the some important parameters (the grain shape ( α ) and the new viscous parameter γ ) and the effect of their interaction on the hardening evolution of polycrystals. Quantitatively, it is recognized that the model describes suitably...

... for nucleation. The matrix is modeled as elastic-plastic with pure kinematic hardening expressed in a hardening minus dynamic recovery format. The inclusion and interphase are modeled as isotropic linear elastic. An idealized spherical, homogeneous inclusion is considered to facilitate parametric study...

... ). These articles present strain-based forming limit curves ( ϵ FLCs ) for both as-received and prestrained sheets. Using phenomenological yield functions, and assuming isotropic hardening, the ϵ FLCs are transformed into principal stress space to obtain stress-based forming limit curves ( σ FLCs...

...Sergiy Kalnaus; Yanyao Jiang Tension-compression, torsion, and axial-torsion fatigue experiments were conducted on the AL6XN alloy to experimentally investigate the cyclic plasticity behavior and the fatigue behavior. The material is found to display significant nonproportional hardening when...

... equations in the framework of continuum damage mechanics under large plastic deformation are presented. Special care is paid to the strong coupling between the main mechanical fields such as elastoplasticity, mixed nonlinear isotropic and kinematic hardenings, ductile isotropic damage, and contact...

... and electron back-scattered diffraction (EBSD) maps are obtained from the near-tip region. The experiments are complemented by performing 3D and 2D plane strain finite element simulations within a continuum crystal plasticity framework assuming an isotropic hardening response characterized by the Pierce–Asaro...

.... The polymer deformation is described by an improved macromolecular constitutive model accounting for strain-rate-, pressure-, and temperature-sensitive yielding, isotropic hardening before peak yield, intrinsic postyield softening, and rapid anisotropic hardening at large strains. A new craze model...

... diffraction yield strength cavitation jet peening residual stress hardening surface morphology Fatigue behavior of metallic materials can be improved by introducing compressive stresses at the surface. Shot peening is widely used in the automobile and aerospace industries to introduce...

... Prandtl–Reuss flow rule, and a generalized Armstrong–Frederick kinematic hardening law. The model is implemented using a return mapping algorithm with backward Euler integration for stability and the Newton method to determine the plastic multiplier. Material parameters are characterized from uniaxial...

... in aluminum alloys are discussed. 10 03 2005 31 07 2006 pipes forming processes aluminium alloys extrusion tempering ductility mechanical strength hardness hardening automobile industry automotive components Recent success of aluminum tube-hydroformed components...

... that the predictions of this model well describe qualitatively and quantitatively the intrinsic softening immediately after yielding and the subsequent progressive orientational hardening corresponding to the response of two polymers, amorphous polyethylene terephthalate and rubber toughened polymethyl methacrylate...

... with time, the characterization and representation of the behavior is both critical and complex. Many approaches have been suggested and tried, ranging from 1D or 2D implementations of simple linear elastic cure hardening responses (which have been shown to be essentially pseudo-viscoelastic formulations...

... to be equal to the intrinsic dissipation rate, the kinematic hardening plasticity as a demonstration of the scale invariance approach by Aifantis (1995, “From Micro- to Macro-plasticity: The Scale Invariance Approach”), can be well accommodated within the framework of normality structure. Therefore, the scale...

...Jenn-Terng Gau; Gary L. Kinzel A new model for springback, based on isotropic and kinematic hardening models, the Mroz multiple surfaces model, and observations from experimental data, is proposed in this paper. In this model, a material parameter (CM), which is significant after reverse yielding...

... slip plastic flow hardening recovery dislocation density elastic deformation kinematics torsion compressive strength bending This article is concerned with the analysis of the heterogeneous character of plastic flow at the micrometer level. In particular, the case of monocrystalline...

...S. Kucharski; Z. Mro´z The identification method of hardening parameters specifying stress-strain curve is proposed by applying spherical indentation test and measuring the penetration depth during loading and unloading. The loading program is composed of a geometric sequence of loading and partial...