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The present paper proposes a mathematical development of the plasticity and damage approaches to simulate sheet metal forming processes. It focuses on numerical prediction deformation during deep drawing process when crack appears. Anisotropic constitutive equations are proposed. A fully implicit integration coupling is used leads two nonlinear local scalar that solved by Newton’s method. devel...

A constitutive model for isotropic, semi-crystalline polymers is proposed. The Eulerian in the sense that it independent of measures total deformation and plastic/inelastic deformations. It able to account such essential phenomena as strain-rate dependence, work hardening, stress relaxation, volumetric inelastic deformations, damage. was applied uniaxial tension tests performed on polyoxymethyl...

the paper aims at investigating the effects of chemical reaction and thermal radiation on the steady two-dimensional laminar flow of viscous incompressible electrically conducting micropolar fluid past a stretching surface embedded in a non-darcian porous medium. the radiative heat flux is assumed to follow rosseland approximation. the governing equations of momentum, angular momentum, energy, ...

It is controversial whether the plastic Poisson’s ratio and ellipticity are invariable in Deshpande–Fleck model, which describes constitutive behavior of foam materials. In this paper, model modified by a variable plasticity based on nonassociated flow rule. The measured situ digital image correlation (DIC) technology during uniaxial compression experiment aluminum foam. then determined through...

Surface nano-crystallization techniques have been recently developed as one of the most effient ways to optimize materials’ structure, and therefore develop local global mechanical behavior increase strength without compromising ductility. In this work, we present a constitutive model incorporating grain refinement hardening simulate technique, specifically, surface attrition treatment. The com...

In latest years small scale machining has been widely used in advanced engineering applications such as medical and optical devices, micro- nano-electro-mechanical systems. micromachining of metals, a depth cut becomes usually smaller than an average crystal size polycrystalline structure; thus, the cutting process zone can be localized fully indoors single grain. Due to crystallographic anisot...

The paper presents a simple but efficient new numerical scheme for the integration of nonlinear constitutive equations. Although it can be used for integration of system of algebraic and differential equations in general, the scheme is primarily developed for use with direct solution methods for solving boundary value problems, e.g. explicit dynamic analysis in ABAQUS/Explicit. In the developed...