A new phenomenological strain hardening function is proposed to describe the behavior of metallic materials. The based on a simplification an earlier established self and latent crystal plasticity approach. contains only four parameters, which can be readily obtained using efficient numerical technique by fitting experimental curve. Several applications different materials are presented good ag...

This document describes a recently developed analysis tool that enhances the resident capabilities of the Micromechanics Analysis Code with the Generalized Method of Cells (MAC/GMC) (Refs. 1 to 3) and its application. MAC/GMC is a composite material and laminate analysis software package developed at NASA Glenn Research Center. The primary focus of the current effort is to provide a graphical u...

In this paper, we analyze a quasistatic problem modeling frictional contact between viscoplastic body and an obstacle, the so called foundation. The material constitutive relation is assumed to be non-linear. boundary conditions of friction are modeled respectively by \textit{Signorini} generalized Coulomb's non-local law. We derive variational formulation for prove existence its unique weak so...

The mathematical theory of quasistatic elastic viscoplastic models with damage is studied. The existence of the unique local weak solution is established by using approximate problems and a priori estimates. Pointwise estimates on the damage are obtained using a new comparison technique which removes the necessity of including a subgradient term in the equation for damage.

Metallic glasses are amorphous materials that possess unique mechanical properties, such as high tensile strengths and good fracture toughnesses. Also, since they are amorphous, metallic glasses exhibit a glass transition, and at temperatures above this glass transition, they soften dramatically and are therefore amenable to net-shape thermoplastic forming processes. This combination of superio...

In this paper we study a start-up shear flow of recently proposed model shear-thinning fluid that mimics the response class viscoplastic materials, namely between parallel plates, one which is fixed and other started impulsively. simple flows while generalized viscosity blows up, stress yet finite thus able to mimic fluids. The analytical solution velocity profile obtained using semi-inverse ap...

We propose a universal method for the evaluation of generalized standard materials that greatly simplifies material law implementation process. By means automatic differentiation and numerical integration scheme, AutoMat reduces effort to two potential functions. moving GPU, we close performance gap conventional routines demonstrate in detail expression level reverse mode as well its extension ...

This paper presents a combined numerical-theoretical study of the macroscopic behavior and local field distributions in a special class of two-dimensional periodic composites with viscoplastic phases. The emphasis is on strongly nonlinear materials containing pores or rigid inclusions. Full-field numerical simulations are carried out using a Fast-Fourier Transform algorithm [H. Moulinec, P. Suq...