Author(s)

F.E.G. Chimisso & H.S. Costa Mattos

Abstract

Modeling the softening behavior of damageable elasto-plastic bars F.E.G. Chimisso/ H.S. Costa Mattos* " Department of Mechanical Engineering, Fundagao Rio Grande, RS, Brasil * Department of Mechanical Engineering, Pontificia Universidade Catolica do Rio de Janeiro, 22453-900, Rio de Janeiro, RJ, Brasil ABSTRACT In the present work, a thermodinamically consistent mechanical model for damageable elasto-plastic materials is proposed. The governing equations are obtained within the framework of a microstructure theory since an scalar variable, a, (called cohesion variable and related with the links between material points) is introduced as an additional kinematic variable. The constitutive equations are developed within a thermodynamic framework, taking the cohesion variable a and also its gradient Vot, as state variables. This model leads to an adequate description of the softening behavior due to the degradation of the microstructure. The main features of the propos

Keywords