Numerical Modeling of Elastoviscoplastic Material Model in Strain Space

Abstract

Conventional material non-linear analysis works with stress-space plasticity. It uses yield function, loading-unloading criteria, and flow rule in terms of stress parameters. It shows ambiguity in loading-unloading criteria for softening materials. During such situations, an alternative strain-space formulation becomes quite useful to carry out analysis of such materials. The viscoplastic response of materials requires the time integration of system of non-linear first order differential equations. In viscoplasiticy, the constitutive equation might become very complicated to evaluate, depending upon their degree of non-linearity. Attention in this proposed work is mainly focused on some of the aspects of the strain-space viscoplasticity, like, formulation of strain-space viscoplasticity and its implementation in finite element framework for solving the various engineering problems related with plasticity. Numerical calculation is carried out for some engineering problems and results are compared results in available literature result.

Cite this Article
Patil A. N., Dawari B. M. Numerical Modeling of Elastoviscoplastic Material Model in Strain Space. Journal of Experimental & Applied Mechanics. 2018; 9(1): 9–14p.