Plastically-driven variation of elastic stiffness in green bodies during powder compaction. Part II: Micromechanical modelling

TL;DR

This paper develops a micromechanical model to analyze how elastic stiffness in ceramic green bodies increases during powder compaction due to plastic deformation, validating the model with numerical simulations.

Contribution

It introduces a micromechanical approach to quantify elastic stiffness variation during powder compaction, linking it to plastic deformation and density changes.

Findings

Elastic modulus increases with forming pressure.

Elastic modulus linearly depends on relative density.

Poisson's ratio dependence is qualitatively explained.

Abstract

A micromechanical approach is set-up to analyse the increase in elastic stiffness related to development of plastic deformation (the elastoplastic coupling concept) occurring during the compaction of a ceramic powder. Numerical simulations on cubic (square for 2D) and hexagonal packings of elastoplastic cylinders and spheres validate both the variation of the elastic modulus with the forming pressure and the linear dependence of it on the relative density as experimentally found in Part~I of this study, while the dependence of the Poisson's ratio on the green's density is only qualitatively explained.