Analysis of semi-solid response under rapid compression tests using multi-scale modelling and experiments
Simulating semi-solid metal forming requires modelling semi-solid behaviour.However,such modelling is difficult because semi-solid behavior is thixotropic and depends on the liquid-solid spatial distribution within the material.In order to better understand and model relationships between microstructure and behavior,a model based on micromechanical approaches and homogenisation techniques is presented.This model is an extension of a previous model established in a pure viscoplastic framework to account for elasticity.Indeed,experimental load-displacement signals reveal the presence of an elastic-type response in the earlier stages of deformation when semi-solids are loaded under rapid compression.This elastic feature of the behaviour is attributed to the response of the porous solid skeleton saturated by incompressible liquid.A good quantitative agreement is found between the elastic-viscoplastic predicted response and the experimental data.More precisely,the strong initial rising part of the load-displacement curve,the peak load and the subsequent fall in load are well captured.The effect of solid fraction on mechanical response is in qualitative agreement with experiments.
semi-solid metal aluminium solid fraction elastic-viscoplasticity homogenization
V.FAVIER H.ATKINSON
Arts et Métiers ParisTech, CNRS PIMM, 151 Boulevard de lH-pital, 75013 Paris, France Department of Engineering, University of Leicester, University Road, Leicester, LE1 7RH, UK
国际会议
北京
英文
1691-1695
2010-09-16（万方平台首次上网日期，不代表论文的发表时间）