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Analysing the semi-solid response under rapid compression tests using multi-scale modelling and experiments

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journal contribution
posted on 17.11.2010, 13:39 by Véronique Favier, Helen V. Atkinson
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, this paper presents a model based on micromechanical approaches and homogenisation techniques. This model is an extension of a previous model established in a pure viscoplastic framework to account for elasticity. Indeed, experimental load-displacement signals revealed 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.

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Citation

Transactions of Nonferrous Metals Society of China, 2010, 20 (9), pp. 1691-1695

Published in

Transactions of Nonferrous Metals Society of China

Publisher

Elsevier

issn

1003-6326

Copyright date

2010

Available date

17/11/2010

Publisher version

http://www.sciencedirect.com/science/article/pii/S1003632609603599

Language

en

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