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|Title:||Analysing the semi-solid response under rapid compression tests using multi-scale modelling and experiments|
Atkinson, Helen V.
|Citation:||Transactions of Nonferrous Metals Society of China, 2010, 20 (9), pp. 1691-1695|
|Abstract:||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.|
|Rights:||This is the author’s final draft of the paper published as Transactions of Nonferrous Metals Society of China, 2010, 20 (9), pp. 1691-1695. The final published version is available at http://www.sciencedirect.com/science/article/pii/S1003632609603599 , Doi: 10.1016/S1003-6326(09)60359-9.|
|Appears in Collections:||Published Articles, Dept. of Engineering|
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