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Peak Load in Rapid Compression Tests: Experiments and Micromechanical Modelling

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conference contribution
posted on 15.11.2010, 12:47 by Véronique Favier, Helen V. Atkinson
Rapid compression tests are useful to characterize the semisolid behaviour in thixoforming conditions. The load-displacement curves typically display a peak load. The origin, the maximum value and the height of this peak are discussed comparing calculated results obtained using a micro-macro model and experimental data obtained in earlier work. As suggested by experiments, the calculated peak load originates from a 3D continuous solid skeleton, which breaks down under load. For the same initial semisolid structure, the model predicts that decreasing the ram speed decreases the maximum of the peak because of a strain rate effect. In addition, the peak load is found to be quite sensitive to initial internal structure, namely the volume fraction of entrapped liquid, which may change for various soaking times. Finally, the time for the solid skeleton breakdown is found to be in good agreement with experimental results.

History

Citation

Proceedings of the 12th International ESAFORM Conference on Material Forming, 2009

Published in

Proceedings of the 12th International ESAFORM Conference on Material Forming

Publisher

ESAFORM (European Scientific Association For Material Forming)

Available date

15/11/2010

Publisher version

http://esaform.insa-lyon.fr/

Notes

This paper was presented at the 12th International ESAFORM Conference on Material Forming, Twente, The Netherlands, April 27-29 2009, and published in the Proceedings.

Language

en