Analysis of limit strains of a high strain-rate superplastic AI6061/20SiCw composite under equibiaxial tension
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Since the publication of the pioneering work by Marciniak and Kuczynski, numerous research papers have appeared in the literature for the theoretical prediction of limit strains. However, less work has been done in the analysis of limit strains of high-strain-rate superplastic metal matrix composite sheets. In this paper, limit strains of a A16061/SiCw composite sheet deformed at a temperature of 873 K and under equibiaxial tension were predicted based on the M-K and a plastic damage model. It is shown that the predicted limit strain increases with increasingf o, and decreases with increasingD Bo/DAo, and it is able to predict limit strains of MMC sheets under equibiaxial tension in a reasonable agreement with the experimental results even without assuming any initial geometrical defect.
Key wordshigh-strain-rate superplastic limit strains metal matrix composites
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