Rate-Dependent Constitutive Model Coupled with Temperature Softening for Open-Cell Aluminum Foam

Abstract:

Both quasi-static compressive tests and dynamic loading tests on the open-cell aluminum foam made of 6061 aluminum alloy were firstly conducted. The Split Hopkinson Pressure Bar (SHPB) apparatus was used to perform the dynamic loading tests. The rate-dependent constitutive model for the open-cell aluminum foam was then studied. Based on the empirical constitutive model proposed by Sherwood for polyurethane foam, a new function was found to analyze the three-stage characteristic of quasi-static stress-strain curve of the aluminum foam. Moreover, the temperature softening was also modified. Thus a new strain rate hardening constitutive model coupled with temperature softening for the open-cell aluminum foam was obtained. Finally, both Taylor impact tests and finite element analysis (FEA) were conducted to verify the new constitutive model and the results show that the model was reliable.

• Periodical: Applied Mechanics and Materials (Volume 470)
• Pages: 70-75
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.470.70
• Online since: December 2013
• Authors: Wei Zheng*, Bao Jun Pang, Yong Chen
• Keywords: Constitutive Model, Open-Cell Aluminum Foam, Strain Rate Effects, Taylor Impact, Temperature Softening

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