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Strain Rate Effects in Porous Materials

Published online by Cambridge University Press:  10 February 2011

J. Lankford Jr.  and
K. A. Dannemann
J. Lankford Jr.
Affiliation:
Southwest Research Institute, 6220 Culebra Rd., San Antonio, TX 78238–5166
K. A. Dannemann
Affiliation:
Southwest Research Institute, 6220 Culebra Rd., San Antonio, TX 78238–5166
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Abstract

The behavior of metal foams under rapid loading conditions is assessed. Dynamic loading experiments were conducted in our laboratory using a split Hopkinson pressure bar apparatus and a drop weight tester; strain rates ranged from 45 s−1 to 1200 s−1. The implications of these experiments on open-cell, porous metals, and closed- and open-cell polymer foams are described. It is shown that there are two possible strain-rate dependent contributors to the impact resistance of cellular metals: (i) elastic-plastic resistance of the cellular metal “skeleton,” and (ii) the gas pressure generated by gas flow within distorted open cells. A theoretical basis for these implications is presented.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 521: Symposium R – Porous & Cellular Materials for Structural Applications , 1998 , 103
Copyright
Copyright © Materials Research Society 1998

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References

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