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Published January 11, 2010 | Published
Journal Article Open

Effect of strain rate on the yielding mechanism of amorphous metal foam


Stochastic amorphous Pd_(43)Ni_(10)Cu_(27)P_(20) foams were tested in quasistatic and dynamic loading. The strength/porosity relations show distinct slopes for the two loading conditions, suggesting a strain-rate-induced change in the foam yielding mechanism. The strength/porosity correlation of the dynamic test data along with microscopy assessments support that dynamic foam yielding is dominated by plasticity rather than elastic buckling, the mechanism previously identified to control quasistatic yielding. The strain-rate-induced shift in the foam yielding mechanism is attributed to the rate of loading approaching the rate of sound wave propagation across intracellular membranes, thereby suppressing elastic buckling and promoting plastic yielding.

Additional Information

© 2010 American Institute of Physics. Received 23 September 2009; accepted 30 November 2009; published 14 January 2010. This work was supported in part by the MRSEC Program of the National Science Foundation under Award No. DMR-0520565 and by the Office of Naval Research under Grant No. N00014-07-1-1115.

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