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

Schramm, Joseph P. and Demetriou, Marios D. and Johnson, William L. and Poon, Benny and Ravichandran, Guruswami and Rittel, Daniel (2010) Effect of strain rate on the yielding mechanism of amorphous metal foam. Applied Physics Letters, 96 (2). 021906. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:20100216-100531174

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.3279132DOIUNSPECIFIED
http://link.aip.org/link/?APPLAB/96/021906/1PublisherUNSPECIFIED
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.
Group:GALCIT
Funders:
Funding AgencyGrant Number
MRSEC Program, NSFDMR-0520565
Office of Naval ResearchN00014-07-1-1115
Subject Keywords:acoustic wave propagation; amorphous state; buckling; copper alloys; metal foams; nickel alloys; palladium alloys; phosphorus alloys; plasticity
Classification Code:PACS: 82.70.Rr; 62.65.+k; 62.20.fq; 81.40.Lm; 62.20.mq
Record Number:CaltechAUTHORS:20100216-100531174
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100216-100531174
Official Citation:Effect of strain rate on the yielding mechanism of amorphous metal foam Joseph P. Schramm, Marios D. Demetriou, William L. Johnson, Benny Poon, Guruswami Ravichandran, and Daniel Rittel, Appl. Phys. Lett. 96, 021906 (2010), DOI:10.1063/1.3279132
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17483
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:16 Feb 2010 19:25
Last Modified:29 Sep 2016 23:16

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