Compressive Strength of Shocked Aluminum for Stresses of 4-22 Gpa
- Institute for Shock Physics, Washington State University, Pullman, Washington 99164 (United States)
Measurements of the compressive strength are presented for several aluminum alloys shocked to 22 GPa. Five well characterized alloys were studied, including 6061 with grain sizes of 50, 30 and <5 {mu}m, and both pure and ultra pure Al with grain sizes of {approx} 200 and 300 {mu}m, respectively. The yield strength in the shocked state was estimated using reshock and release techniques. These results show that quasi-elastic recompression occurs for all materials investigated and is independent of grain size and impurity level. The present data, together with other data, illustrate that the yield strength of Al increases with shock stress to 90 GPa and suggest that the increase in strength at the shock state, {delta}Y ({delta}Y = Yyield - YHEL), increases with applied stress and plastic strain. A new model was developed to describe this increase and fits existing strength data on aluminum accurately to 55 GPa. The agreement strongly indicates that initial material properties, influence the ambient yield strength, but not the change in strength, which appears to be controlled by shock-deformation.
- OSTI ID:
- 20875764
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 845; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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