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Measurements of dynamic yield strength of aluminum alloy and mechanism analysis of elastic precursor during reloading

Hu Jian-Bo Tan Hua Yu Yu-Ying Dai Cheng-Da Ran Xian-Wen

Measurements of dynamic yield strength of aluminum alloy and mechanism analysis of elastic precursor during reloading

Hu Jian-Bo, Tan Hua, Yu Yu-Ying, Dai Cheng-Da, Ran Xian-Wen
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  • Received Date:  08 February 2007
  • Accepted Date:  23 April 2007
  • Published Online:  15 January 2008

Measurements of dynamic yield strength of aluminum alloy and mechanism analysis of elastic precursor during reloading

  • 1. (1)中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室,绵阳 621900; (2)中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室,绵阳 621900;国防科学技术大学理学院技术物理研究所,长沙 410073

Abstract: Dynamic yield strength is one of the key variables in construction of the constitutive relationship for solids under shock loading. This paper reports the yield strength of LY12 aluminum alloy which was measured experimentally on the basis of the method proposed by J. R. Asay and L. C. Chhibildas, in which the test sample underwent a load-reload process and a load-unload process, and the particle velocity history at the LY12 Al sample/LiF transparent window interface was observed by velocity interferometer system for any reflecting surface (VISAR). Improvement in fabrication of the layered flyer plate made these experiments successful. The measured yield strength data at shock stresses of 22GPa and 34GPa are consistent with the reported data at relatively lower pressures. Moreover, physical mechanism of the elastic precursor emerging in the reloading-process was discussed briefly. It is concluded that dislocations is the principal factor resulting in the elastic precursor.

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