Effect of grain size and arrangement on dynamic damage evolution of ductile metal

doi:10.1088/1674-1056/22/4/046203

Chin. Phys. B ›› 2013, Vol. 22 ›› Issue (4): 46203-046203.doi: 10.1088/1674-1056/22/4/046203

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

Effect of grain size and arrangement on dynamic damage evolution of ductile metal

祁美兰^a, 钟声^a, 贺红亮^b, 范端^a, 赵黎^a

a School of Science, Wuhan University of Technology, Wuhan 430070, China;
b National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics,Mianyang 621900, China

收稿日期:2012-07-09 修回日期:2012-09-16 出版日期:2013-03-01 发布日期:2013-03-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 1117221 and 11072119) and the Defense Industrial Technology Development Program and the Fundamental Research Funds for the Central Universities (Grant Nos. B1520110003 and 2012-Ia-004).

Effect of grain size and arrangement on dynamic damage evolution of ductile metal

Qi Mei-Lan (祁美兰)^a, Zhong Sheng (钟声)^a, He Hong-Liang (贺红亮)^b, Fan Duan (范端)^a, Zhao Li (赵黎)^a

a School of Science, Wuhan University of Technology, Wuhan 430070, China;
b National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics,Mianyang 621900, China

Received:2012-07-09 Revised:2012-09-16 Online:2013-03-01 Published:2013-03-01
Contact: Qi Mei-Lan E-mail:Emmy_qi@163.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 1117221 and 11072119) and the Defense Industrial Technology Development Program and the Fundamental Research Funds for the Central Universities (Grant Nos. B1520110003 and 2012-Ia-004).

摘要/Abstract

摘要： Plate-impact experiments have been carried out to examine the effect of grain size and grain arrangement on the damage evolution of ultrapure aluminum. Two groups of samples, "cross-cut" and "longitudinal-cut," are obtained from the rolled aluminum rod along different directions. The peak compressive stress is approximately 1.25 GPa-1.61 GPa, which can cause incipient spall damage that is correlated to the material microstructure. The metallographic analyses of all recovered samples show that nearly all damage nucleates at the grain boundaries, especially those with larger curvature. Moreover, under lower shock stress, the spall strength of the "longitudinal-cut" sample is smaller than that of the "cross-cut" sample, because the different grain sizes and arrangement of the two samples cause different nucleation, growth, and coalescence processes. In this study, the difference in the damage distribution between "longitudinal-cut" and "cross-cut" samples and the causes for this difference under lower shock-loading conditions are also analyzed by both qualitative and semi-quantitative methods. It is very important for these conclusions to establish reasonable and perfect equation of damage evolution for ductile metals.

关键词: grain size, grain arrangement, damage evolution, spall strength

Abstract: Plate-impact experiments have been carried out to examine the effect of grain size and grain arrangement on the damage evolution of ultrapure aluminum. Two groups of samples, "cross-cut" and "longitudinal-cut," are obtained from the rolled aluminum rod along different directions. The peak compressive stress is approximately 1.25 GPa-1.61 GPa, which can cause incipient spall damage that is correlated to the material microstructure. The metallographic analyses of all recovered samples show that nearly all damage nucleates at the grain boundaries, especially those with larger curvature. Moreover, under lower shock stress, the spall strength of the "longitudinal-cut" sample is smaller than that of the "cross-cut" sample, because the different grain sizes and arrangement of the two samples cause different nucleation, growth, and coalescence processes. In this study, the difference in the damage distribution between "longitudinal-cut" and "cross-cut" samples and the causes for this difference under lower shock-loading conditions are also analyzed by both qualitative and semi-quantitative methods. It is very important for these conclusions to establish reasonable and perfect equation of damage evolution for ductile metals.

Key words: grain size, grain arrangement, damage evolution, spall strength

中图分类号: (High-pressure effects in solids and liquids)

62.50.-p

62.50.Ef (Shock wave effects in solids and liquids) 62.20.mm (Fracture)

祁美兰, 钟声, 贺红亮, 范端, 赵黎. Effect of grain size and arrangement on dynamic damage evolution of ductile metal[J]. Chin. Phys. B, 2013, 22(4): 46203-046203.

Qi Mei-Lan (祁美兰), Zhong Sheng (钟声), He Hong-Liang (贺红亮), Fan Duan (范端), Zhao Li (赵黎). Effect of grain size and arrangement on dynamic damage evolution of ductile metal[J]. Chin. Phys. B, 2013, 22(4): 46203-046203.

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Effect of grain size and arrangement on dynamic damage evolution of ductile metal

Effect of grain size and arrangement on dynamic damage evolution of ductile metal

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