Plastic instability of LY12 aluminum alloy ring under longitudinal impact compression

Shi Chunying; Xu Songlin; Shan Junfang; Wang Pengfei; Hu Shisheng

doi:10.11883/1001-1455(2017)03-0471-08

Volume 37 Issue 3

Apr. 2017

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Shi Chunying, Xu Songlin, Shan Junfang, Wang Pengfei, Hu Shisheng. Plastic instability of LY12 aluminum alloy ring under longitudinal impact compression[J]. Explosion And Shock Waves, 2017, 37(3): 471-478. doi: 10.11883/1001-1455(2017)03-0471-08

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Plastic instability of LY12 aluminum alloy ring under longitudinal impact compression

doi: 10.11883/1001-1455(2017)03-0471-08

CAS Key Laboratory for Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, Anhui, China

Received Date: 2015-12-16
Rev Recd Date: 2016-04-29
Publish Date: 2017-05-25

Abstract

Abstract

Research on the longitudinal impact compression of an aluminum alloy ring found that an obvious stress-drop process will appear in the macro plastic hardening stage of the specimen under certain conditions. In order to reveal the mechanism of this stress-drop process, we conducted the longitudinal impact compression experiment on LY12 aluminum alloy ring specimens whose ratio of OD, ID and height was 6:3:2 using the split Hopkinson pressure bar (SHPB) under the three end face roughness conditions: lubrication, fine grinding and rough grinding. The experiment results show that the stress-drop process occurs mainly in the large strain and high strain rate loading conditions. Moreover, the results of the metallurgical analysis of the aluminum alloy ring specimens show that the formation and development of the adiabatic shear band is the intrinsic mechanism of the stress-drop process, which is a dynamic plastic instability. This study can serve as a reference for the study of the heat insulation shear band in metal materials under impact.
- impact compression,
- split Hopkinson pressure bar (SHPB),
- metallurgical analysis,
- shear band,
- plastic instability

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References

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