Influence of pre-stress on elastic precursor of LY12 aluminum

Zhang Shi-wen; Liu Cang-li; Li Qing-zhong; Liu Qiao

doi:10.11883/1001-1455(2015)06-0852-06

Volume 35 Issue 6

Nov. 2015

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Zhang Shi-wen, Liu Cang-li, Li Qing-zhong, Liu Qiao. Influence of pre-stress on elastic precursor of LY12 aluminum[J]. Explosion And Shock Waves, 2015, 35(6): 852-857. doi: 10.11883/1001-1455(2015)06-0852-06

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Zhang Shi-wen, Liu Cang-li, Li Qing-zhong, Liu Qiao. Influence of pre-stress on elastic precursor of LY12 aluminum[J]. Explosion And Shock Waves, 2015, 35(6): 852-857. doi: 10.11883/1001-1455(2015)06-0852-06

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Influence of pre-stress on elastic precursor of LY12 aluminum

doi: 10.11883/1001-1455(2015)06-0852-06

1.
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
2.
China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2014-05-07
Rev Recd Date: 2014-10-08
Publish Date: 2015-12-10

Abstract

Abstract

The effect of pre-stress on elastic precursor of disk-shaped LY12 aluminum samples was studied, and the radial pre-stress (or pre-strain) state was achieved by using an excessively-conjugated heat assembly device. In the experiment, the LY12 samples were impacted by flyer plates driven by a one-stage light-gas gun, and elastic precursor signals of the samples in several pre-strain states were measured by VISAR. The experimental results show that the elastic precursors are 87.56, 95.24 and 121.03 m/s respectively corresponding to the pre-strains of 0, 964.5×10^-6 and 1 886.0×10^-6 when the samples are impacted by the flyer plates with almost the same velocity. This clearly indicates that the pre-stress (pre-strain) increases the elastic precursor of LY12 aluminum. According to these experiments, we discussed how to apply static loading on the sample in the radial direction. The result shows that the loading with rising edge time 100 μs can produce the same stress distribution as that of static loading. Using this technology, the simulation results show that by increasing pre-stress we can enhance the elastic precursor velocity on the free surface of the samples. The simulated results are in good agreement with those from the experiments.
- mechanics of explosion,
- pre-stress,
- impact,
- elastic precursor

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References(17)

References

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