预应力对LY12铝弹性前驱波的影响

张世文; 刘仓理; 李庆忠; 刘乔

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

预应力对LY12铝弹性前驱波的影响

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

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重点实验室，四川绵阳 621999
2.
中国工程物理研究院，四川绵阳 621999

基金项目: 国家自然科学基金项目(11272297, 10772165)

详细信息

作者简介:
张世文(1971—), 男, 博士, 副研究员, zhangswxueshu@163.com

中图分类号: O381
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- 被引次数: 4
出版历程
- 收稿日期: 2014-05-07
- 修回日期: 2014-10-08
- 刊出日期: 2015-12-10

Influence of pre-stress on elastic precursor of LY12 aluminum

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

摘要

摘要: 通过过盈配合的热装配方法对LY12铝合金平面样品施加了径向预应力，采用平面飞片撞击方法获得了预应力对弹性前驱波的影响。结果表明：当飞片均以500 m/s的速度撞击样品时，压缩预应变为0(无预应变)、964.5×10^-6和1 886.0×10^-6时，弹性前驱波幅值分别为87.56、95.24、121.03 m/s，压缩预应力(变)提高了LY12铝弹性前驱波幅值。结合实验的特点，探讨了对样品施加静态径向预应力的数值模拟方法，结果表明，上升沿(100 μs)较为缓慢的加载可以达到与准静态加载应力分布一样的结果。采用该数值模拟方法给出和验证了弹性前驱波随压缩预应力增加而上升的计算结果，与实验结果较为吻合。
- 爆炸力学 /
- 预应力(预应变) /
- 平面飞片撞击 /
- 弹性前驱波
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

HTML全文

图 1 热装配示意图

Figure 1. Sketch of heat assemblage

下载: 全尺寸图片幻灯片

图 2 样品过盈配合实验装置

Figure 2. Pre-strain sample with bracket

下载: 全尺寸图片幻灯片

图 3 不同预应变下样品后自由面速度曲线

Figure 3. Free surface velocity histories for different pre-strain samples

下载: 全尺寸图片幻灯片

图 4 计算模型(右图为样品截面上网格划分)

Figure 4. Calculation model (mesh of sample section on the right)

下载: 全尺寸图片幻灯片

图 5 样品外边界施加不同上升沿的位移曲线

Figure 5. Two kinds of displace-time curves loading on samples' outer boundary

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图 6 样品中心和外边界部位的径向预应力

Figure 6. Samples' radical pre-stress (center-element 1, and outer boundary-element 2)

下载: 全尺寸图片幻灯片

图 7 不同预应变样品后自由面速度曲线计算结果

Figure 7. Free surface velocity histories for different pre-strain samples

下载: 全尺寸图片幻灯片

表 1 不同径向预应力下实验结果

Table 1. Experimental results of samples under different pre-strains

ε_{0, r}/10^-6 σ_{0, r}/MPa v/(m·s^-1) u_e^*/(m·s^-1)

0 0 497.82 87.56

964.5 99.2 497.06 95.24

1 886.0 194.0 499.60 121.03

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