Multi-spall in ductile metal under triangular impulse loading
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摘要: 基于应力瞬时断裂判据和Tuler-Butcher损伤累积判据，分析了没有升压的简单三角波强加载下延性金属的多次层裂破坏问题。分析结果显示：层裂片的厚度随着冲击波宽度与强度的比值的增大而增大，材料的破坏深度小于冲击波宽度的一半；在强冲击加载下，材料的破坏深度约为冲击波宽度的一半。Abstract: This paper presents a study on the multi-spall of ductile metal induced by triangular impulse, using the simple cut-off pressure model and Tuler-Batcher's accumulative damage model to describe the spall. Numerical results show that the spall thickness increases with increasing ratio of pulse length to strength of shock wave and the destroy depth of the target approximates to half of pulse width under extreme loading.
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Key words:
- multi-spall /
- triangular impulse /
- spalling thickness /
- spall model
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图 1 层裂形成示意图
Figure 1. Spall caused by triangular pressure pulse reflected from the rear surface
图 2 层裂片厚度与加载条件的关系
Figure 2. Spall thickness increase with increasing ratio of pulse length to strength of shock wave
图 3 层裂片厚度与冲击波宽度和强度之间的关系
Figure 3. Spall thickness as a fuction of pulse length and strength of shock wave
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