Influence of Surface Roughness on Shock Melted Tin
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摘要: 对两种表面粗糙度的金属锡样品开展了一维平面冲击微层裂实验，采用自行研发的多点动量测试装置获取熔化金属破碎区粒子动量的时空分布信息。测试结果表明，对于百纳米级粗糙度精磨样品，在加载稀疏波的作用下，熔化金属出现典型的分层断裂现象。应用光滑粒子流体动力学方法与Autodyn程序，开展了金属锡微层裂过程的细观尺度模拟，研究自由面稀疏波沿样品厚度方向传播时界面不稳定性增长的特征。研究发现，微米尺度的表面粗糙度足以使扰动伴随反射稀疏波的传播而充分增长，卸载区熔化金属充分破碎，破碎粒子同时具有冲击方向和径向的分散性，与实验测试结果相符合。Abstract: One dimensional plate micro-spall impact experiments were performed on two samples of melted tin with different surface roughness using our own newly developed momentum device to measure the momentum of the ejecta at different positions and moments.Using the Autodyn Smooth Particle Hydrodynamics (SPH) solver, we simulated the microscopic process of the shock-induced micro-spall underneath the sample surface and investigated the evolution of the interfacial instability along with the transmission of the reflective wave in the unloading process.The study shows that the surface roughness of several micro-meters can lead to significant growth of disturbance during the wave reflection, and that the fully fragmented particles of the melted metal bearing both longitudinal and radial transversal speed components are in agreement with those of the experimental results.
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Key words:
- micro-spall /
- unloading melting /
- momentum test /
- surface roughness
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图 3 锡微层裂多点动量测试原始数据
(a) Fine lapped specimen (b) General lapped specimen
Figure 3. Original data of multiple momentum survey device for microspall of tin
图 4 反积分计算的动量探头撞击面压力
(a) dr=4.5 mm (b) dr=7.5 mm
Figure 4. Collision pressure on the surface of momentum probe by backward integration method
图 5 计算模型
(a) General lapped specimen (b) Fine lapped specimen
Figure 5. Calculational model
图 7 不同厚度处的速度历史
(a) General lapped specimen (b) Fine lapped specimen
Figure 7. The velocity history of different thickness
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