In situ dynamic compression wave behavior in additively manufactured lattice materials
In situ dynamic compression wave behavior in additively manufactured lattice materials
复制标题
增材制造晶格材料中的原位动态压缩波行为
DOI：
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发表时间：
2018
影响因子：
2.7
通讯作者：
Mukul Kumar
中科院分区：
文献类型：
--
作者：
J. Lind;B. Jensen;M. Barham;Mukul Kumar
结构材料(如规则晶格)的动态响应是不平凡的，部分原因是当材料被动态压缩时，整个结构和自由表面中的机械波相互作用。最近发现，在附加制造的晶格中存在弹性前驱波，这与理论预测和模拟结果相吻合。在这项工作的基础上，我们研究了弹性前驱体的行为与传播距离、撞击速度和撞击材料之间的关系。通过一系列气枪实验，结合X射线相衬成像测量和补充模拟，弹性前驱波速似乎几乎与撞击速度和撞击材料无关。我们观察到了在四种明显不同的撞击条件下，弹性波在许多单元格中持续传播的证据。我们将这些结果与实验的直接数值模拟进行了比较，发现了很好的一致性。
The dynamic response of structured materials, such as regular lattices, is nontrivial partly due to the interaction of mechanical waves throughout the structure and free surfaces as the material is dynamically compressed. The existence of an elastic precursor wave in additively manufactured lattices was recently shown to match theoretical predictions and simulation results. Following up on this work, we have investigated the behavior of the elastic precursor with propagation distance, impact speed, and impact material. Through a series of gas gun experiments coupled to X-ray phase contrast imaging measurements and complementary simulations, the elastic precursor wavespeed appears to be nearly independent of impact speed and impact material. We observed evidence for the sustained elastic wave propagation through many unit cells at four significantly different impact conditions. We compared these results with direct numerical simulations of the experiments and found good agreement.
在钻石光源下对高 Z 材料的次表面动力学进行 X 射线成像。
DOI：
10.1063/1.4904275
发表时间：
2014
期刊：
The Review of scientific instruments
影响因子：
--
作者：
Eakins DE
通讯作者：
Eakins DE