| 李伟,王鹏,李佳,罗景润,李明海.高速冲击下多胞材料细观结构中波传播规律[J].装备环境工程,2021,18(5):87-93. LI Wei,WANG Peng,LI Jia,LUO Jing-run,LI Ming-hai.Propagating Characterization of Shock Wave in the MesoscopicStructure of Cellular Materials[J].Equipment Environmental Engineering,2021,18(5):87-93. |
| 高速冲击下多胞材料细观结构中波传播规律 |
| Propagating Characterization of Shock Wave in the MesoscopicStructure of Cellular Materials |
| 投稿时间：2021-03-24 修订日期：2021-04-15 |
| DOI：10.7643/issn.1672-9242.2021.05.013 |
| 中文关键词: 多胞材料 Voronoi细观结构 局部应变梯度法 波阵面中图分类号:TJ04 文献标识码:A 文章编号:1672-9242(2021)05-0087-07 |
| 英文关键词:cellular materials Voronoi mesoscopic structure local strain gradient method shock wave front mechanism |
| 基金项目:国家自然科学基金青年项目(11902310，11802292) |
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| Author | Institution |
| LI Wei | Institute of System Engineering, CAEP, Mianyang 621900, China |
| WANG Peng | Institute of System Engineering, CAEP, Mianyang 621900, China |
| LI Jia | Institute of System Engineering, CAEP, Mianyang 621900, China |
| LUO Jing-run | Institute of System Engineering, CAEP, Mianyang 621900, China |
| LI Ming-hai | Institute of System Engineering, CAEP, Mianyang 621900, China |
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| 中文摘要: |
| 目的 获取安全防护结构中细观多胞材料在高速冲击下的波传播规律。方法 采用基于3D-Voronoi细观多胞结构数值仿真和基于最小二乘法的局部应变梯度法，研究细观多胞结构在高速冲击下的冲击波波阵面传播规律。通过细观多胞结构数值仿真提取的位移场数据，结合局部应变梯度法得到界面清晰的冲击波波阵面。结果 冲击端和支撑端分别诱发右行和左行冲击波波阵面。冲击波波阵面传播过程分为3个阶段，即冲击端诱发右行冲击波阶段、支撑端诱发左行冲击波且未压缩区刚性向右运动阶段和右行冲击波压缩区域与未压缩区域一体刚性向右运动阶段。通过冲击波波速的演化规律研究，分别获取了右行和左行冲击波波阵面的拉氏位置和拉氏波速，通过严格理论推导解释了右行冲击波波阵面具有恒定减加速度的结论。最后对冲击波波阵面划分阶段的合理性进行了验证。结论 基于3D-Voronoi细观多胞结构数值仿真和基于最小二乘法的局部应变梯度法可以获取界面清晰的冲击波波阵面，细观多胞结构在高速冲击下的冲击波波阵面传播规律可为安全防护结构的设计和研究提供参考依据。 |
| 英文摘要: |
| The paper aims to obtain the wave propagation law of mesoscopic cellular materials in the safety protection structure under high-speed impact.In this paper, using numerical simulation based on 3D-Voronoi mesoscopic structure and local strain gradient method based on least square method, the propagation law of shock wave front of mesoscopic structure under high-speed impact is studied. Through the displacement field data extracted by the numerical simulation of the mesoscopic structure, combined with the local strain gradient method based on least square method, the shock wave front with clear interface is obtained. The shock end and the support end induce right and left shock wave fronts respectively. The shock wave front propagation is divided into three stages, namely, the stage of shock wave induced by shock end to the right, the stage of shock wave induced by support end to the left and the uncompressed area moving rigidly to the right, and the stage of right shock wave compressed area and uncompressed area moving rigidly to the right. Through the study of the evolution law of shock wave velocity, the Lagrangian position and Lagrangian wave velocity of the right and left shock wave fronts are obtained respectively, and the conclusion that the right-traveling shock wave front has a constant deceleration is explained through rigorous theoretical derivation. Finally, the rationality of the division of shock wave front is verified. Numerical simulation based on 3D-Voronoi mesoscopic structure and local strain gradient method based on least square method can obtained a clear shock wave front at the interface, and the shock wave front propagation law of mesoscopic cellular material structure under high-speed impact can provide a reference basis for the safety design and research of the protection structures. |
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