Dynamic response of nacre-like structure under explosion load

被引：0

作者：

Li Z. ^{[1
]}

Lei J. ^{[1
]}

Liu Z. ^{[1
]}

机构：

[1] Institute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Shanxi, Taiyuan

来源：

Baozha Yu Chongji/Explosion and Shock Waves | 2022年 / 42卷 / 08期

关键词：

brick and mortar structure; explosion load; finite element simulation; toughening mechanism;

D O I：

10.11883/bzycj-2022-0145

中图分类号：

学科分类号：

摘要：

Shell nacre is a nature material with high strength and toughness, and the excellent performance is mainly derived from multi-scale, multi-hierarchy with “brick and mortar” structure. Inspired by the special structure of shell, a finite element model of nacre-like brick and mortar structures was created and the explosion experiment was carried out. In the experiment, the sample was destroyed catastrophically at the explosion impulse of 0.047 N·s, with the fall of the center. Additionally, shear failure existed around the clamping end of the specimen, which is in good agreement with the numerical simulation results. On this basis, the dynamic response of nacre-like brick and mortar models under explosive load was explored. Five different failure modes were analyzed, including: mode Ⅰ, inelastic deformation without damage; mode Ⅱ, partial damage with damage in the back surface; mode Ⅲ, through-wall failure in the center of specimen; mode Ⅳ, through-wall failure in the center of specimen and shear failure at the clamping end; mode Ⅴ, devastating damage with large drop through in the center and shear failure. The thresholds critical of different failure modes were obtained based on the simulation results. The threshold value for the one-layer brick and mortar structure was 0.019 N·s, and this value increased to 0.047 N·s for the five-layer brick and mortar structure. When the impulse exceeds the threshold value, catastrophic damage occurrs. The effects of the number of stacked layers on the response of the brick and mortar models were analyzed. With the increase of the number of stacked layers, the failure mode of the structure changes from devastating damage to inelastic deformation. Additionally, the threshold value for brick and mortar structure under explosion load increased with the increase of the number of stacked layers. Finally, the toughening mechanism of nacre-like brick and mortar structure was given, including crack deflection and microcrack. © 2022 Explosion and Shock Waves. All rights reserved.

引用

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