Hitting the mark: probing at the initiation site allows for accurate prediction of a thin shell's buckling load
Hitting the mark: probing at the initiation site allows for accurate prediction of a thin shell's buckling load
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DOI：
10.1098/rsta.2022.0036
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发表时间：
2023-04-03
期刊：
影响因子：
5
通讯作者：
Rubinstein, Shmuel M.
中科院分区：
文献类型：
--
作者：
Cuccia, Nicholas L.;Kumar Yadav, Kshitij;Rubinstein, Shmuel M.
几何缺陷被理解为在薄壳的屈曲中起重要作用，但多个缺陷如何相互作用以控制失效的发生仍不清楚。在这里，我们研究失败的真实的圆柱壳的实验戳苏打罐与一个大的赋予酒窝。通过对罐的表面进行高速成像，直接观察到从轴向载荷开始的屈曲，揭示了较大的凹坑倾向于设置初始屈曲位置。然而，壳体的背景几何缺陷的影响仍然偶尔占主导地位，导致启动发生远离凹坑。在这种情况下，在凹坑处探测会导致轴向承载力的过度预测。使用有限元模拟，我们理解我们的实验结果之间的竞争的大凹坑和壳的固有缺陷结构。在我们的模拟中，我们经验性地观察到一个基于变形的标准，该标准将理想的戳击位置连接到起始位置。本文是主题问题“冲击敏感壳的探测和动力学”的一部分。
Geometric imperfections are understood to play an essential part in the buckling of a thin shell, but how multiple defects interact to control the onset of failure remains unclear. Here, we examine the failure of real cylindrical shells by experimentally poking soda cans with a large imparted dimple. By high-speed imaging of the can's surface, the initiation of buckling from axial loading is directly observed, revealing that larger dimples tend to set the initial buckling location. However, the influence of the shell's background geometric imperfections can still occasionally dominate, causing initiation to occur far from the dimple. In this situation, probing at the dimple leads to an over-prediction of the axial capacity. Using finite-element simulations, we understand our experimental results as a competition between the large dimple and the shell's inherent defect structure. In our simulations, we empirically observe a deformation-based criterion that connects the ideal poking location to the initiation site.This article is part of the theme issue 'Probing and dynamics of shock sensitive shells'.