Experimental studies on snaking in 3D-printed cylindrical shells under axial compression using photogrammetry

IF 2.9 3区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences Pub Date : 2024-01-31 DOI:10.1098/rspa.2023.0631
V. Ravulapalli, G. Raju, V. Narayanamurthy
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Abstract

The buckling instability of cylindrical shells under axial compression has been one of the most renowned problems in structural engineering for several decades. Many pioneering works in the twentieth century have provided insights into understanding the shells’ infamous imperfection sensitivity and led to reliability-based designs. However, a recent surge in numerical studies of the snaking phenomenon explores the development of a localized stable post-buckling mode in axially compressed cylindrical shells. Hitherto, none of the experimental studies report on the evolution of azimuthal snaking. In this work, experimental studies are carried out with the objective of revealing the snaking phenomenon. The axial compression experiments are performed on 3D-printed shells made of thermoplastic polyurethane (TPU). The work’s novelty lies in the usage of TPU shells for slowing down the propagation of circumferential dimples and making it feasible to capture them using photogrammetry. Despite the match between the experimental and numerical mode shapes, the experiments reveal multiple routes for the snaking sequence. Furthermore, mode transitions such as reduction in circumferential wave number and transformation of symmetric mode into an asymmetric one are observed. These experimental results provide insights into the localized phenomenon of snaking and validate numerical solutions.
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利用摄影测量法对轴向压缩条件下 3D 打印圆柱形外壳中的蛇行现象进行实验研究
几十年来,圆柱形壳体在轴向压缩下的屈曲不稳定性一直是结构工程领域最著名的问题之一。二十世纪的许多开创性工作为了解壳体的缺陷敏感性提供了见解,并促成了基于可靠性的设计。然而,最近对蛇形现象的数值研究激增,探索了轴向压缩圆柱壳的局部稳定后屈曲模式的发展。迄今为止,还没有任何一项实验研究报告了方位蛇行的演变过程。在这项工作中,为了揭示蛇行现象,我们进行了实验研究。轴向压缩实验是在热塑性聚氨酯(TPU)制成的 3D 打印外壳上进行的。这项工作的新颖之处在于使用热塑性聚氨酯外壳来减缓圆周凹痕的传播,并使使用摄影测量捕捉凹痕成为可行。尽管实验和数值模式形状相吻合,但实验揭示了蛇形序列的多种路径。此外,还观察到模式转换,如圆周波数减少以及对称模式转变为不对称模式。这些实验结果提供了对局部蛇行现象的见解,并验证了数值解决方案。
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来源期刊
CiteScore
6.40
自引率
5.70%
发文量
227
审稿时长
3.0 months
期刊介绍: Proceedings A has an illustrious history of publishing pioneering and influential research articles across the entire range of the physical and mathematical sciences. These have included Maxwell"s electromagnetic theory, the Braggs" first account of X-ray crystallography, Dirac"s relativistic theory of the electron, and Watson and Crick"s detailed description of the structure of DNA.
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