Experimentally probing the stability of thin-shell structures under pure bending

理论(学习稳定性) 材料科学 壳体(结构) 弯曲 纳米技术 化学物理 复合材料 物理 计算机科学 机器学习
作者
Fabien Royer,Sergio Pellegrino
出处
期刊:Philosophical Transactions of the Royal Society A [Royal Society]
卷期号:381 (2244) 被引量:2
标识
DOI:10.1098/rsta.2022.0024
摘要

This paper studies the stability of space structures consisting of longitudinal, open-section thin-shells transversely connected by thin rods subjected to a pure bending moment. Localization of deformation, which plays a paramount role in the nonlinear post-buckling regime of these structures and is extremely sensitive to imperfections, is investigated through probing experiments. As the structures are bent, a probe locally displaces the edge of the thin shells, creating local dimple imperfections. The range of moments for which the early buckling of the structures can be triggered by this perturbation is determined, as well as the energy barrier separating the pre-buckling and post-buckling states. The stability of the local buckling mode is then illustrated by a stability landscape, and probing is extended to the entire structure to reveal alternate buckling modes disconnected from the structure’s fundamental path. These results can be used to formulate efficient buckling criteria and pave the way to operating these structures close to their buckling limits, and even in their post-buckling regime, therefore significantly reducing their mass. This article is part of the theme issue ‘Probing and dynamics of shock sensitive shells’.
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