Abstract This paper presents a study of the elastic buckling behavior of Triangular Rollable And Collapsible (TRAC) booms under pure bending. An autoclave manufacturing process for ultra-thin composite booms is presented and the behavior of three test samples is investigated experimentally. Two regimes are observed, a pre-buckling regime and a stable post-buckling regime that ends when buckling collapse is reached. The buckling collapse moment, marking the end of the stable post-buckling regime, is typically four times higher than the initial buckling moment. A numerical simulation of the boom behavior with the Abaqus finite element package is presented and all of the features observed experimentally are captured accurately by the simulation, except buckling collapse. The numerical model is also used to study the effect of varying the boom length from 0.3 m to 5.0 m. It is shown that the pre-buckling deformation of the flanges under compression leads to a constant wavelength lateral-torsional buckling mode for which the critical moment is mostly constant across the range of lengths.

中文翻译：

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超薄可盘绕臂架的非线性弹性屈曲

摘要 本文研究了三角可滚动和可折叠 (TRAC) 吊杆在纯弯曲下的弹性屈曲行为。介绍了一种用于超薄复合材料臂架的高压釜制造工艺，并对三个测试样品的行为进行了实验研究。观察到两种状态，预屈曲状态和稳定的后屈曲状态，当达到屈曲坍塌时结束。屈曲倒塌力矩，标志着稳定后屈曲状态的结束，通常是初始屈曲力矩的四倍。介绍了使用 Abaqus 有限元包对动臂行为进行的数值模拟，并且除了屈曲倒塌之外，所有实验观察到的特征都被模拟准确捕获。数值模型还用于研究从 0.3 m 到 5.0 m 的动臂长度变化的影响。结果表明，法兰在压缩下的预屈曲变形导致恒定波长的横向扭转屈曲模式，其临界力矩在整个长度范围内几乎是恒定的。