Abstract

This research, which is a continuation of the previously published paper, develops the idea for estimating the behavior of axially crushed multicell thin walled structures. This approach employs new crushing mechanisms or simply crushing modes for different configurations of multiweb corner elements based on simulation, geometric, and kinematic observations. Furthermore, a new model is introduced named as “Induced Curvature Model” or ICM which includes the curvature of the sheet during progressive crumpling and also the hardening effect of the material under plastic deformation, instead of simple assumptions of perfect plastic material and hinge lines for the folds in case of previously offered plastic hinge model (PHM). Both ICM and PHM are employed to capture crushing properties based on the offered crushing modes and the results suggested by them are compared to each other. Different aspects of crushing behavior were studied and discussed. To show the validity of the proposed models, FE simulation studies were also conducted. Results show an average error around 7% which indicates a good agreement between theoretical and simulation findings and the applicability of the proposed novel model to a wide range of thin walled structures.

摘要

这项研究是先前发表的论文的延续，提出了估计轴向压碎的多单元薄壁结构行为的想法。这种方法基于模拟、几何和运动学观察，采用新的破碎机制或简单的破碎模式，用于多腹角元件的不同配置。此外，引入了一种称为“诱导曲率模型”或ICM的新模型，该模型包括渐进皱缩过程中板材的曲率以及塑性变形下材料的硬化效果，而不是简单的假设完美塑性材料和铰链线以前提供的塑料铰链模型 (PHM) 的情况下的折叠。ICM 和 PHM 都用于根据提供的破碎模式捕获破碎特性，并将它们建议的结果相互比较。研究和讨论了破碎行为的不同方面。为了证明所提出模型的有效性，还进行了有限元模拟研究。结果显示平均误差约为 7%，这表明理论和模拟结果之间的良好一致性以及所提出的新模型对各种薄壁结构的适用性。