Abstract

A type of tube with corrugated patterns, aiming at inducing extension deformation, was proposed in this paper. Fifteen patterned tubes and one conventional square tube were simulated using the finite element model which was validated by an axial quasi-static compression experiment. The numerical results show that four deformation modes generated, which are closely related to the patterns number and the pattern angle. Tubes deform in D mode has the highest energy absorption. The influence of geometric parameters and wall thickness on energy absorption performance was also investigated. A geometric optimization was carried out as well. Deformation mechanism of two of the four modes, EF mode and E mode, were established and theoretical predictions of mean force were derived. The energy absorptions of different deformation forms were analyzed, and the results show that half of the energy is dissipated by extension deformation in E mode but little in EF mode.

摘要

本文提出了一种具有波纹图案的管，旨在引起拉伸变形。使用有限元模型模拟了 15 个图案管和 1 个传统方管，并通过轴向准静态压缩实验进行了验证。数值结果表明，产生了四种变形模式，它们与花纹数量和花纹角度密切相关。在D模式下变形的管具有最高的能量吸收。还研究了几何参数和壁厚对能量吸收性能的影响。还进行了几何优化。四种模式中的两种，EF模式和E的变形机制建立了模式，并得出了平均力的理论预测。分析了不同变形形式的能量吸收，结果表明，在E模式下，一半的能量被拉伸变形所耗散，而EF模式下的能量很少。