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首页> 外文会议>Asia-Pacific Conference on Shock amp; Impact Loads on Structures; 20031112-14; Changsha, Hunan,(CN) >COLLAPSE OF SQUARE METAL TUBES IN SPLITTING AND CURLING MODE
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COLLAPSE OF SQUARE METAL TUBES IN SPLITTING AND CURLING MODE

机译：分裂和卷曲模式下的方形金属管崩溃

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摘要

This paper presents a further investigation into the energy absorbing behaviour of axially splitting and curling square mild steel and aluminium tubes. Both quasi-static and dynamic tests were conducted. A simple quasi-static kinematic model is developed which describes all the main features of the process of tests. It is assumed in this model that cracks start from the four comers and propagate along the axial direction due to continuous fracture/tearing. The free side plates so formed by cracks roll up into four curls with a constant radius. Formulas for the average crush force, curl radius and the energy absorption are achieved by analysing the "far-field" and "near-tip" deformation events and the bending moment at the crack tip. This quasi-static model is also extended and used for dynamic cases to explore strain-rate effects in splitting square metal tubes. Solutions are presented and detailed comparisons are made between theoretical predictions and experimental results.
机译：本文对方形低碳钢和铝管的轴向分裂和卷曲的能量吸收行为进行了进一步研究。进行了准静态和动态测试。开发了一个简单的准静态运动学模型，该模型描述了测试过程的所有主要特征。在该模型中，假定由于连续的断裂/撕裂，裂纹从四个角开始并沿轴向扩展。这样由裂缝形成的自由侧板卷成具有恒定半径的四个卷曲。通过分析“远场”和“近端”变形事件以及裂纹尖端的弯矩，可以得出平均挤压力，弯曲半径和能量吸收的公式。该准静态模型也得到了扩展，并用于动态情况，以探索在分裂方形金属管中的应变率效应。提出了解决方案，并在理论预测和实验结果之间进行了详细的比较。

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