中文摘要：

以含外倒角薄弱环节复合材料圆管的耐撞性分析为例，提出了基于理想弹塑性模型进行耐撞性设计分析的方法，并给出了等效参数的确定策略。研究表明：利用复合材料宏观力学理论计算得到复合材料圆柱壳的等效弹性常数，并结合有限元软件计算得到的临界屈曲应力，可以将复合材料圆管等效为各向同性材料圆管进行耐撞性设计分析；采用该数值模拟策略，能够以较少的计算量来预报复合材料圆管的耐撞性能，并使得在普通的计算机上进行全尺度复合材料飞行器结构的耐撞性设计分析成为可能。

英文摘要：

Taking composite circular tubes with an external-bevel trigger as an example, an analysis method for the design of crashworthy structures based on elastic-perfectly plastic model is proposed, and the tactics for the determination of equivalent parameters is provided. It is found that composite circular tubes could be equivalent as an isotropic circular tube for crashworthiness design analysis u- sing equivalent elastic constants obtained in terms of macroscopic mechanics of composite materials and critical buckling stresses calculated by finite element codes. It is also found that this numerical modelling strategy requires less computation burden to predict the crashworthiness of composite tubes, and makes it possible to perform the crashworthiness design analysis of full-scale composite air- craft structures with an ordinary personal computer.