动车组铝合金车体耐撞性研究

项目名称： 动车组铝合金车体耐撞性研究

项目编号： No.51275532

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 姚松

作者单位： 中南大学

项目金额： 72万元

中文摘要： 碰撞仍然是动车组面临的主要事故风险之一，其耐撞性受到世界各国高度关注。项目从研究车身中空铝合金焊接构件大变形力学特性、失效模式入手，通过大量的准静态、台车冲击实验研究及各种力学参数测定，采用有限元反求法建立可以描述铝合金材料在不同应变速率下变形的本构关系及其微观结构损伤演化破坏规律。通过高精度数值仿真确定撞击力-变形行程表征的车体非线性力学特性，建立整列车多体弹-塑性混合三维冲击动力学模型，研究多车辆耦合撞击条件下"爬车"现象与纵向冲击力水平、冲击速度等因素的相关性，确定"爬车"的临界速度，并提出防爬措施；分析两列车在特定碰撞场景下的动力学响应，评估动车组铝合金车体的耐撞性能。

中文关键词： 动车组；铝合金；冲击；耐撞性；动态

英文摘要： Collisions accidents are still the main threaten for high speed trains. Structure crashworthiness is highly focused in the world. The project plans to investigate large deformation mechanic characteristic of aluminium welding structures and failure mode under impact. Through a lot of static and semi-static and impact tests, several mechanic parameters will be measured. Utilizing finite element reverse solution algorithm, consititution equations to describe aluminium alloy structure damage and evolution regulation are obtained. By high resolution numerical analysis, non-linear mechanic feature of car-body is represented by impact versus deform distance curve. On the basis, a three-dimensional elatic-plastic model for a whole trains will be built up. Furthermore, relevence is found between overriding phenomenon and impact velocity and longitudinal impact level. So the critic impact velocity can be decided and measures to prevent overriding will be proposed. Finally a full collision process will be analysed on specific scene. The results will be used to evaluate the crashworthiness level of high speed trains made of aluminium alloy.

英文关键词： EMU；aluminium；impact；crashworthiness；transient