论文部分内容阅读
为了设计四模块低地板有轨列车耐撞性车体防撞装置,实现列车被动安全保护,采用数值仿真技术进行准静态和动态压缩计算,研究不同孔隙率下泡沫铝防撞块的吸能特性。研究结果表明:泡沫铝防撞块准静态压缩的压溃力呈现明显的弹性阶段、稳定压溃阶段和致密化阶段;泡沫铝防撞块的压溃力和吸收的能量随着孔隙率的减小而增加;同一孔隙率下,动态压缩过程初始压溃力的变化趋势与准静态压缩的压溃力大致相同,而随着泡沫铝的压实,准静态压缩的压溃力呈线性增大。
In order to design four-module low-floor railcar crashworthiness body collision avoidance device to achieve passive safety protection train, numerical simulation technology for quasi-static and dynamic compression calculations to study the foam porosity aluminum foam impact energy absorption characteristics . The results show that the compressive force of the quasi-static compression of the aluminum foam bumper exhibits a distinctly elastic stage, a steady collapse stage and a densification stage. The compressive strength and absorbed energy of the foam bumper with decreasing porosity The trend of initial compressive force in dynamic compression is almost the same as that of quasi-static compression under the same porosity, while the compressive force of quasi-static compression increases linearly with the compaction of aluminum foam .