城市轨道交通车辆用不锈钢蜂窝应变率敏感性研究
陈佳明朱涛肖守讷丁浩谞阳光武杨冰
Strain Rate Sensitivity of Stainless Steel Honeycomb for Urban Rail Transit Vehicle
CHEN JiamingZHU TaoXIAO ShouneDING HaoxuYANG GuangwuYANG Bing
-
作者信息:西南交通大学牵引动力国家重点实验室, 610031， 成都
-
Affiliation:State Key Laboratory of Traction Power, Southwest Jiaotong University, 610031, Chengdu, China
-
关键词:
-
Key words:
-
DOI:10.16037/j.1007-869x.2023.09.021
-
中图分类号/CLCN:U270.41;O347.3
-
栏目/Col:研究报告
摘要:
目的：不锈钢蜂窝具有较大的额定吸能容量，可以作为车辆端部的吸能材料，现已应用于车辆防爬器的吸能区，因此需研究应变率效应对不锈钢蜂窝动态冲击性能的影响。方法：以304不锈钢为基体材料，建立了不锈钢蜂窝异面压缩数值模型。采用两种不同规格的不锈钢蜂窝进行仿真建模，并结合不锈钢蜂窝的准静态压缩试验，验证模型的有效性。基于不锈钢蜂窝有限元模型，分析应变率效应对不锈钢蜂窝结构压溃应力、吸能和不锈钢蜂窝变形模式的影响。结果及结论：304不锈钢材料具有明显的应变率强化效应；考虑应变率效应的压溃应力位移曲线较为光滑，与文献中的试验所得的曲线更接近；考虑应变率效应后，不锈钢蜂窝的峰值压溃应力和平均压溃应力明显增大，最大压缩位移和理想吸能效率有所减少；304不锈钢材料的应变率效应会使蜂窝结构形成塑性铰所需的应变增大，进而影响其变形模式。
Abstracts:
Objective: Stainless steel honeycomb (abbreviated as SSH) has a large rated energy absorption capacity and can be used as energyabsorbing material for vehicle end, and is applied in the energyabsorbing zone of vehicle anticlimbers. Therefore, it is necessary to study the influence of strain rate effects on the dynamic impact performance of SSH. Method: Using 304 stainless steel as the base material, a numerical model of SSH under heterogeneous compression is established. Two different specifications of SSH are simulated and modeled. The model validity is verified through quasistatic compression tests of SSH. Based on the finite element model of SSH, the influence of strain rate effect on the crush stress, energy absorption, and deformation mode of SSH structure is analyzed. Result & Conclusion: The 304 stainless steel material exhibits obvious strain rate strengthening effect. The crush stressdisplacement curve considering strain rate effect is smoother and more similar to the curves obtained from experimental tests in the literature. With the consideration of strain rate effect, the peak crush stress and average crush stress of SSH increase significantly, while the maximum compression displacement and ideal energy absorption efficiency decrease. The strain rate effect of 304 stainless steel material leads to an increase in the required strain for the formation of plastic hinges in the honeycomb structure, thus affecting its deformation mode.
- 上一篇: 接触网巡检系统空间综合定位方法
- 下一篇: 盾构隧道破损管片修复竖井回填过程中的荷载分布规律
过刊浏览
资料下载
友情链接