截面尺寸对B柱抗弯性能影响研究

Influence of Section Size on Bending Performance of B-pillar

在B柱截面尺寸对抗弯特性影响的研究分析中,其结构的复杂性给试验与仿真模型参数的修改增加难度和成本.针对此问题,选取某微型车B柱作为研究对象,将其等效简化为单帽形薄壁梁,并验证模型的有效性.为研究不同截面长宽比的单帽形薄壁梁的抗弯性能,对单帽型薄壁梁样件进行了准静态三点弯曲试验与仿真、动态三点弯曲试验与仿真,以及将准静态与动态三点弯曲试验进行对比分析.结果表明,动态三点弯曲试验下得到的规律与准静态试验相同,即截面周长一定的情况下,单帽梁的截面长宽比越小其抗弯性能越强.

In the research and analysis of the influence of B-pillar section size on bending characteristics, the complexity of the structure increases the difficulty and cost to the modification of the experimental and simulation model parameters. In order to solve this problem, a B- pillar of a miniature vehicle was selected as the research object to simplify its equivalent to a single-hat thin-walled beam, and the validity of the model was verified. In order to study the bending resistance of single-hat thin-walled beams with different aspect ratios, quasi-static three-point bending tests and simulations, dynamic three- point bending tests and simulations, and comparative analysis of quasi- static and dynamic three-point bending tests were carried out on single- cap thin-walled beams.. The results show that the law obtained under the dynamic three-point bending test is the same as that under the quasi- static test, i.e. the smaller the section length-width ratio of the single-cap beam is, the stronger its bending resistance is.