门槛梁抗弯性能影响因素研究

Research on Influence Factors on Bending Performance of Threshold Beam

以某微型车门槛梁为研究对象,分析在侧面碰撞过程中的变形模式,确定薄弱截面。为便于对抗弯性能影响因素研究,将其等效简化为单帽梁。设计三点弯曲准静态试验,采用单一变量的方法,分析单帽梁的厚度、截面长宽比和材料对抗弯性能的影响规律。结果表明:薄壁梁内板厚度对抵抗弯曲所起的作用较小,薄壁梁的抗弯性能主要由外板厚度来体现,厚度越大,薄壁梁的抗弯性能越好。截面长宽比越小,所用材料的屈服强度越高,薄壁梁的抗弯性能越好。对后期门槛梁结构设计提供参考。

The threshold beam of a mini vehicle were selected as the research objects,the weak section of B-pillar is selected by analyzing its deformation mode during the side collision,which is simplified equivalently as single-hat thin-walled beam for the convenience of study of influence factors on bending performance of threshold beam.The three point bending test model is established study the influence of thickness,cross-sectional aspect ratio and material on bending behavior of single-hat beam by using a single variable method.The result are as follow:the thickness of inner plate of thin-walled beam has little effect on resisting bending,the bending resistance of thin-walled beams is mainly reflected by the thickness of outer panels.The greater the thickness is,the better the bending resistance of the thin-walled beam is.The smaller the section aspect ratio is and the higher the yield strength of the material is,the better the bending performance of the thin-walled beam is.Provide reference for the structure design of the threshold beam.