半挂车车架多轴疲劳寿命研究

Fatigue Life Prediction of a Semi-trailer Frame using Mutiaxial Criterion

根据半挂车车架结构特点,建立了半挂车车架的有限元模型及多体动力学模型,对车架进行了静力学分析和以H级路面的路面载荷作为边界条件的动力学分析,得到了车架静态应力分布和载荷谱。并以此数据为依据,采用Wang-Brown多轴疲劳损伤模型预测了半挂车车架的多轴疲劳寿命,针对其疲劳薄弱部分提出了结构和工艺优化方案。优化后的车架满足使用寿命要求,且比原设计减重20%。

Based on structural features of semi-trailer frame, a finite element model and multi-body dynamic model for a semi-trailer frame are built on which a static analysis is carried out, and dynamic analysis is carried out with H- class road load as boundary condition, through which obtain static stress distribution and load spectrum of the frame. Then the fatigue life of the semi-trailer frame is predicated using Wang-Brown multiaxial fatigue damage model. For the fatigue weakness, structure and process optimization solution is proposed. The optimized frame satisfies requirement of service life, and has weight reduction of 20% compared with the original design.