关键词: 路谱载荷；副车架；疲劳损伤；nCode；案例

Abstract: The subframe is an important structural component between the body and the suspension, which carries the force and torque between the tire and the body, so the fatigue life, strength and stiffness of the subframe directly affect the safety and stability of the whole vehicle, and the fatigue life analysis and research of the subframe is an important task in the development of the subframe. Based on the fatigue damage analysis of the subframe of loop load, this paper first introduces the collection and damage analysis theory and analysis process of loop load, and uses Nastran solver and nCode analysis module to carry out fatigue damage analysis. Then, it focuses on how to optimize the fatigue damage of the subframe, and puts forward a series of optimization methods and cases. The analysis results show that the optimization method is effective and has an important guiding role for the structural design of subframe.

Key words: loop load; subframe; fatigue damage; nCode; case