某电动轻卡转向节臂断裂失效分析及优化

Analysis of the electric light truck steering knuckle arm rupture and structure optimum

文章就某电动轻卡转向节臂出现断裂问题,通过材质、力学性能检测及CAE结构强度分析,得出断裂主要原因在于节臂转弯处薄弱,发生疲劳断裂;对薄弱处进行加强优化,表面进行喷丸强化处理,疲劳寿命得到极大提升。经过疲劳试验及可靠性路试验证,优化措施切实有效。

The rupture of the electric light truck steering knuckle arm was analysed through material mechanical checking and finite element simulation.The result indicated that the insufficient strength of turning point in the arm was the principal cause of failure.Enlarging the weak structure and shot peening strengthening were applied to improve arm fatigue life.These optimization measures were proved excellent by practical experiments.