某房车用少片簧断裂原因OA

During the reliability road test of a certain touring car,it was found that the less-leaf spring had broken.The cause of the fracture of the less-leaf spring was anlayzed by macroscopic observation,chemical composition analysis,hardness testing,metallographic examination,scanning electron microscopy analysis.The results show that there were local folds on the surface of the less-leaf spring.During the road test,stress concentration was generated on its surface,which promoted the initiation and propagation of cracks,ultimately led to the fracture of the less-leaf spring.