|
| Failure Analysis on Fracture of Automobile Leaf Spring |
| Received:March 15, 2021 Revised:May 12, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.11.018 |
| KeyWord:leaf spring failure analysis corrosion fatigue fracture |
| Author | Institution |
| ZHANG Yan-xia |
Southwest Institute of Technology and Engineering, Chongqing , China |
| WANG Chang-peng |
Southwest Institute of Technology and Engineering, Chongqing , China;Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing , China |
| GAO Li-qiang |
6th Military Agency Office of Army Armament Department, Chongqing, P.R.China, Chongqing , China |
| WANG Mao-chuan |
Southwest Institute of Technology and Engineering, Chongqing , China;Chongqing Engineering Research Center for Environmental Corrosion and Protection, Chongqing , China |
|
| Hits: |
| Download times: |
| Abstract: |
| This paper aims to investigate the fracture failure reasons of leaf spring for automobile. The fracture causes of automobile leaf spring were analysed by means of macroscopic analysis, metallographic examination, mechanical performance analysis, materials analysis, scanning electron microscopy and energy spectrum analysis.The results showed that the failure mode of the leaf springs for automobiles is fatigue cracking originating from high circumferential corrosion fatigue fracture at surface corrosion pits. First of all, the abnormal wear on the surface of the leaf spring lead to the partial peeling of the protective paint layer, the exposed metal substrate produced surface corrosion pits in the corrosive environment, the stress superposition of the external tensile stress and the stress at the bottom of the corrosion pit resulted in early fatigue cracks initiated at the bottom of the corrosion pits. Secondly, there is decarburization on the surface of the plate spring, which leads to the reduction of the surface hardness and strength of the plate spring and the reduction of the surface corrosion resistance, creating the conditions for the sprouting of early fatigue cracks. The conclusions are as follows:The quality of heat treatment can be controlled to avoid surface decarburization; regular maintenance should be carried out, and graphite lubricant should be added between the reeds to prevent the paint layer from falling off early due to long-term dry grinding or extrusion collision; The attached mud and water should be cleaned in time to reduce the corrosion probability; The leaf spring in use with hidden dangers should be replaced in time. |
| Close |
|
|
|