Failure Analysis of Shock Absorption Spring in Motorcycle
In the process development of a new spring for shock absorption in motorcycles, fatigue resistance cannot always reach the design standard. Spring fractures were sent to the author for failure analysis to identify reason behind and proposals for improvements were expected. Based on information from the spring manufacturer and spring fracture analysis, the reason for earlier breakage than design standard was determined to be process flaws. More specifically insufficient shot peening and embrittlement induced from electroplating were observed. This has been demonstrated by experimental results from an uncoated spring. A process optimization was proposed, and now, spring fatigue life has reached the design standard with the optimized process.
KeywordsShock absorption spring Failure analysis Shot peening Embrittlement
The authors would like to thank Yu An Shock Absorber Co., Ltd. for providing the information and samples for analysis.
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