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A Study on Fatigue Characteristic of Connecting Rod Material for Automobile  

Kim, Hyun-Soo (Dept. of Nano System & Process Engineering, Pusan National University)
Park, In-Duck (Industry & Technology Div., Busan Metropolitan City Hall)
Kim, Chang-Hoon (Korea Materials & Components Industry Agency)
Kim, Tae-Gyu (Dept. of Nano System & Process Engineering, Pusan National University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.19, no.3, 2006 , pp. 163-169 More about this Journal
Abstract
Fretting is a kind of surface degradation mechanism observed in mechanical components and structures. The fretting damage decreases into 50-70% of the plain fatigue strength. The connecting rod for automobile has been used in special environments and various loading conditions. Failure of connecting rod in automotive engine may cause catastrophic situation. In this study, we investigated the fatigue characteristic of connecting rod material for an automobile. Fatigue life is defined as the number of cyclic stress to failure by regular cyclic stress. Fatigue life of C70S6 specimen was obtained from 134,000 to 147,000 cycles. Fatigue limit showed 432MPa by normal fatigue test. The other hands, it was 96MPa in the case of fretting fatigue test. It was extremely lower than that of a normal fatigue test. From observation of fracture surface, it was confirmed that the fatigue crack was initiated at the boundary of a specimen and bridge pad.
Keywords
Connecting rod; Fretting fatigue; Fatigue limit; Bridge pad;
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