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Fatigue Life Analysis of Spot Weldment of Cold Rolled and High Strength Steel Using FEM  

Yu, Hyo-Sun (전북대학교 기계항공시스템공학부)
Yang, Sung-Mo (전북대학교 공업기술연구센터)
Kang, Hee-Yong (전북대학교 공업기술연구센터)
Kim, Hong-Gun (전북대학교 기계자동차공학과)
Kim, Kyu-Sang (전북대학교 공업기술연구센터)
Publication Information
Transactions of the Korean Society of Machine Tool Engineers / v.17, no.5, 2008 , pp. 58-63 More about this Journal
Abstract
Cold rolled and high strength steel were used for vehicle bodys to satisfy environmental regulation and improve fuel ratio. This paper presented a method far determining the fatigue life of cold rolled steel sheet EZNCEN and high strength steel sheet HS40R spot weldment used in vehicles. We can estimate the fatigue life of the spot weldments from the MSC/FATIGUE using the finite element method. The maximum load is found in the nugget part of both surfaces. The cold rolled steel and the high strength steel showed the maximum stress 746MPa and 730MPa in the effective nugget part when the weld current was 8KA and 7KA, respectively. Also the some weld current of the cold rolled steel and high strength steel is applied, the fatigue life of high strength steel is obtained about four times longer than the cold rolled steel.
Keywords
Cold rolled steel; Fatigue life; FEM; Spot weldment; High strength steel; Effective nugget;
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  • Reference
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