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양성모,강희용,김홍진,송준혁,島本聰 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.1
Evalution of fatigue strength on the spot welded part is very important for strength design of spot welded steel structures. In this paper, we could get the life cycle of the spot welded part using the lethargy coefficient obtained through the quasi-static tensile shear test for the specimen welded by current 10kA. The reliability evaluation of the life cycle is completed by comparing the life cycle calculated under the constant loading rate with the life cycle obtained by dynamic fatigue test. And then the result calculated by the lethargy coefficient is verified through the life cycle calculated using the dynamic final tensile stress formula under the increased loading speed. This say make save the time and cost in processing of predicting the lief cycle of a structure.