[구조강도부문] 단순인장시험에 의한 볼트결합부의 피로수명 결정

Mechanical fastened joints are widely used for joining structural parts. In estimating the reliability of the bolted joint, the prediction of failure life is the most important failure mode to be considered. This paper presents a method for determining the fatigue life of bolted SAPH45 steel structures used extensively in truck vehicle frames. First the fastening torque on bolted joints in the structure is determined by a vibration test. Under such torque, the stress distribution factor is based on the consideration of the failure characteristics from the tensile test and the fatigue life of the bolted joint is predicted using lethargy coefficient as total defect estimation coefficient.