변동하중시 정ㆍ동적 허용안전계수를 고려한 기계부품의 신뢰성 평가

An Estimating Reliability of Machine Elements Subjected to Fluctuating Load Considering Static and Dynamic Allowable Safety Factors

It is common to assume identical allowable safety factors in static strength defined by mean stress and in fatigue, defined by stress amplitude. Under the load with asymmetrical cycles the safety factor is not the same. In this paper, with the consideration of unequal allowable safety (actors a general method for estimating fatigue reliability of a machine element under a combined state of stress is derived based on the theory proposed by Prof. Kececioglu and a normal distribution. The calculation of fatigue reliability fur limited life is discussed with example.