On the Relation between the Probability of Failure and the Factor of Safety in the Design of Machine Parts under Repeated Load

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概要

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• On the assumption that the values of the fatigue limit of machine parts disperse following the law of normal distribution, though the working stress amplitude on those parts is maintained constant, the relation between the allowable stress or the factor of safety of a machine part, subjected to a repeated stress, and the probability of failure of the machine part was investigated. In order to clarify the relation, the data of the fatigue limit of notched specimens of any size collected by a committee in the Japan Society of Mechanical Engineers were utilized. Formulas to get the arithmetic mean of fatigue limit of machine parts were derived. The standard deviations and the coefficients of variance of fatigue limit of machine parts were also calculated. As the results, the factor of safety for any probability of failure was obtained just from the tensile strength of the material and the dimensions of the machine part.

• 一般社団法人日本機械学会の論文

著者

• Kawada Yuichi

  Metropolitan College Of Technology

関連論文

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• On the Relation between the Probability of Failure and the Factor of Safety in the Design of Machine Parts under Repeated Load

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