Reserve estimate of strength of machine parts subject laden with asymmetrically

Abstract

Creation of engineering structures is closely related to the need of improving the methods for strength calculation. This task is es­pecially relevant with regard to the parts subject to cyclic loadings, causing premature failure as a result of the development of the metal fatigue process. In this regard, it is important to develop the research aimed at finding adequate model approximations that describe the interrelation of durability of a construction material with the range of loading conditions and the number of structural features of parts made of it. The method of calculating the safety margin of parts of engineer­ing structures subject to the combined effects of static and cyclic loadings is considered in this paper. The focus is on assessing the maximum limit stresses characteristic of the asymmetric loading of structural materials, taking into account the stress concentration as one of the main factors inherent in real structural elements. The proposed approach provides more correct calculation of the margin of safety in the implementation of design works. Thus, the research results given in this paper are of both sci­entific and practical interest. The authors proposed a method for assessing the margin of safety of constructional materials subject to asymmetric cyclic loading, based on the previously developed models of the limit state based on the use of power transcendental functions.