NUMERICAL AND EXPERIMENTAL METHODS FOR ASSESSMENT OF FATIGUE CHARACTERISTICS OF MACHINE PARTS SUBJECTED TO MULTIAXIAL STRESSES

Abstract

Determination of fatigue characteristics of machine parts plays an important role in machine design calculation process. However, when machine parts are subjected to complex stress states, it is extremely complicated to directly determine their fatigue characteristics by traditional methods. In this article, the author presents the results of research and development of a numerical method that allows to calculate and investigate the fatigue strength of machine parts when subjected to complex stress and deformation states according to other criteria. At the same time, we present the results of experimental research to determine the fatigue strength of machine parts in a complex stress state with two different type of samples on the basis of using an electromagnetic shaker LDS. The results of numerical and experimental studies show that, when the machine parts are subjected to complex stress states, the analysis of its fatigue characteristics using the first principal stress method gives the largest error, while the critical plane method gives the most reliable results.