Application of the elastoplastic model of fatigue cracks growth for calculation of the residual resource of steps shafts

Abstract

Abstract By the example of a shaft loaded with bending and torsional moments, a method for estimating the residual life in the presence of a fatigue crack is presented. It is shown that a crack under conditions of complex loading in the process of growth is oriented normally to the greatest tensile stresses. The crack originates in the place of greatest stress concentration. Surface crack was modeled by the finite element method in the ANSYS Workbench program. It has been determined that after the initiation of a crack, a detail has a durability resource, which can be estimated by applying an elastoplastic model of fatigue crack growth.