Estimation of the residual resource of a stepped shaft at fatigue cracks using numerical modeling
The article presents a methodology for calculating the residual resource of a shaft loaded with bending and torques in the presence of a fatigue crack. Based on the numerical simulation of elastic deformation by the finite element method of the shaft under consideration, a stress-strain state (SSS) is established at the crack tip. It is shown that a crack under conditions of complex SSS during growth grows normally to the highest tensile stresses. It was found that after the crack nucleation, the part has a strength resource, which can be estimated based on the application of the elastic-plastic model of growth of fatigue cracks.