Numerical study of the stress intensity factors for cracks in raceways with the experimentally determined interaction between crack faces

摘要

The paper presents the results obtained from numerical simulations of the process of rolling a loaded cylinder along a raceway with an oblique crack. The conditions of crack faces interaction were assumed based on the experimental results. The following two conditions of crack faces interaction were adopted: 1. Crack faces covered with layers of a worn out material, the mechanical properties of which were determined based on the results from experiments values of normal K{sub}(yy) and tangential K{sub}(xy) respectively, rigidities of the thin layer containing a crack. 2. Crack faces covered with microaspherities, which forced the crack dilatation accompanying the tangential displacements. The simulations have proved that introduction to the numerical model of the process the layers of a material of deteriorated properties as well as microroughness of the crack faces, results in substantial differences in the values of Stress Intensity Factors, which may affect the crack propagation.