加熱転がり接触を受ける被覆材表面複数き裂の干渉効果

抄録

This paper deals with the mutual interference of multiple two-dimensional surface cracks in a surface coating layered material under thermal stresses due to rolling contact with heat input. Contact loading is simulated as a contact pressure load with both the normal and shear components having parabolic distribution. In the present crack analysis, the surface cracks are replaced by the distributed edge dislocations, and the crack face friction is not considered. The problem is reduced to simultaneous singular integral equations for dislocation densities. The integral equations can be solved numerically by considering the nature of the singularities at the crack tips. The numerical results of the stress intensity factors showing the effects of the mutual interference of a pair of surface cracks are given for some tribological material coatings on a steel substrate. The effects of the frictional coefficient, the heat input strength, the crack length and the coating thickness upon the magnitude of the stress intensity factors and it's mutual interference are considered numerically.