Quantitative evaluation for influence of complex surface texture on fatigue reliability from meso-characteristics (3rd report, approximated calculation of stress concentration of 2-dimensional complex surface)

In this paper, the practical method to estimate the stress concentration factor (SCF) of two dimensional surface complex roughness is proposed. In the present method, the surface roughness is approximated with an infinite row of colinear notches which consists on "the local configuration" and "the average configuration". The SCF values of the notches are calculated independently, and the SCF of the surface roughness is obtained by the superposition of each SCF values. The application limit of the present method is examined with the exact or Finite Element Method (FEM) solution. Moreover, the problem of colinear row of arbitrary notches which are satisfied with the application limit is solved by the present method and FEM. Comparing the present solution with FEM solution, the validity of the present method is examined.