Abstract：A new method to build finite element model of complex surface topography was proposed. Based on linear elastic mechanics, the stress concentration factors induced by surface topographies simulated by W-M fractal function were investigated under various degrees of measurement. The relations between fractal parameters, profile moments and stress concentration factors were analyzed. The results show that the stress concentration factor of fractal surface topography depend strongly on the resolution of the roughness-measuring instrument, the second profile moment can reflect the degree of stress concentration induced by surface topography, the high frequency cut-off should be determined to evaluate the effect of surface topography on structural fatigue behavior.
2015, Vol. 36 
