Simulation investigations of the position of Fatigue Fracture Plane in materials with biaxial loads

Abstract

Abstract In the paper three methods of determination of the expected fatigue fracture plane position under random triaxial stress state have been presented. They are: weight function method, variance method and damage cumulation method. The weight function method for biaxial cyclic loadings has been analysed with digital simulation. The fatigue fracture plane position has been determined with mean values of the direction cosines of principal stress axes. Averaging has been done at angle values with use of weights. Eleven various weights have been presented and their usability has been analysed on the basis of experimental results obtained by Rotvel , and Nishihara ‐ Kawamoto . The weights with good agreement of results of simulation tests and experiments have been shown.