Calculation of Crack Stress Intensity Factors and Crack Propagation in Coating

Because of the high hardness and low crack-resistance of spray material,and the high rigidity of spray workpieces,and the stress convergence on the coating surface,cracks tend to result on the coating.To the initial spray material with a crack,the propagation path of the crack in the material under tensile load has much to do with the stress intensity factor.According to the basic principle of the fracture mechanics,this paper proposes the numerical method to calculate the stress intensity factor of the crack tip,discusses the effect of crack front grid partition on stress intensity,and predicts the shape changes during the propagation of crack.