Numerical Study Of Effect Of Coating Materials On Fracture Of V-notch

Based on the fracture criterions of the maximum circumferential stress, stress intensity factor and strain energy density factor of V-notch, the maximum circumferential stress, stress intensity factor and strain energy density factor of V-notch which is added a coating under mode I and mode II are analyzed using the numerical method. By changing the thickness and elastic modulus of the coating, the effect of the coating on the maximum circumferential stress, stress intensity factors and strain energy density factor of V-notch is obtained, so we can discuss the effect of the coating on the fracture of the V-notch. The stresses and stress intensity factors of the V-notch with different splay angles are also analyzed and the effect of the thermal barrier coating with two layers on stress near V-notch tip is discussed.The numerical results indicate that as the elastic modulus of the coating materials is increased, both the maximum circumferential stress and stress intensity factors near notch tip are increased, but the strain energy density factor is decreased; As the thickness of the coating is increased, the maximum circumferential stress and stress intensity factors are decreased, but the strain energy density factor is increased. The stresses near the notch tip are sensitive to the spay angle of the notch with the coating. For the thermal barrier coating with double layers, the maximum circumferential stress is larger in the area where the elastic modulus is larger, In the interface where the difference of thermal expansion coefficients of two materials is larger, the saltation of the maximum circumferential thermal stress is larger.