Crack propagation of composite material cylinder with metal liner based on the extended finite element method

Based on the extended finite element method (X-FEM), the stress intensity factors (SIFs) of different types of cylinder are calculated by the interaction integral method, the maximum circumferential tensile stress criterion is adopted to determine crack propagation direction, and crack propagation of composite material cylinder with metal liner is simulated. The numerical example of the pure metal cylinder shows the effectiveness of the presented method. The numerical example of crack propagation of composite material cylinder with metal liner is presented, and the crack propagation path is shown. Comparisons of SIFs among the pure metal cylinder, the pure carbon fiber reinforced plastic (CFRP) cylinder and the composite material cylinder with metal liner show that the pure metal cylinder is more likely to crack. Moreover, the effects of loads, crack lengths, and wall thicknesses on SIFs of composite material cylinder with metal liner are concluded that the increase of load, crack length and the decrease of wall thickness lead to the increase of SIF.