Simulation and experiment investigation on leakage rate of composite materials with the consideration of curing defects

Abstract This study investigates the influence of curing defects on the leakage behavior of CFRP. A macroscopic homogeneous leakage model incorporating curing defects was developed to account for their impact on leakage. By combining simulation and experimental methods, the relationship between curing defects and leakage rates was analyzed. The results indicate a positive correlation between leakage rate and porosity. Furthermore, the leakage rate is also influenced by the void spacing, where an initial increase in spacing leads to a rise in leakage rate, followed by a stabilization at later stages. In addition, the leakage rate shows a negative correlation with both the distance between voids and the high‐pressure side, as well as the aspect ratio of the voids. Based on these findings, a defect morphology with enhanced leak resistance is proposed. Highlights A leakage simulation model for CFRP with void defects has been established. The mechanisms were investigated through simulation and experimentation. Revealed the influence of CFRP pore distribution and morphology on leakage rate. The void characteristics of CFRP with high leakage resistance were obtained.