In this paper, a method to predict the fracture toughness of thermally-aged CF8A under cyclic loading condition is proposed. The FE damage model based on multi-axial fracture strain energy is applied for the prediction. The predicted results are compared with the experimental data of C(T) specimens. The multi-axial fracture strain energy of unaged CF8A can be obtained from tensile and C(T) data under monotonic loading condition. Then, the multi-axial fracture strain energy of aged CF8A can be determined by introducing the concept of thermal ageing constant "C". From the determined multi-axial fracture strain energy of aged CF8A, the fracture toughness of aged CF8A is predicted under monotonic and cyclic loading condition. The predicted results show good agreement with experimental data.
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