Abstract
The study of fracture failure is very important for analyzing the fatigue life of pressure vessels. According to the Paris Law, the relationship between fatigue-crack size and residual fatigue life is established by considering the circumferential stress and the relationship between crack length and the crack depth. Based on the specific structure of the pressure vessel, the relationship between fatigue-crack size and the residual strength was established according to the permissible residual strength. The curve for stress vs. number of cycles (S–N) of a pressure vessel was obtained. The fatigue life of the pressure vessel was predicted and compared with actual test data. The accuracy of the model was verified by comparing the actual service life with the model predictions, which confirmed that this model provides a new method for predicting the residual life of pressure vessels.
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