Method and system for evaluating damage tolerance of high-temperature pipeline under action of creep fatigue load

The invention relates to a method and a system for evaluating damage tolerance of a high-temperature pipeline under the action of creep fatigue load, and relates to the field of damage tolerance, the method comprises the following steps: establishing a pipeline finite element model containing cracks with different sizes, and carrying out numerical calculation to obtain a stress intensity factor of a crack tip in the pipeline; acquiring a crack propagation model and a pipeline crack size; determining the creep fatigue crack growth rate according to the pipeline crack size; calculating the crack propagation life according to the stress intensity factor and the creep fatigue crack propagation rate; determining fracture toughness according to the pipeline crack size; calculating the residual strength of the pipeline according to the fracture toughness and the pipeline crack size; and according to the crack propagation life and the residual strength, constructing a damage tolerance evaluation diagram of the high-t