A Fatigue Life Analysis and Judgment Method for Fusion Reactor Divertor

Abstract

The present invention discloses an analysis and judgment method for the fatigue life of a fusion reactor divertor. According to the method, firstly, a complex load applied onto a divertor in a service environment is converted into a temperature and stress-time changing course. Secondly, a series of cycle counting sections during an irregular stress course are subjected to the rain-flow counting treatment. Thirdly, for each counting section, an elastic stress range thereof is obtained according to a numerical analysis result. Fourthly, based on a stress-strain analysis formula, the stress result of the finite element elasticity analysis is converted into the total cycle strain range of the above counting section. Fifthly, according to the cycle strain fatigue life curve of materials, different stress levels are subjected to the quantization of the fatigue damage. Sixthly, a fatigue damage value corresponding to each cycle of each counting section during the stress course can be obtained. According to the technical scheme of the invention, a given service environment is subjected to result evaluation. Therefore, related protective measures and maintenance recommendations are provided, or improvement opinions are provided for the design of the divertor. As a result, an obtained evaluation result is more objective and more real for engineering practices.

Description

technical field [0001] The invention relates to the technical field of divertors of nuclear fusion devices, in particular to a method for analyzing and judging fatigue life of divertors of fusion reactors. Background technique [0002] As one of the most core internal components of a nuclear fusion device, the divertor's main function is to exclude the high heat flow and particle flow from the plasma. In fusion reactors, the evaluation of the reliability of the performance of the divertor and its damage or failure in the service environment can provide important reference information for the safe operation and maintenance of the device. [0003] At present, the research on the performance of the divertor mainly focuses on three aspects: (1) High thermal load test experiment. The service performance of the divertor under high thermal load can be effectively obtained by testing the experimental piece; at the same time, by analyzing the divertor module after the experiment, th...

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Problems solved by technology

Moreover, it is usually aimed at the evaluation without different load superposition effects or without considering the time accumulation effect, so it is impossible to fully evaluate the response and operating life of the divertor under service conditions

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