A kind of thermal fatigue test method

Abstract

The invention provides a thermal fatigue testing method which comprises the following steps: performing pre-testing, namely, selecting and preparing testing equipment, according to the properties of a pulse laser generator, selecting different parameters to form working modes which can meet thermal fatigue testing purposes, and recording temperature variation parameters of a test sample in the testing process in each working mode; performing thermal fatigue testing, namely, selecting testing equipment same as that of the pre-testing, selecting a corresponding working mode as working parameters of a current pulse laser generator according to a testing purpose, controlling the testing equipment to test an actual sample by a control unit, and terminating the thermal fatigue testing till cracks of provided lengths are generated on the surface of the actual sample; cleaning and analyzing the actual sample, and evaluating the thermal fatigue properties of the actual sample. By adopting the thermal fatigue testing method, the heating characteristics of pulse laser can be effectively utilized, reasonable parameter combination can be implemented by adjusting the parameters, and different circulation load modes in actual working situations can be achieved under laboratory conditions.

Description

technical field [0001] The invention relates to the field of thermal fatigue experiments of materials, in particular to a thermal fatigue experimental method which obtains all experimental realization modes through pre-tests and realizes irregular experimental processes. Background technique [0002] During the operation of the engine combustion chamber components, they are subjected to the action of cooling medium and high-frequency periodic high-temperature gas, accompanied by irregular low-frequency cycle changes of start-work-stop, and the thermal load they bear is a time-varying non-uniform temperature field. [0003] Existing thermal fatigue experiments directly select a heating method and fix a heating mode to heat the sample until the thermal fatigue experiment of the sample is completed. This heating mode cannot well reflect the temperature change process in the actual environment. Moreover, the irregular cooling and heating cycle in the actual environment cannot b...

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Problems solved by technology

[0003] Existing thermal fatigue experiments directly select a heating method and fix a heating mode to heat the sample until the thermal fatigue experiment of the sample is completed. This heating mode cannot well reflect the temperature change process in the actual environment. Moreover, the irregular cooling and heating cycle in the actual environment cannot be reproduced, resulting in large errors in the experimental results

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