A grain size correction method for structural life analysis of aeroengine discs

Abstract

The invention relates to a method for correcting the sizes of crystal grains for analyzing the lives of wheel discs of aero-engines. The method has the advantages that metallographic analysis is carried out on standard test samples for sampling different positions, the average sizes of the crystal grains are introduced for correcting existing deterministic life models, and accordingly the prediction precision can be enhanced; probabilistic life models are built for test data of the standard test samples, and the dispersibility of the performance of materials can be quantitatively described; damage parameters of the deterministic life models are combined with the probabilistic life models, and the probabilistic life models corrected by the aid of the sizes of the crystal grains are built; life models are corrected by the aid of the introduced average sizes of the crystal grains on the basis of fatigue life models, and accordingly the prediction precision of the life models can be obviously improved; the deterministic life models corrected by the aid of the sizes of the crystal grains are further randomized, accordingly, the precision of deterministic life prediction results can be guaranteed, and the dispersibility of life data can be quantitatively described.

Description

technical field [0001] The invention belongs to the technical field of aerospace engines, and in particular relates to a grain size correction method for structural life analysis of an aeroengine wheel disc, which is a design method capable of considering the influence of the grain size on the wheel disc fatigue life. Background technique [0002] With the continuous development of aero-engine technology and the continuous improvement of aero-engine performance, the engine disc is subjected to higher and higher temperatures and mechanical loads. High reliability and economy. For example, the advisory bulletin AC33.14-1 of the FAA (Federal Aviation Administration) airworthiness provisions requires that the failure risk of a single component is less than 10 -9 times / flight cycle. Therefore, a comprehensive and accurate life reliability assessment for the wheel disc is a necessary means to improve the performance and ensure the safety of the engine. [0003] With the continu...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the problem of low prediction accuracy of the existing probabilistic life model, to provide a grain size correction method for the life analysis of the aero-engine wheel disc structure, and to ensure the accuracy of the deterministic life prediction result

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