Method and device for predicting cross-scale fatigue life of floating friction plate

Abstract

The invention discloses a method and device for predicting the cross-scale fatigue life of a floating friction plate, and the method comprises the following steps: S1, setting a tooth-shaped equivalent sample, loading the load spectrum of the floating friction plate in the service process onto the tooth-shaped equivalent sample, and obtaining the tooth root stress state of the tooth-shaped equivalent sample through the analysis of a DIC analysis technology; s2, analyzing the tooth root stress state, and converting the tooth root stress state into a stress concentration equivalent parameter and a maximum principal stress by using a parameter formula; and S3, setting a standard sample, designing a plurality of groups of fatigue life experiments, and obtaining a fatigue life prediction model based on experimental results of the fatigue life experiments. According to the method, the accuracy of the prediction result is ensured through the experiment of the tooth-shaped equivalent sample, the simplicity and convenience of the experiment method are ensured through the experiment of the standard sample, and the unification of the accuracy and the simplicity and convenience is realized.

Description

technical field [0001] The invention relates to the technical field of life prediction of floating friction plates, in particular to a method and device for predicting cross-scale fatigue life of floating friction plates. Background technique [0002] Fatigue life prediction for floating friction plates is one of the key technologies for related engineering products to maintain structural integrity, reliability and stability in service. Classical fracture fatigue theory and a large number of fatigue experiments show that the root position of the floating friction plate is the main area for crack initiation due to stress concentration. Combining the theoretical analysis with the practical application of the floating friction plate, at least the following factors need to be considered in order to accurately predict the fatigue life of the floating friction plate: equivalent parameters of stress concentration, maximum principal stress, residual stress, roughness, stress Ratio,...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for predicting the cross-scale fatigue life of floating friction plates, so as to solve the problem of forced direct various types of fatigue life experiments in the prior art, which will also consume a lot of manpower, material resources and financial resources, but directly using standard samples for material-level experiments cannot take into account the stress state of the tooth root, resulting in technical problems of inaccurate prediction results

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