Stress intensity factor-based Method for estimating fatigue damage degree of subsurface of bearing roller path

Abstract

The invention relates to a stress intensity factor-based method for estimating the fatigue damage degree of a subsurface of a bearing roller path. The method comprises the following steps of: S1. constructing a bearing model containing a material defect, and dividing a grid; S2. calculating a crack top stress intensity factor; S3. calculating an equivalent stress intensity factor; S4. determining a key hertz contact position; S5. determining a key depth of the material defect on the subsurface of the roller path; S6. determining KI (gamma), KII (gamma) and KIII (gamma) and the equivalent stress intensity factor Keff when H is equal to H0 and theta is equal to theta0; and S7. determining the crack growth rate or the crack growth angle. The method has the advantages of high efficiency, low cost, high practicability and the like based on a finite element analysis method; furthermore, by the method, the consumed time is short; the method can be combined with a test method, and a test can be instructed; and the test cost can be saved.

Description

technical field [0001] The invention relates to a method for analyzing the fatigue damage degree of the subsurface of the bearing raceway, more specifically, a method for evaluating the fatigue damage degree of the subsurface of the bearing raceway based on the stress intensity factor. Background technique [0002] The bearing raceway is usually subjected to pulsating contact stress cycles during the rolling process of the rolling elements, and a large concentration of stress is generated at material defect positions such as pores and inclusions. The pass surface refers to the area approximately several hundred microns deep below the raceway surface. The traditional crack initiation and propagation detection method is through the test method, that is, the use of material flaw detection to detect whether the subsurface of the bearing raceway has flaw detection, and record the relationship between the number of bearing operations and the crack length under different working co...

AI Technical Summary

Problems solved by technology

The traditional crack initiation and propagation detection method is through the test method, that is, the use of material flaw detection to detect whether the subsurface of the bearing raceway has flaw detection, and record the relationship between the number of bearing operations and the crack length under different working conditions. The method is time-consuming and expensive

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