A method for predicting crack opening displacement of fiber-reinforced ceramic matrix composites considering fiber breakage

Through a prediction method that considers fiber breakage, the crack opening displacement of fiber reinforced ceramic matrix composites is predicted by using load bearing criteria, interface debonding criteria, shear hysteresis model and slip mechanism, which solves the problem that the impact of fiber breakage in the prior art is not considered, and improves the accuracy of prediction and the reliability of the material.

CN114139384BActive Publication Date: 2025-03-28NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Application Number
CN202111465594.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-12-03
Publication Date
2025-03-28
Estimated Expiration
2041-12-03

AI Technical Summary

Technical Problem

The prior art has not yet established a method for predicting crack opening displacement of fiber reinforced ceramic matrix composite materials that consider the influence of fiber fracture, which makes it difficult to ensure the reliability and safety of materials when used in aircraft and aircraft engine structures.

Method used

A method for predicting the crack opening displacement of fiber-reinforced ceramic matrix composite material that considers fiber fragmentation is provided. Through the overall load bearing criteria, fracture mechanical interface debonding criteria, shear hysteresis model and fiber relative matrix slip mechanism, the fiber axial stress distribution, matrix axial stress distribution, fiber axial displacement and matrix axial displacement are determined at the crack plane, and finally predict the axial relative displacement of fiber and matrix at the crack plane.

Benefits of technology

The accuracy of crack opening displacement prediction of fiber-reinforced ceramic matrix composite materials is improved, and the impact of fiber breakage factors on the crack opening displacement of material is considered, which enhances the reliability and safety of the material in high temperature and high stress environments.

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Abstract

The present invention provides a method for predicting crack opening displacement of fiber-reinforced ceramic matrix composite materials taking into account fiber breakage, and belongs to the technical field of composite material crack opening displacement prediction. The method for predicting crack opening displacement of fiber-reinforced ceramic matrix composite materials taking into account fiber breakage provided by the present invention first determines the load borne by the intact fiber at the matrix crack according to the overall load bearing criterion, and then obtains the interface debonding length considering fiber breakage according to the fracture mechanics interface debonding criterion, and on this basis obtains the fiber axial stress distribution equation and the matrix axial stress distribution equation at the matrix crack, and accordingly obtains the fiber axial displacement and the matrix axial displacement at the matrix crack, and on this basis determines the opening displacement of the matrix crack. The method provided by the present invention takes into account the influence of the fiber breakage factor on the crack opening displacement of the fiber-reinforced ceramic matrix composite material, and improves the accuracy of the crack opening displacement prediction of the fiber-reinforced ceramic matrix composite material.
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