Method for testing interlayer tensile strength of ceramic matrix composite material

Through four-point bending test and digital image-related technologies, the interlayer tensile strength of ceramic matrix composite materials is accurately measured, which solves the problem of difficult to determine the modulus in the prior art, improves the measurement accuracy, and meets the performance research needs of aerospace materials.

CN120489801APending Publication Date: 2025-08-15TIANJIN UNIV
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Patent Information

Application Number
CN202510706120.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-29
Publication Date
2025-08-15

AI Technical Summary

Technical Problem

When measuring the interlayer tensile strength of ceramic matrix composite materials, it is difficult to accurately determine the interlayer radial Young's modulus, resulting in unreliable or conservative measurement results, which cannot meet the needs of aerospace material performance research.

Method used

Using four-point bending test combined with digital image-related technology, the formula for calculating the radial to tangential Young's modulus ratio between layers is derived by obtaining the in-situ strain of the sample, and the camera is used to capture the sample displacement field to accurately measure the interlayer tensile strength.

Benefits of technology

The measurement accuracy of the interlayer tensile strength of ceramic matrix composite materials has been improved, and the problem of difficulty in determining the interlayer radial modulus is solved in direct experiments, which meets the needs of aerospace material performance research.

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Abstract

The invention discloses a method for testing interlayer tensile strength of a ceramic matrix composite material. Comprising the following steps: acquiring the geometric dimension of a sample, performing surface treatment on a test surface of the sample, marking a test section of the sample, acquiring the geometric dimension of a four-point bending clamp, determining a placement mode of the sample and a camera, and capturing a displacement field of the test surface of the sample by using the camera while performing a curved beam four-point bending test. Obtaining the load value and stroke of the first load drop, extracting the in-situ strain of the sample by using a camera, deducing a formula for calculating the interlayer radial and tangential modulus ratio of the sample, carrying out calculation, and calculating the interlayer tensile strength of the sample by using the existing formula. According to the method disclosed by the invention, the modulus ratio of the interlayer radial direction to the interlayer tangential direction is obtained by using in-situ strain, the problem that the interlayer radial modulus is difficult to accurately determine directly through the test is solved, and the accuracy of the interlayer tensile strength of the ceramic matrix composite material measured through the curved beam four-point bending test is improved.
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