Polymer matrix composite material shear fatigue test tool

By designing a shear fatigue testing fixture for polymer-based composite materials, the problem of load eccentricity in the shear fatigue test of composite materials was solved, and stable shear fatigue testing was achieved, which is applicable to shear fatigue testing of composite materials under different stress ratios.

CN223597361UActive Publication Date: 2025-11-25AECC COMML AIRCRAFT ENGINE CO LTD
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Patent Information

Application Number
CN202520261340.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-18
Publication Date
2025-11-25
Estimated Expiration
2035-02-18

AI Technical Summary

Technical Problem

Existing composite material shear fatigue testing equipment cannot perform shear fatigue testing, and load eccentricity is prone to occur during loading, causing specimen torsion and affecting test results.

Method used

A shear fatigue testing fixture for polymer-based composite materials was designed, including an upper device connection structure, a lower device connection structure, a rigid connecting rod, a panel, a base plate, an upper clamp for the specimen, and a lower clamp for the specimen. Through the design of the rigid connecting rod and the vertical guiding mechanism, the central axis of the specimen is kept unchanged during the shearing process, providing a stable tensile or compressive load and avoiding eccentric loading of the specimen.

Benefits of technology

It achieves stability and accuracy in shear fatigue testing of composite materials, avoids specimen distortion during the testing process, and enables fatigue tests with stress ratios R=0.1 and R=-1, thus improving the reliability and repeatability of test results.

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Abstract

The embodiment of the utility model provides a shear fatigue test tool for a polymer-based composite material, and relates to the technical field of performance test of composite material fan blade materials. The problem that a composite material fan blade material characteristic detection tool clamp can only provide one-way compression loading is solved. The device comprises an upper equipment connecting structure, a lower equipment connecting structure, a rigid connecting rod, a panel, a base plate, a sample upper chuck and a sample lower chuck, wherein the top end of the rigid connecting rod is detachably fixed with the upper equipment connecting structure; the panel is fixed with the bottom end of the rigid connecting rod, the base plate is fixed with the lower equipment connecting structure, the sample upper chuck is fixed with the panel, the sample lower chuck is fixed with the base plate, and the height distance between the panel and the base plate is adjustable, so that the sample upper chuck and the sample lower chuck do reverse movement in the height direction. In the process of stretching or compressing the rigid connecting rod, the rigid connecting rod can keep the central axis unchanged all the time, so that the sample is prevented from being eccentrically loaded and distorted.
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