Three-point/four-point bending fatigue test method and device for composite material

Abstract

The invention provides a three-point / four-point bending fatigue test method and device for a composite material. The device comprises an upper loading roller which is used for restraining the verticalupward normal deviation of a test piece in a loading direction, a lower supporting roller which is used for constraining the vertical downward normal deviation of the test piece in the loading direction, a transverse baffle which is used for restraining transverse deviation of the test piece in the length direction, a side baffle plate which is used for restraining the longitudinal deviation of the test piece along the width direction and fixing the upper loading roller and the lower supporting roller at the same time, a lower supporting base which is used for supporting the lower supportingroller, a lower supporting block which is arranged between the lower supporting base and the lower supporting roller, and is used for changing the distance between the lower supporting roller and theupper loading roller by changing the size of the lower supporting block, a lower bottom plate which is used for supporting the lower supporting base and the transverse baffle, and a displacement meterwhich is fixedly connected to the lower bottom plate. The bending deformation of the test piece is measured through the displacement meter.

Description

【Technical field】 [0001] The invention relates to the technical field of material performance testing, in particular to a composite material three-point / four-point bending fatigue test method and device. 【Background technique】 [0002] Composite materials have the advantages of high specific strength and high specific stiffness, strong designability and good fatigue performance. Its bending performance is also a performance that needs to be considered in the design and use of composite materials. However, the existing three-point / four-point bending static test fixtures for composite materials lack the normal direction of the loading direction and the boundary constraints along the length direction of the specimen, and cannot restrain specimens of different sizes. Out-of-plane and lateral slippage will occur, resulting in changes in the loading position of the test piece, and the accuracy of the test results cannot be guaranteed. [0003] In the prior art composite material...

AI Technical Summary

Problems solved by technology

However, the existing three-point / four-point bending static test fixtures for composite materials lack the normal direction of the loading direction and the boundary constraints along the length direction of the specimen, and cannot restrain specimens of different sizes. Out-of-plane and lateral slippage will occur, resulting in changes in the loading position of the test piece, and the accuracy of the test results cannot be guaranteed

[0003] In the prior art composite material test, the three-point / four-point bending fatigue test fixture of the sandwich structure is mostly carried out by the static test test fixture; for the three-point / four-point bending fatigue test with special requirements, the special fixture is used for the test, and it is impossible Guarantee the accuracy of test results

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