Self-balancing interface bonding performance single shear test system and test method thereof

Abstract

The invention discloses a self-balancing interface bonding performance single shear test system and a test method thereof, wherein a support device comprises a double-running slide rail, a left support and a right support; an anchoring device is divided into a left anchoring device and a right anchoring device, the left anchoring device comprises a trolley with a baffle and a groove and a test block clamp, and the test block clamp is arranged in the groove of the trolley and can move back and forth; the right anchoring device comprises a self-anchoring box and a wedge-shaped clamp, the whole clamp is arranged in the self-anchoring box, and the self-anchoring box is fixed through a penetrating type rectangular plate; one end of a composite material is laid on the upper surface of a test block, and the other end horizontally extends into the wedge-shaped clamp in the right anchoring device; a force application device is a jack and applies a horizontal thrust to the trolley, so that a horizontal shear stress is formed on the bonding surface of a to-be-tested piece. According to the invention, the defect that the same stress on the two surfaces cannot be completely ensured in a double-surface shear test is overcome, and the whole test device is reasonable and simple in structure, is convenient to operate, is small in test error, is good in applicability and is reusable.

Description

technical field [0001] The invention belongs to the technical field of testing interface bonding performance, and in particular relates to a self-balanced interface bonding performance single-shear testing system and an implementation method. Background technique [0002] At present, the engineering field of using high-performance composite materials to strengthen structures is relatively extensive, and the interface bonding performance is one of the most important indicators of its performance testing. Only when the two have good bonding ability can the reinforcement effect be achieved. accomplish. [0003] In order to effectively measure the sliding distance between the composite material and the test block, and then effectively evaluate the interfacial bonding performance of the two, the existing testing methods mainly include double-shear test and single-shear test. The patent of publication number CN103776766A proposes a test method for the bond performance between bas...

AI Technical Summary

Problems solved by technology

The patent of publication number CN103776766A proposes a test method for the bond performance between basalt fiber cloth and concrete interface. The device makes the center lines of the two concrete test blocks on the same straight line, adjusts the eccentricity through the universal hinge, and then uses the universal joint to adjust the eccentricity. The test method is the loading test method of the material testing machine, but the test instrument of this device is not convenient to carry, which leads to the limitation of the test operation, and it belongs to the characteristics of the double-sided shear test. The force on both sides cannot be guaranteed to be exactly the same, which may easily cause large test errors. In the patent of publication number CN108088756A, a kind of experimental device and its application method for researching FRP (fiber reinforced composite material)-concrete interface bonding performance are proposed, and the device fixes the test piece by the single shear clamping plate and the positive tension clamping plate , realize vertical center loading, and conduct simple shear test and positive tension test respectively, but the through hole opened in the clamping plate of the device limits the size of FRP, and the positioning piece set on the single shear clamping plate also needs to be designed according to the size of the specimen, so The size of the test piece is limited and the applicability is not high. At the same time, the FRP sheet is easy to warp during the single shear test, and the bottom of the test piece is bonded to the sheet during the positive pull test. The sheet cannot be directly clamped on the testing machine. It needs to be clamped by the testing machine through the connecting piece, and there are factors that may cause large errors in the test results during the test

In addition, the above two inventive devices have not considered the influence of the friction force between the devices during the test.

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