Test device and method for testing composite material III fracture energy release rate

Abstract

The invention provides a test device for testing III type fracture energy release rate of composite materials. The device comprises two upper and lower torsion clamping devices, wherein the two torsion clamping device are symmetrically placed, and the upper torsion clamping device includes a top clamping end and an upper circular hole square plate; the lower torsion clamping device includes a bottom clamping end and an lower circular hole square plate, and the upper and lower circular hole square plates are arranged on the top clamping end and the bottom clamping end through fastening bolts respectively. Compared with the prior art, the device has the advantages of being simple in structure, convenient in maintenance and easy in sample shape processing, and can conveniently be matched with a torsion test machine to realize a pure III type fracture mode loading test with low costs and high loading precision.

Description

technical field [0001] The invention relates to the field of fracture testing of composite materials, in particular to a test device and method for testing the type III fracture energy release rate of composite materials. Background technique [0002] The application proportion of composite materials in load-bearing structures is increasing, which makes the stress state of materials more and more complex. Delamination failure is one of the common failure modes of composite laminates. Therefore, it is more and more necessary to study the delamination toughness of composite materials, especially the pure type III delamination fracture mode and theory, so as to ensure the safety of the material structure in use. [0003] At present, the basic performance testing technology of composite materials is relatively mature. Generally, it only needs to be loaded in a certain loading direction to obtain the uniaxial mechanical properties of the material. Common uniaxial test standards...

AI Technical Summary

Problems solved by technology

The experimental research of the above two modes is relatively easy to operate and obtain, while the pure type III (tear type) fracture test is difficult to achieve

In the test process of pure mode III fracture research, mode I and mode II fracture modes must be small enough to be ignored, but it is difficult to realize the test of pure mode III fracture mode in the existing technical means

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