Loading device and method for material double-shaft compression test

Abstract

The invention relates to a loading device and a loading method for a material double-shaft compression test, and belongs to the field of composite material complex loading tests. The device consists of an upper Y-shaped compression device and a lower Y-shaped compression device which are placed in an intersecting manner symmetrically with openings faced; the upper Y-shaped compression device (1) comprises a first loading arm (1-1), a second loading arm (1-2) and a top clamping end (1-3); the lower Y-shaped compression device (2) comprises a third loading arm (2-1), a fourth loading arm (2-2) and a bottom clamping end (2-3); right angles are formed between the first loading arm (1-1) and the second loading arm (1-2) and between the third loading arm (2-1) and the fourth loading arm (2-2); and the top clamping end (1-3) and the bottom clamping end (2-3) are respectively positioned on a bisector of the right angle. In comparison with the prior art, the device is simple to construct and convenient to maintain, double-shaft compression loading test can be realized by matching an all-purpose tester conveniently, and the testing cost is lowered.

Description

technical field [0001] The invention relates to a loading device and method for a material biaxial compression test, belonging to the field of complex load testing 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. Therefore, it is more and more necessary to study the strength characteristics of composite materials, especially the failure characteristics under biaxial stress or multiaxial stress state, so as to ensure the safety of material structures in use. [0003] At present, the uniaxial 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 materials. Common uniaxial test standards for composite materials can be found in GB / T 1447-2005 (static Tensile performance test) and GB...

AI Technical Summary

Problems solved by technology

The first type of device mainly uses a certain mechanical structure to achieve biaxial loading, such as the invention patent "a test device for bidirectional loading test of materials" (authorization number CN102353578B), but this device can only achieve biaxial tensile loading, and There are many types of connection structures, and the actual implementation is more complicated

The second type of device is realized independently by two or more loading systems (see the literature "Cai Dengan, Zhou Guangming, Wang Xinfeng, et al. Research progress on biaxial strength of fiber reinforced composite materials. Aerospace Materials Technology, 2014, (4): 11-18. ”), this kind of test device is easier to realize biaxial tension or compression test of any ratio, but due to the complex structure of the test equipment, high cost, and high requirements for the control system, the application of this method is limited to a certain extent. restricted

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