Device and method for biaxial pull-press loading test device of material

Abstract

The invention provides a device for a biaxial pull-press loading test device of a material. The device consists of a clamping end (1), a loading press block (2), four inclined loading arms (4-1, 4-2, 4-3 and 4-4), two eudipleural stretching supporting seats (5-1 and 5-2), four chucks (8-1, 8-2, 8-3 and 8-4) and a base (7), wherein the two adjacent inclined loading arms on the left side are connected with a stretching supporting seat (5-1), the two adjacent inclined loading arms on the right side are connected with a stretching supporting seat (5-2), the two stretching supporting seats (5-1 and 5-2) are eudipleural, the inclined loading arms are upward connected with the loading press block (2) through top hinged supports (3-1 and 3-2) and are downward connected with the base through bottom hinged supports (6-1 and 6-2); the four chucks (8-1, 8-2, 8-3 and 8-4) are separately arranged on the loading press block (2), the two stretching supporting seats (5-1 and 5-2) and the base (7). Compared with the prior art, the device disclosed by the invention has the advantages that the structure is simple and convenient to maintain; the device can be conveniently matched with an uniaxial testing machine to realize a biaxial pull-press loading test, so that the test cost is reduced.

Description

technical field [0001] The invention relates to the field of complex load testing of composite materials, in particular to a device and method for biaxial tension-compression loading testing of 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 perform...

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 biaxial loading test of materials" (application number: 201110295955.0) and the invention patent "Biaxial tensile ratio adjustable "Extension fixture" (application number: 201510586604.3), but this type of device can only achieve biaxial tensile loading, and there are many connection structures, the actual implementation is more complicated; the invention patent "loading device for biaxial tensile test of materials and method" (application number: 201410536501.1) and the invention patent "loading device and method for material biaxial compression test" (application number: 201410536931.3). Although the structure is simple and easy to implement, this type of device can only achieve a fixed load ratio alone Biaxial tension and biaxial compression loading, unable to carry out biaxial tension-compression loading test

The second type of device is realized independently by two or more loading systems, such as the invention patent "a biaxial tensile test device" (application number: 201510005909.0) and the invention patent "small self-centering unidirectional loading biaxial tension and compression test "Device" (application number: 201210442034.7) (the size of the test piece and the loading limit realized by the invention are small, the scope of application is limited, and two loading motors are required), this type of test device is easier to achieve biaxial tension or compression at any ratio However, 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.

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