Equal biaxial tensile test device

Abstract

The invention relates to an equal biaxial tensile test device. The device includes a support plate used for placing a test piece, a plurality of connection mechanisms connected with the test piece and a plurality of traction discs connected with the connection mechanisms. Each connection mechanism includes a clamping unit, a driving unit and a traction unit, wherein the clamping unit is used for clamping the test piece, the driving unit is connected with the clamping unit and the two ends of the traction unit are connected with the driving unit and one traction disc respectively. Each driving unit includes a sliding block, a hydraulic cylinder, a piston and a piston rod, wherein the sliding block is slidingly connected with the support plate, the hydraulic cylinder is fixedly arranged on the sliding block and has an inner cavity, the piston is arranged in the hydraulic cylinder, one end of the piston rod is fixedly connected with the piston and the other end of the piston rod is fixedly connected with the clamping unit; the test device further includes a hydraulic pipe, a pipe cavity of the hydraulic pipe is filled with hydraulic oil, each hydraulic cylinder is connected with the hydraulic pipe, and the inner cavity of each hydraulic cylinder is communicated with the pipe cavity of the hydraulic pipe. The device can automatically adjust the uniformity of a force in each drawing direction through the hydraulic pressure, uniform force loading is achieved, and therefore the uneven deformation of the test piece is avoided.

Description

technical field [0001] The invention belongs to the field of dynamic testing and characterization of mechanical properties of materials, is used in industries such as automobiles and aviation, and relates to a bidirectional tensile test device. Background technique [0002] Rubber materials are widely used in the automotive industry, such as tires, engine mounts, door seals, crash test dummies, etc. Obtaining the data of mechanical properties of rubber is of great significance for the study of automobile safety, automobile NVH performance and fuel economy. [0003] Common rubber mechanical tests include unidirectional tension and unidirectional compression. For the unidirectional compression test of rubber, there is an inevitable error factor: when the sample is compressed, it cannot expand uniformly in the circumferential direction. Under the action of friction on the compression interface, the closer the sample is to the compression surface, the greater the expansion Con...

AI Technical Summary

Problems solved by technology

In the prior art, there is also an equi-biaxial tensile test device, but the existing equipment cannot guarantee the uniformity of each tensile direction of the sample due to the controlled displacement loading.

Moreover, the existing equipment pulls the sample through a flexible steel wire rope and a pulley, the device is too complicated and the operation is inconvenient

In addition, the existing equipment needs to be loaded by the electronic universal testing machine. The size of the equipment is limited by the space of the testing machine, which also limits the maximum deformation of the tested sample.

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