Horizontal biaxial extension testing machine and tension testing method thereof

Abstract

The invention discloses a horizontal biaxial tension testing machine and a tension testing method thereof. The machine comprises a main body structure (1), the main body structure is a machined large-caliber thick-walled steel tube, the peripheral surface of the main body structure is horizontally uniformly provided with hollow jacks (3), and every hollow jack is fixedly connected with the main body structure through a flange plate (2). Every hollow jack is sequentially connected with a pressure sensor (4), a hexagonal lock cap (5), a pull rod (6) and a combination jig to form a transmission system. The surfaces, connected with the flange plates, of the main body structure are processed planes. The combination jigs are connected to the pull rods and can linearly move with the pull rods. The combination jigs are used to clamp samples. The invention also provides a method for carrying out biaxial tension testing by using the horizontal biaxial tension testing machine. The horizontal biaxial tension testing machine has the advantages of compact structure, simple form, convenience in adjustment, stability in working, achieving of simultaneous and centrically centrosymmetric loading, and various test functions.

Description

technical field [0001] The invention relates to a horizontal biaxial tensile testing machine technology, which belongs to the technical field of engineering materials, physical properties, structural deformation and mechanical experiment technology. Mechanical properties of fatigue loads. Background technique [0002] The traditional uniaxial tensile testing test method cannot faithfully reflect the stress of the material in the actual project, so it is particularly important to carry out the mechanical test experiment of the material under the biaxial stress state. At present, there are many kinds of biaxial testing machines at home and abroad, which can be divided into hydraulic drive and motor drive according to the drive type, and the two methods have their own advantages and disadvantages. [0003] Fang Daining, Li Yueguang, Bao Pei, etc. "Vertical Two-axis Four-Cylinder Electro-hydraulic Servo Testing Machine" (ZL.200610012089.9) developed a vertical two-axis four-cyl...

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Problems solved by technology

[0003] Fang Daining, Li Yueguang, Bao Pei et al. developed a vertical two-axis four-cylinder electro-hydraulic servo testing machine (ZL.200610012089.9), which uses electro-hydraulic servo. The system structure is huge and too complicated, which is not conducive to production and assembly, and the size of the sample clamped is limited

[0004] Chen Wujun, Shi Guanglin, and Zhang Li’s “Electro-hydraulic Loading System for Film Biaxial Tensile Testing Machine” (ZL.20111107672.9) developed an electro-hydraulic control system for film biaxial tensile testing machine, using two sets of valves to control two axes, however The synchronization and dynamic response characteristics of the system are not very good

[0005] "A Biaxial Tensile Test Device" (ZL.20151005909.0) by Chen Wujun, Gao Chengjun and Shi Guanglin developed a biaxial tensile test device for steel structure welding, which is driven by a servo cylinder and driven by a horizontal platform and a linear guide rail. , but the overall structure is complex, and it is difficult to ensure the accuracy of welding assembly

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