A biaxial tensile testing device
A biaxial stretching and testing device technology, which is applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of large friction force of the walking mechanism, large initial pre-tensioning force, and laborious operation, so as to ensure the overall The effect of strength, compact structure and simple form
Active Publication Date: 2019-02-19
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
However, the cross-shaped frame of the tensile test device is complex, large in size, and inconvenient to assemble. It is difficult to control the force of the specimen clamped by the fixture, and the operation is laborious. The friction force of the traveling mechanism is large, and the initial pretension force is large, which affects the initial test accuracy. The separation of hydraulic servo valve and hydraulic cylinder affects the dynamic response characteristics and control accuracy of hydraulic control
[0006] 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, and then Loading at both ends of a shaft is achieved through shut-off valves and regulating valves, but the synchronization and dynamic response characteristics of the system are not very good
Method used
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[0039] like Figure 1~3 As shown, a preferred embodiment of the present invention provides a biaxial tensile testing device, the structure of which includes a horizontal platform frame 14, a servo cylinder 1, a tension sensor 4, a combination fixture, and a linear guide rail 10. Wherein, the combination fixture includes a fixture bracket 7 and a fixture 8 . The horizontal platform frame 14 is an orthogonal cross, and the ends of the four arms of the horizontal platform frame are all equipped with servo cylinders 1, and the servo cylinders 1 are connected to the horizontal platform frame 14 by bolts. Each servo cylinder 1 is connected to the tension sensor 4, clamp bracket 7, and clamp 8 in turn. Specifically, the piston of the servo cylinder 1 is connected to the tension sensor 4 through the first conversion part 3, and the tension sensor 4 is connected to the second conversion part. 5 is connected to the third transition piece 6, the third transition piece 6 is connected to ...
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Abstract
The invention discloses a biaxial extension test device. The biaxial extension test device comprises a horizontal rack which is an orthogonal cross, wherein a servo-cylinder is mounted at the end part of each of four arms of the horizontal rack and sequentially connected with a tension sensor and a combined fixture; a linear guide rail is arranged on the surface of each of the four arms of the horizontal rack; and the combined clamps are arranged on the linear guide rails, can move along the linear guide rails and are used for clamping test pieces. The invention also provides a method for the biaxial extension test device to perform biaxial extension test, and the method comprises a plurality of steps. The biaxial extension test device is compact in structure, concise in format, stable in operation and high in precision, has various test functions (unidirectional static extension, low-cycle reciprocating extension, bidirectional static tensile strength and optional biaxial stress ratio low-cycle reciprocating extension), and can be applied to uniaxial tensile test machines, biaxial tensile test machines and the like.
Description
technical field [0001] The invention relates to a tensile testing device, in particular to a biaxial tensile testing device, which can be applied to biaxial monotonous stretching and low cycle cycle, tearing, and creep of architectural membranes, airship skins, and industrial fabrics test etc. It belongs to the field of material mechanics experiment technology and building structure material test technology. Background technique [0002] Polymer composite fabric film materials are lightweight, high-strength, chemical-resistant, and durable, and are used in modern architectural structures, aviation, aerospace and other industrial fields, such as architectural membrane structures, aviation airships, aerospace parachutes or soft landing systems. The fabric film is generally composed of a base cloth and a coating. The base cloth is made of polymer materials and synthetic fibers, and then woven into cloth. In the field of construction, there are mainly polyester fibers, glass fi...
Claims
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IPC IPC(8): G01N3/10
Inventor 陈务军高成军施光林
Owner SHANGHAI JIAOTONG UNIV