Biaxial extension test device

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...

AI Technical Summary

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

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