Experimental device for converting uniaxial stretching to biaxial stretching

Abstract

The invention discloses an experimental device for converting uniaxial stretching into biaxial stretching. It is composed of connecting piece, rivet a, rivet b, screw rod and lower stretching frame. The frame is the main structure of the whole device. There are chutes in the two vertical beams of the frame, and the sliding connectors are connected with the upper and lower stretching frames and pull rods in the chutes. When the specimen in the fixture in the vertical direction gets Tensile force, through the upper and lower stretching frame drives the sliding connector to move in the vertical direction, drives the movement of the pull rod, and realizes the clamp movement in the horizontal direction, so that the specimen in the clamp can obtain the second axial force in the horizontal direction. Stretching force, and then achieve biaxial stretching. The biaxial tension test device of the present invention can provide bidirectional tension and displacement, simulate plane stress state, and the horizontal load and vertical load can cancel each other during operation, so that the structure is very safe.

Description

technical field [0001] The traditional tensile test devices for material mechanics are mostly uniaxial tensile test devices. For rubber-like hyperelastic materials, due to the diversity of their constitutive models, their specific constitutive models need to be obtained through a large number of experiments, among which biaxial stretching is an important experiment for rubber-like materials. However, the uniaxial tensile test device can only measure the failure caused by the axial load in a single direction, which obviously cannot meet the requirements of the biaxial test of rubber engineering materials. Therefore, it is of great significance to study the addition of an experimental device on the uniaxial experimental device to realize biaxial stretching. Background technique [0002] Materials are the material basis of today's society and the most important condition in the development process. The rise and fall of materials can drive the development and decline of indust...

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Problems solved by technology

[0004] At present, there are few mature biaxial stretching equipment in the market. The main reason is that to achieve biaxial stretching, servo systems must be built in different positions, which will greatly increase the complexity of the equipment, making the system difficult to meet the requirements, and the equipment cost is also high. greatly increasing

[0005] In view of the limitations of the uniaxial stretching device and the low feasibility of biaxial stretching in the market, an experimental device for converting uniaxial stretching to biaxial stretching is now proposed.

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