High elastomer material equiaxial tensile testing machine

Abstract

The invention discloses a high elastomer material equiaxial tensile testing machine. The high elastomer material equiaxial tensile testing machine comprises a rack and a tensile mechanism arranged onthe rack, wherein the tensile mechanism comprises a circular platform, a rotary table, a circular fixture, a pulling rope and a pulley mechanism, the circular platform and the rotary table are coaxially and sequentially arranged on the rack, the rotary table is driven by a driving mechanism arranged in the rack, the circular fixture is arranged on the circular platform, one end of the pulling ropeis connected with the circular fixture, and the other end of the pulling rope is connected with the rotary table by virtue of the pulley mechanism. A circular sample is placed on the circular fixture, and the circular fixture clamps the circular sample, the driving mechanism drives the rotary table to rotate, the rotary table pulls the circular fixture by virtue of the pulling rope and the pulleymechanism, and the circular fixture stretches the circular sample, so that the circular sample is uniformly expanded and contracted, and the equiaxial tensile effect is realized. The high elastomer material equiaxial tensile testing machine disclosed by the invention enables stress and deformation of the circular sample to be more uniform and is more applicable to carrying out a stress-strain relation test on a high elastomer material, and the strain measurement accuracy is higher.

Description

technical field [0001] The invention relates to the technical field of tensile testing equipment, in particular to an equiaxial tensile testing machine for high elastic body materials. Background technique [0002] Measuring the stress-strain curves of materials under equibiaxial conditions is of great significance for studying the mechanical properties of elastomers. [0003] Equivalent biaxial tensile test equipment should have the same tensile force of the two axes, and can accurately measure material strain. Existing materials such as biaxial tensile test equipment adopt the "cross-type" biaxial tensile method. The specific equipment There are two types, one is for metal materials with large modulus (greater than 1GPa) and small deformation; the other is for thin film materials with small modulus (less than 1MPa). [0004] If the first equipment is used for biaxial tensile testing of high elastic body, there are several disadvantages as follows: [0005] 1. The precisi...

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Problems solved by technology

[0005] 1. The precision of the load sensor of the experimental machine is not enough, and the stress measurement is not accurate

[0006] 2. The requirements for the synchronization and equality of the tension of the two axes are very high. If the tension of the two axes is different, the deformation of the high elastic body material during the stretching process will be uneven, and the condition of equal biaxial deformation will not be satisfied. , and the accuracy of many experimental equipment cannot guarantee the uniform deformation of the high elastic body during the stretching process, or the area of ​​the local deformation uniform area is small, which is not conducive to measuring the strain of the material

[0007] 3. The tensile deformation of the high elastic body material is very large, and the method of measuring small deformation (such as the method of attaching strain gauges, etc.) cannot be used to measure the strain during the tensile test

[0008] 4. High elastic body materials have special physical properties. Unlike metal materials, the stress-strain curve obtained by only one stretch is not enough to describe the complete tensile mechanical properties of high elastic body. The current biaxial tensile test of metal There are no effective experimental methods and data processing methods for high elastic bodies

[0010] 1. The allowable tensile load of the biaxial cross-shaped film tensile testing machine is small, and the stroke range is small, which is not enough to stretch the high elastic body to a large deformation state (generally requires a tensile strain greater than 50%)

[0011] 2. The material is difficult to clamp, and the material is easy to be unclamped or pinched during the stretching process

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