Clamp, device with clamp for testing mechanical property of hyper-elastic material and method

Abstract

The invention relates to a device and a method for testing mechanical property of a hyper-elastic material. The device mainly comprises a reinforcing piece (4) at the end of a test piece and a test piece clamp, wherein the reinforcing piece (4) has a trapezoidal cross section; a clamping port of the clamp is an inclined surface; the reinforcing piece (4) is adhered to the end of the test piece and is arranged in the clamp, the inclined surface of the clamp tightly clamps the inclined surface of the reinforcing piece (4), and the clamp is self-locked in the tensioning process and is prevented from locally deforming. The device is applied to multiple stress-strain tests of the hyper-elastic material such as uniaxial tension, equally biaxial tension and planar tension (pure shear). Stress data is acquired by a data acquisition system of an electronic universal testing machine, and the strain data is acquired by a charge coupled device (CCD) image acquisition device. Due to the technical scheme, the clamping force is high when the tension is high in the process of tensioning the test piece, so that the test piece is uniformly stressed, more accurate testing data can be obtained, and the mechanical property parameters of the hyper-elastic material obtained accordingly are more reliable.

Description

technical field [0001] 1. The present invention relates to a fixture of a superelastic material, especially a mechanical property testing device for rubber, a superelastic material mechanical property testing device with a fixture, and a testing method. Background technique [0002] 2. Hyperelastic materials are mostly used in the field of vibration and noise reduction. At present, the finite element method has become an important means for the design and development of such products. The accuracy of hyperelastic material parameters plays a decisive role in predicting the static properties of products by finite element method. In order to accurately characterize the properties of hyperelastic materials, basic experiments such as uniaxial tension, equibiaxial tension and planar tension must be carried out on hyperelastic materials. [0003] 3. At present, for the testing of complex stress states of hyperelastic materials, the fixtures and specimens used are fastened by bolts...

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Problems solved by technology

[0004] 4. When the specimen is stretched, only a small area in the center of the specimen is stretched uniformly, and other areas are stretched unevenly. However, the previous test collected a large range of strain data, and the accuracy of the test results obtained was not high.

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