A kind of cross-shaped silica gel biaxial tensile test piece and its preparation and tensile test method

Abstract

The invention relates to a cross-shaped silica gel biaxial tensile test piece and its preparation and tensile test method. The test piece includes a square central area and four extension walls. The four extension walls extend outward around the central area and form a cross shape. The junction of the four extension walls has four edge transition fillets. In the axial direction, there are four circular holes distributed symmetrically along the center circumference of the test piece. The part of the four extension walls near the central area is the connection area, and the end of the extension wall is the clamping area. There are transitional arcs on both sides, and the corners of the specimens are rounded, and the preparation method and tensile test method are provided. The invention can measure the relationship between the nominal stress and the strain of the silica gel material, and then determine its constitutive model parameters, and can be applied to the mechanical test technical field of the silicone rubber hyperelastic material.

Description

technical field [0001] The present invention relates to a kind of specimen that is used for the biaxial tensile test of silicone rubber hyperelastic material, especially to a kind of cross-shaped silica gel biaxial tensile test specimen and its preparation and tensile test method, and its test data can be used to determine The invention relates to constitutive model parameters of silica gel hyperelastic materials, and the invention belongs to the technical field of material mechanics test. Background technique [0002] Compared with ordinary metal materials, silicone rubber hyperelastic materials have more unique mechanical properties. In order to determine their constitutive model parameters, uniaxial tensile tests, biaxial tensile tests, plane shear tests, circular membranes, etc. can be used. Shaft inflation test. For the test of silicone rubber hyperelastic materials, there have been extensive studies on uniaxial tension, plane shear, and circular membrane equiaxial inf...

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Problems solved by technology

[0006] "Viscoelastic material constitutive test device and its test method" (201010172625.8) invented by Wu Hengliang et al. developed a method suitable for uniaxial stretching, plane stretching (pure shear), and equibiaxial stretching for viscoelastic materials. The test device and test method, the structure of the test device is relatively complicated, and the equibiaxial tensile test piece used is a four-axis circular test piece. The test operation for this kind of test piece is more complicated, and no corresponding Test Data

[0007] Zhao Yongling and Hou Zhichao invented "Jigs, Devices and Methods for Measuring the Mechanical Properties of Hyperelastic Materials with Fixtures" (201210247750.X), and developed a method suitable for uniaxial tension and plane tension (pure shear) for hyperelastic materials. . The test device and test method of the biaxial tensile test. The biaxial tensile test piece used is a traditional cross-shaped test piece, but the corresponding test data is not given, and the tensile test during the biaxial tensile test Extensive symmetry cannot be effectively guaranteed

[0008] Hu Yaosheng, Yin Haishan and Wei Yintao invented the "Mechanical Properties Test Method and Special Equipment for Tire Rubber in Complex Stress State" (200810162668.0) and developed a set of uniaxial tension and plane tension (pure shear) for tire rubber. Cut), the experimental system and test method of the biaxial tensile test, but the biaxial tensile test piece is a traditional cross-shaped specimen, which cannot be used to accurately measure the nominal stress-strain data of the material, and the obtained biaxial tensile test The maximum strain is only 0.3, there is a problem of low strain level

[0009] To sum up, most of the specimens currently used for biaxial tensile tests of silicone rubber hyperelastic materials are traditional cross-shaped specimens. The accuracy of test data obtained based on such specimens is not high enough, and there are low strain levels problem, and some optimized cross-shaped specimens also face the problem of low strain level; for the test device disclosed above, the problem of tensile asymmetry in the biaxial tensile test process still exists, and its test method There is a lack of a complete overall process from specimen preparation to test operation to test data processing.

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