Device and method for measuring volume compressibility of polymer hyperelastic material
A volumetric compression, superelasticity technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of inconsistent volumetric stress of the test piece, inaccurate measurement of the volume change of the test piece, and reducing the accuracy of the measurement results. , to achieve uniform volume stress, eliminate measurement errors and improve accuracy
Active Publication Date: 2020-11-13
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
However, there are many disadvantages in this method: there may be a very small gap between the test piece and the metal cylinder, resulting in inaccurate measurement of the volume change of the test piece; there is friction between the test piece and the inner wall of the metal cylinder, which causes the test piece to be affected at various positions. Bulk stresses are not consistent, these will reduce the accuracy of the measurement results
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[0040] Such as figure 1 and figure 2 Shown, a kind of device for measuring the volume compressibility of macromolecule hyperelastic material, is the design of left and right symmetry, comprises support, and outer cylinder 16 (such as image 3 As shown), the left and right ends of the outer cylinder 16 are sequentially connected with the cylinder liner 6 and the end cover 3. In this embodiment, the left end of the outer cylinder 16 is used to place the test piece 14, i.e. the experimental group, and the right end of the outer cylinder 16 is used for Place the metal test piece 18, i.e. the control group, and its purpose is to eliminate the measurement error: although the bulk modulus of the liquid is much greater than that of the test piece, when the liquid is pressurized, the volume will change slightly; the end cap 3 When subjected to a large hydraulic pressure, the volume of the internal cavity will also change, which will affect the measurement of the volume change of the ...
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Abstract
The invention relates to a device and a method for measuring the volume compressibility of a polymer hyperelastic material. The device comprises a bracket, a cylindrical outer barrel is mounted on thebracket; a test part and a contrast part are symmetrically mounted at the two ends of the outer cylinder respectively; each of the testing part and the contrast part comprises an end cover and a cylinder sleeve which are connected in sequence; the cylinder sleeve is connected with the outer barrel; a piston capable of moving left and right is arranged in the cylinder sleeve; the cylinder sleeve is filled with lubricating oil; a flow sensor is installed on the cylinder sleeve, the end cover is filled with purified water, a to-be-tested piece is placed in the end cover of the testing part, a metal test piece is placed in the end cover of the contrast part, a heating wire is installed in the outer cylinder, the heating wire is connected with an external power source, the outer cylinder is filled with hydraulic oil, and a pressure sensor is installed on the outer cylinder. Compared with the prior art, the liquid is heated to expand, the volume stress is applied to the test piece, and thevolume variation of the test piece is indirectly measured by measuring the flow of the liquid, so that the accuracy of a measurement result can be effectively improved.
Description
technical field [0001] The invention relates to the technical field of polymer superelastic material testing, in particular to a device and method for measuring volume compressibility of polymer superelastic materials. Background technique [0002] Polymer superelastic materials such as rubber and polyurethane have the characteristics of strong elasticity, large deformation, and low conductivity. They are widely used in various aspects of industry and life, such as automobile tires, pipe seals, and vibration isolation and vibration reduction of precision instruments. Volume compressibility is an important mechanical index of hyperelastic materials, which is generally described by bulk modulus, which refers to the ratio of volume stress to volume strain experienced by an object, namely: [0003] [0004] Among them, P is the volume stress on the object, ΔV is the volume change of the object, and V 0 is the original volume of the object. [0005] For the measurement of th...
Claims
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IPC IPC(8): G01N3/12
CPCG01N3/12
Inventor 张南南刘国政丁雪丁嘉鑫孙立民
Owner SHANGHAI JIAO TONG UNIV