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Strength testing fixture using uniaxial testing machine for variable-proportion biaxial loading

A uniaxial test and fixture technology, applied in the direction of strength characteristics, measuring devices, instruments, etc., can solve the problems of lack of equipment and high test costs, and achieve the effect of saving costs and simplifying the test device.

Inactive Publication Date: 2016-08-10
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering that the uniaxial test of metal materials has been developed very maturely at present, and the use of uniaxial testing machines has become very common, for this reason, this paper has invented a strength test jig with variable ratio biaxial loading, which can be used in single The variable-ratio biaxial tensile strength test is carried out on the axial testing machine, which solves the problem of lack of special equipment for biaxial strength test and high test cost, and provides technical support for the determination of material properties and structural strength

Method used

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  • Strength testing fixture using uniaxial testing machine for variable-proportion biaxial loading
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  • Strength testing fixture using uniaxial testing machine for variable-proportion biaxial loading

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Embodiment Construction

[0044] combine figure 1 with figure 2 Describe the specific use and realization principle of the present invention.

[0045] according to figure 1 with figure 2 Install the fixture and clamp the four ends of the test piece so that the test piece is in the center of the base, and the upper and lower chucks (1 and 17) are respectively connected to the uniaxial testing machine, and according to figure 1 Adjust the elastic nut 6 so that the primary lever and the secondary lever are balanced and in a horizontal position, and the steel wire rope 8 is in a tight state. Start the uniaxial testing machine and load it slowly. At this time, assume that the upward pulling force of the upper chuck on the testing machine is F, then it can be known from the principle of lever balance that the pulling force exerted by the primary connecting rod 3 on the fulcrums of the two secondary lever beams is equal. It is F / 2, and the force analysis of the secondary lever shows that the magnitude o...

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Abstract

The invention provides a biaxial tensile strength testing fixture. With the fixture, variable-proportion biaxial tensile strength testing of a cross sample can be carried out with a uniaxial testing machine. The fixture is characterized by comprising an upper chuck, a primary lever crossbeam, a primary connecting rod, a secondary lever crossbeam, a secondary connecting rod, a loosening and tightening nut, a wire rope connector, a wire rope, a grooved flywheel, a bearing pedestal, a bearing, cross guide rails, a clamp with a slide block, a test piece, a base and a lower chuck. With the fixture, biaxial tensile strength testing of various load proportions can be implemented with the uniaxial testing machine. The fixture distributes pulling force at four directions in virtue of the lever balance theory, and pulling force at two axial directions of the test piece can be solved through static equilibrium, so usage of force sensors is avoided; moreover, the uniaxial testing machine is made full use of, the problems of lack of special biaxial strength testing equipment and high testing cost are overcome, and technical support is provided for determination of material performance and structural strength.

Description

technical field [0001] The invention designs a biaxial tensile strength test jig, which realizes the biaxial tensile strength test of various loading ratios on a cross plate sample by using a uniaxial testing machine, and belongs to the technical field of test and test. Background technique [0002] In recent years, with the rapid development of material technology, because of its excellent performance (high specific strength, high specific stiffness, excellent fatigue performance and good designability, etc.), planar braided composite materials are more and more used in Replace traditional metal structures in engineering structures, especially in the field of aerospace, such as helicopter composite blades, aircraft skins, engine bearings, etc. However, unlike isotropic traditional metal materials, planar braided composite materials are generally anisotropic, and their strength and elastic properties cannot be determined by simple unidirectional tests like metal materials. S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/04
CPCG01N3/04G01N2203/0423
Inventor 熊峻江王强李钰吕志阳
Owner BEIHANG UNIV
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