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Displacement measuring device and tester suitable for material tensile test

A technology of tensile test and displacement measurement, which is applied in the direction of measuring devices, analyzing materials, and using stable tension/pressure to test the strength of materials, etc. It can solve the problems that the full stress-strain curve cannot be completely measured, and achieves a wide range of applications. , good accuracy guarantee, and the effect of simplifying the test operation steps

Pending Publication Date: 2018-09-21
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a displacement measuring device in a tensile test different from the above prior art thinking, the device does not use an extensometer, liberates the labor force, and can also solve the problem that the traditional measurement method using the extensometer cannot completely measure the The defect of the full stress-strain curve ensures the accuracy of the measurement results, meets the requirements of engineering and scientific research, and is also conducive to the realization of measurement automation

Method used

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  • Displacement measuring device and tester suitable for material tensile test
  • Displacement measuring device and tester suitable for material tensile test
  • Displacement measuring device and tester suitable for material tensile test

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Embodiment 1

[0041] The present embodiment provides a kind of displacement measuring device suitable for material tensile test, and described device is as figure 1 As shown, it includes: two fixed platforms 1 up and down, a guide rod 2, a linear displacement sensor 3, a casing 4, a fine-tuning screw 5 and a fastening screw 6. Both the upper and lower fixed platforms 1 are integral structures, and are respectively provided with holes for installing test pieces. The guide rod 2 is symmetrically connected to the upper fixed platform, and the sleeve 4 is symmetrically connected to the lower fixed platform. The guide rod 2 can be set in the sleeve 4, and the two are in the vertical direction (the stretching direction in this embodiment) ) for low-friction sliding. The linear displacement sensor 3 is vertically fixedly connected to the guide rod 2, and is connected to the analysis equipment signal through a wire.

[0042] In this embodiment, the guide rod 2 is cylindrical, and the casing 4 is ...

Embodiment 2

[0051] This embodiment provides a displacement measurement device suitable for material tensile tests. The difference from Embodiment 1 is that three guide rods 2 are symmetrically arranged on the upper fixed platform, and correspondingly, three guide rods 2 are symmetrically arranged on the lower fixed platform. Casing 4. Correspondingly, each guide rod 2 is fixedly connected to the linear displacement sensor 3, therefore, the data of the three linear displacement sensors 3 are finally averaged, and the obtained result is more accurate.

Embodiment 3

[0053] This embodiment provides a displacement measurement device suitable for material tensile tests. The difference from Embodiment 1 is that four guide rods 2 are symmetrically arranged on the upper fixed platform, and correspondingly, on the lower fixed platform, Four bushings 4 are arranged symmetrically. Correspondingly, each guide rod 2 is fixedly connected to the linear displacement sensor 3 . Therefore, the data of the four linear displacement sensors 3 are finally averaged, and the obtained result is more accurate.

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Abstract

The invention provides a displacement measuring device suitable for a material tensile test. The device comprises upper and lower fixed stations, and further comprises linear displacement sensors of which number is two or above, wherein the linear displacement sensors detect generated displacement during stretching and analyze equipment signal connection. The invention further provides a tester suitable for the material tensile test. The tester adopts the displacement measuring device. The displacement measuring device and tester suitable for the material tensile test have the advantages thatthe requirements of the displacement measurement of the whole process of the material tensile test can be well satisfied, a material stress-strain whole process curve can be accurately obtained; an extensometer is not adopted, the problems that the extensometer needs to be loosened in advance in an extensometer measurement method and the stress-strain whole process curve cannot be measured are solved, the extensometer is prevented from being damaged when a sample breaks; the operation steps of the material tensile test are simplified; the use range is wide, and the device is not limited by thesize of materials or breakage elongation, and can be applied to the displacement measurement in large-size materials and tensile tests with large breakage elongation.

Description

technical field [0001] The invention belongs to the field of material stress-strain testing, and in particular relates to a displacement measuring device and a testing machine suitable for a material tensile test. The full stress-strain curve can be obtained by using the displacement measuring device and the testing machine. Background technique [0002] Tensile test is one of the most basic tests in the field of material mechanics. By measuring the mechanical properties of the test piece under the action of axial tensile load, some basic mechanical performance parameters of the material, such as elastic modulus and elongation, can be obtained. , yield strength and tensile strength, etc. These performance indicators are very important for the selection, design and development of new materials and new products. In addition, tensile tests are also essential for material acceptance and product safety performance evaluation. [0003] In the measurement data of the tensile test,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01B21/02
CPCG01B21/02G01N3/08G01N2203/0682G01N2203/0075G01N2203/0017G01N2203/0003
Inventor 祝文君强伟乐井国庆黄刚
Owner BEIJING JIAOTONG UNIV
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