Stretching-shearing and stretching-torsion coupling effect measuring device and method

A measurement device and coupling effect technology, applied in the field of mechanical performance research, can solve the problems of unsatisfactory test verification, the direction of tension cannot be kept unchanged, and the loading method limits the lateral deformation of the test piece, so as to improve the measurement accuracy and high measurement accuracy , the effect of reducing the error

Active Publication Date: 2020-06-12
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the verification methods for the tensile-shear and tensile-torsion coupling effects of composite materials are limited to theoretical derivation and numerical simulation, while the electronic universal tensile testing machine used in general tensile tests is completely limited in its loading methods. The lateral deformation of the test piece is limited, so it cannot meet the requirements of the relevant coupling effect test verification, resulting in no experimental method to accurately measure the coupling effect of the composite material structure.
[0004] The main defects of the test measurement of tension-shear and tension-torsion coupling effects in the prior art are: (1) the test piece to be tested cannot be freely deformed perpendicular to the loading direction, and it is difficult to ensure the shear deformation of the test piece structure Or torsional deformation is not limited; (2) The direction of the tensile force cannot be kept unchanged after the deformation of the test piece to be tested, and it is difficult to ensure that the loading of the test piece structure is not affected by the deformation

Method used

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  • Stretching-shearing and stretching-torsion coupling effect measuring device and method
  • Stretching-shearing and stretching-torsion coupling effect measuring device and method
  • Stretching-shearing and stretching-torsion coupling effect measuring device and method

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Embodiment 1

[0051] A composite tensile-shear and tensile-torsion coupling effect measurement device, the overall structure of which is as follows figure 1 As shown, it includes a test frame 1, a loading device 4, and a deformation measurement device 5; functionally, the measurement device is composed of a loading device and a deformation measurement device, wherein the loading device mainly includes: a test frame 1, a loading device 4, and The connecting device 2 connecting the test frame 1, the test piece to be tested and the loading device 4, further from the perspective of the connection relationship, the connecting device 2 includes upper and lower parts, the upper part is connected to the test frame 1 and the test piece to be tested, and the lower part is connected to the test piece to be tested. Test piece and loading device 4; the loading device 4 includes a connecting rod and a weight tray; the connecting rod is fixedly connected with the lower end portion of the connecting device,...

Embodiment 2

[0068] The details of using the device of the present invention to measure the tensile-shear coupling effect of the composite plate include the following:

[0069] First, complete the installation and fixation of the test piece to be tested, and complete the connection and debugging of the CCD camera and the data acquisition device;

[0070] Secondly, the calibration of the test area of ​​the test piece to be tested is completed. The specific method is as follows: spray the test area of ​​the composite laminate test piece with white dot-shaped markers, so that the area is full of white dots to measure the displacement information. The position information of each measurement point and the speckle image formed at this time are used as the static characteristic index of the test piece; then, turn on the CCD camera and the data acquisition device in the deformation measurement device 5, and adjust the position of the CCD camera so that the test piece is to be measured. The speckl...

Embodiment 3

[0075] A method for measuring the tensile-torsional coupling effect of composite materials, the overall structure of which is as follows figure 2 As shown, the deformation measuring device further includes a target 54, the target 54 is composed of a straight rod and a rectangular target paper, and the straight rod is fixedly connected with the target paper for measuring the tensile-torsion coupling effect.

[0076] The specific steps include the following:

[0077] First, complete the installation and fixation of the test piece to be tested, and complete the connection and debugging of the CCD camera and the data acquisition device;

[0078] Secondly, complete the installation of the target and data collection, the specific methods are as follows:

[0079] Adjust the target to a suitable position and fix it with the upper end face of the test piece and the lower end fixture. The fixing method can be adhesive or magnetic; then open the data analysis and processing software, d...

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Abstract

The invention belongs to the technical field of mechanical property research, and provides a stretching-shearing and stretching-torsion coupling effect measuring device and method. The device comprises a test rack (1), a connecting device (2), a loading device (4) and a deformation measuring device (5), the connecting device comprises an upper end clamp (21) and a lower end clamp (22), and a connecting disc (12) connected with the test rack body and the upper end clamp (21) is arranged on the test rack (1). The upper end clamp (21) connects one end of a to-be-tested test piece to the test rackbody, and the lower end clamp (22) is connected with the other end of the to-be-tested test piece and the loading device. The device has the advantages of being simple in structure, being easy to manufacture and convenient to operate, and being capable of achieving the high-precision measurement of a stretching-shearing and stretching-torsion coupling effect of a composite material structure.

Description

technical field [0001] The present invention generally relates to the technical field of mechanical property research, and in particular relates to a tensile-shear and tensile-torsional coupling effect measuring device and method. Background technique [0002] Composite materials have the advantages of high specific strength, high specific stiffness, designable performance, and easy integral forming. They are more and more widely used in structures such as aircraft, launch vehicles, spacecraft and satellites. The tensile-shear and tensile-torsional coupling effects of composite materials can be used to design a variety of adaptive structures with different coupling effects, such as bending-torsional coupling adaptive structures, tensile-torsional coupling adaptive structures, and so on. These adaptive coupling structures have broad application prospects in structures such as tilt-rotor blades, fixed-wing aircraft wings, and wind turbine blades, and can significantly improve ...

Claims

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Application Information

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IPC IPC(8): G01N3/14G01N3/22G01N3/24
CPCG01N3/14G01N3/22G01N3/24G01N2203/0003G01N2203/0017G01N2203/0021G01N2203/0025G01N2203/0033G01N2203/0075G01N2203/04G01N2203/0647G01N2203/0682
Inventor 李道奎李谨崔达周仕明
Owner NAT UNIV OF DEFENSE TECH
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