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Clamping force test device and test method for tensile test of composite materials after clamping section slips

A composite material, testing device technology, applied in the direction of measuring device, testing material strength using applied stable tension/pressure, analyzing material, etc.

Inactive Publication Date: 2021-08-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0010] Purpose of the invention: The present invention provides a test device and method for testing the clamping force of the composite material tensile test after the clamping section slips, and solves the problem of setting the clamping force of the tensile test after the clamping section of the composite material specimen with the guard plate slips question

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  • Clamping force test device and test method for tensile test of composite materials after clamping section slips
  • Clamping force test device and test method for tensile test of composite materials after clamping section slips
  • Clamping force test device and test method for tensile test of composite materials after clamping section slips

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Embodiment Construction

[0047] Please combine Figure 1 to Figure 7As shown, the present invention discloses a composite material tensile test clamping force testing device after the clamping section slips, including guard plates 4 pasted on both sides of the clamping section of the composite material specimen 3, and a material tensile testing machine (in the figure Only the fixture is shown), the indentation diameter measuring device, and the calculation module. The material tensile testing machine includes a clamp 1 positioned outside the two side guard plates of the composite material, with embossings 2 on the clamp 1, and the clamp 1 presses the two side guard plates 4 of the composite material specimen 3 from both sides, respectively. Some indentations 5 are made on the outer surface of the guard plate 4 . like Image 6 As shown, the indentations 5 are arranged in multiple rows and multiple columns.

[0048] The indentation diameter measuring device measures the indentation diameter.

[0049...

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Abstract

The invention discloses a test device and method for testing the clamping force of a composite material tensile test after the clamping section slips, by recording the pulling force and clamping force of the testing machine when the clamping section slips, and then cleaning the clamping section of the test piece Place the guard plate under an optical microscope to measure the diameter of the indentation on the clamping surface of the guard plate, draw the change curve of the indentation diameter with the position of the indentation on the axis of the guard plate, and calculate the position of the linear inflection point on the curve on the axis of the guard plate The distance to the end of the guard plate, according to the ratio of the distance to the length of the guard plate, the tensile force and clamping force of the testing machine when the clamping section slips, estimate the clamping force value to be set for subsequent tests. The test device and the test method provided by the invention are simple and easy, do not waste test pieces, do not require engineering experience of operators, and can save test costs.

Description

technical field [0001] The invention relates to the field of testing the mechanical properties of thin plates of composite materials, in particular to a clamping force testing device and a testing method for tensile testing of composite materials. Background technique [0002] Composite materials are widely used in thin-walled structures such as aeroengine fan blades, compressor casings, and turbine casings. In order to understand the mechanical properties of new composite thin-walled structures, it is first necessary to conduct composite material mechanical tests and process batches of composite material thin plate specimens. Batch test pieces for mechanical testing. [0003] In the tensile (static tension and tension fatigue) test, in order to increase the shear resistance of the clamping part and prevent the clamping section of the thin plate from slipping off, the clamping surface of the testing machine and the supporting fixture of the thin plate often have dense and ev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/02G01N3/06
CPCG01N3/02G01N3/068G01N3/08G01N2203/0017G01N2203/0641
Inventor 陈茉莉罗贵火廖学敏
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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