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NiTi memory alloy bolt connector self-relaxation test device and method

A memory alloy and testing device technology, applied in measuring devices, using repetitive force/pulsation force to test material strength, instruments, etc. The effect of precision

Pending Publication Date: 2018-08-10
GUILIN UNIV OF AEROSPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, since the self-relaxation of the bolt pre-tightening force is very small, one of the existing technologies is to use force-measuring gaskets to test the bolt pre-tightening force, which cannot accurately measure the self-relaxation; the other is to paste the strain gauge on the bolt On the rod, since the elastic modulus of the bolt rod changes due to the accumulation of martensite during the self-relaxation process of the shape memory alloy bolt, it is difficult to reflect the change of the pre-tightening force through strain measurement

Method used

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  • NiTi memory alloy bolt connector self-relaxation test device and method
  • NiTi memory alloy bolt connector self-relaxation test device and method
  • NiTi memory alloy bolt connector self-relaxation test device and method

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Embodiment

[0019] Such as figure 1 As shown, the NiTi memory alloy bolt joint self-relaxation test device provided by the embodiment of the present invention is composed of a data collector 1, a strain data collector 2, an electronic stretching device 3, a strain data lead-out line 4 and a cyclic stretching tooling 5 , the data collector 1 is connected to the strain data collector 2 through the data line, the strain data collector 2 is connected to the cyclic stretching tool 5 through the strain data lead-out line 4, and the cyclic stretching tooling 5 is installed on the electronic stretching device 3.

[0020] Such as figure 2 As shown, the cyclic stretch tooling 5 consists of a stretch rod 5-1, a stretch sleeve 5-2, a nut 5-3, a bolt 5-4, a test gasket 5-5, a connected part 5-6, and a strain gauge The wire 5-7 and the strain gauge 5-8 are composed, the tension rod 5-1 is connected with the tension sleeve 5-2 through threads, and the bolt 5-4 is tightened on the two connected parts 5...

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Abstract

The invention discloses a NiTi memory alloy bolt connector self-relaxation test device and method. The device is connected with a strain data acquisition instrument by utilizing a data acquisition unit; the strain data acquisition instrument is connected with a cyclic stretching tooling through a strain data leading-out line; the cyclic stretching tooling is mounted on electronic stretching equipment. The method is that a stretching rod is connected with a stretching sleeve through threads, a bolt is tightened on two connected parts through nuts, a strain gauge conductor is led out from holesin the connected parts, the stretching sleeve is connected with the connected parts through threads, and a strain gauge is bonded to a test gasket. The NiTi memory alloy bolt connector self-relaxationtest device and method disclosed by the invention have the beneficial effects that the cyclic tensile loading test of bolt connection is performed by utilizing a bolt axial cyclic tensile test device, the self-relaxation quantity of the bolt can be accurately measured, and a new way and a scheme are provided for accurate measurement on bolt self-relaxation.

Description

technical field [0001] The invention relates to the technical field of bolt strain testing, in particular to a self-relaxation testing device and method for NiTi memory alloy bolt joints. Background technique [0002] At present, since the self-relaxation of the bolt pre-tightening force is very small, one of the existing technologies is to use force-measuring gaskets to test the bolt pre-tightening force, which cannot accurately measure the self-relaxation; the other is to paste the strain gauge on the bolt On the rod, since the elastic modulus of the shape memory alloy bolt will change due to the accumulation of martensite during the self-relaxation process, it is difficult to reflect the change of the pre-tightening force through strain measurement. Contents of the invention [0003] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a NiTi memory alloy bolt joint self-relaxation test device and method. [0004] The technical so...

Claims

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Application Information

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IPC IPC(8): G01N3/36G01N3/02
CPCG01N3/02G01N3/36G01N2203/0005G01N2203/0017G01N2203/0048
Inventor 邹爱成蒋翔俊王群英刘忠
Owner GUILIN UNIV OF AEROSPACE TECH
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