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Experimental device and experimental method for measuring ultimate contact stress of connected part in bolt joint

A technology of bolt joints and contact stress, applied in measuring devices, using stable tension/pressure to test material strength, instruments, etc., can solve problems such as contact surface depressions, plastic deformation of materials, etc., and achieve simple processing, accurate force measurement, Simple effects in preparation

Active Publication Date: 2019-01-29
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] The problem addressed by the present invention is the ultimate contact stress of materials in bolted joints: in bolted joints, due to changes in external factors or initial loading, the pretightening force exceeds the yield limit of the material, the material undergoes plastic deformation, and depressions occur on the contact surface

Method used

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  • Experimental device and experimental method for measuring ultimate contact stress of connected part in bolt joint
  • Experimental device and experimental method for measuring ultimate contact stress of connected part in bolt joint
  • Experimental device and experimental method for measuring ultimate contact stress of connected part in bolt joint

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Embodiment Construction

[0044] Combine below Figure 1-8 And experimental method, the present invention is described in more detail.

[0045] Experimental device for measuring short-term relaxation effects in bolted joints provided according to the invention, such as figure 1 , figure 2 As shown, it includes a stretching machine 3, a clamp 7, a dial indicator 8, a magnetic base 9, a test piece 10, a sensor 11, and a polished rod bolt 12. The material types and shapes and sizes of the test pieces 10 used in the experiment are the same.

[0046] Design of non-purchased parts: Fixture 7 must ensure the strength requirements, and heat treatment after processing is completed to enhance rigidity. The design size of the fixture 7 is that the thickness of the upper and lower end faces is 20mm, the upper chuck 13 of the fixture has a diameter of 40mm and a width of 40mm, the outer diameter is 240mm and the height is 260mm, and the diameter of the bottom hole 15 of the fixture is 40mm. Dial indicator 8, t...

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Abstract

The invention relates to an experimental device and an experimental method for measuring ultimate contact stress of a connected part in a bolt joint and belongs to the field of short-term looseness testing of bolts. The experimental device comprises a stretching machine for loading force and a fixture for internally placing a dial gauge, a magnetic base, a test piece, a pressure sensor, and a polished rod bolt; and the stretching machine accurately measures the change of force and shift in the experimental process in cooperation with the pressure sensor and the dial gauge. The bolt loading manner is divided into two manners of continuous loading and discontinuous loading through the experimental method; in the bolt loading process, the bolt shift is measured through the dial gauge, the pressure borne by the material is measured through the pressure sensor; a stress-strain curve of a test piece is obtained through calculation; and ultimate contact stress of the material is obtained through curve analysis. The experimental device and the experimental method for measuring ultimate contact stress of a connected part in a bolt joint in the invention have the characteristics of simple structure, convenience for use, convenience for experimental data processing, high measuring precision and wide application range.

Description

technical field [0001] The invention belongs to the field of bolt short-term relaxation testing, and relates to an experimental device and an experimental method for measuring the limit contact stress of a connected part in a bolt node, which are used for measuring the limit contact stress of materials under the condition of bolt connection. Background technique [0002] Bolt connection has the characteristics of convenient disassembly, standardized manufacturing and large bearing capacity, and is widely used in connection assembly. In the fields of automobiles, ships, and airplanes, the stability of bolted connections is a key issue, and the bolt preload is an important parameter of connection quality. It is hoped that the preload of bolted connections should be controlled at the most reasonable size to improve the overall assembly quality. Improve the service life, but the bolted joint is a complicated problem, and it is difficult to control the pre-tightening force of the...

Claims

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Application Information

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IPC IPC(8): G01N3/02G01N3/08
CPCG01N3/02G01N3/08
Inventor 张伟孙亚东侯博文孙皓白晓煜马跃孙伟
Owner DALIAN UNIV OF TECH
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