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Measurement method for influence of residual stress on relaxation of tangential dual-bolt connection structures

A technology of residual stress and connection structure, which is used to measure torque/torsional force and other directions during tightening, can solve the problems of low measurement accuracy and complicated operation, and achieve the effect of accurate data, simple operation and guaranteed accuracy

Active Publication Date: 2018-01-12
BEIJING UNIV OF TECH
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Problems solved by technology

[0006] The present invention solves the problems of complex operation, low measurement accuracy, ignoring the influence of double-bolt interaction and the inability to quantitatively analyze the relationship between the residual stress and the relaxation of the double-bolt connection structure in the existing method

Method used

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  • Measurement method for influence of residual stress on relaxation of tangential dual-bolt connection structures
  • Measurement method for influence of residual stress on relaxation of tangential dual-bolt connection structures
  • Measurement method for influence of residual stress on relaxation of tangential dual-bolt connection structures

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Embodiment Construction

[0016] Step 1: Divide N bolt fasteners of the same batch and the same material into M groups, with n pieces in each group, numbered Ⅰ, Ⅱ, Ⅲ, ..., and the corresponding tangential connectors are numbered 1 and 2 in sequence , ..., and ultrasonically cleaned it before the experiment, and N, M, n are all even numbers.

[0017] Step 2: Apply a certain amplitude of exciting force and continuous vibration of frequency to the M group of bolts fixed on the vibrating table. At the same time interval, remove a group of bolts in sequence until all the bolts are removed.

[0018] Step 3: Leave the experimental bolts of group M after vibration for several days to release the residual stress. Then according to certain principles, select 4 test points on the polished rod of each bolt in each group of experimental bolts, and carry out the residual stress test through the X-ray residual stress tester, and measure the circumferential and axial residual stress of each measuring point , and reco...

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Abstract

The invention discloses a measurement method for the influence of residual stress on relaxation of tangential dual-bolt connection structures, and belongs to the field of mechanical engineering and mechanics. The measurement method includes the steps that the tangential dual-bolt connection structures of different residual-stress bolts are clamped through a tensile testing machine, and specific periods, specific frequencies and specific alternating loads of amplitude values are provided for the tangential dual-bolt connection structures; with cyclic loading, time-variable data of mechanics anddisplacement is obtained, variations of tangential-dual-bolt clamp force under different pieces of residual stress are analyzed and obtained, and a tensile test is repeatedly carried out multiple times; under comprehensive analysis of the mechanics data and the displacement data, the high-accuracy and accurate influence of relative displacement variations between joint surfaces under different pieces of residual stress on the clamp force of the tangential dual-bolt connection structures is finally obtained; attenuation of the residual stress for the clamp force of the tangential dual-bolt connection structures is quantitatively elucidated, and in the tightening and loading process, the interaction effect of the tangential dual-bolt connection structures under different pieces of horizontal residual stress is reflected through pre-tightening-force variations of two bolts and different relaxation curves.

Description

technical field [0001] The invention relates to a method for measuring the effect of residual stress on the relaxation of a tangential double-bolt connection structure, belonging to the field of mechanical engineering and mechanics. Background technique [0002] Bolt relaxation is the process in which the clamping force of a bolt fastener with a certain pretightening force decreases under alternating load conditions, which is called bolt relaxation. There are many factors affecting bolt relaxation, one of which is that the residual stress on the machined surface of the bolt affects the initial pretightening force of the bolt and the attenuation of the clamping force under vibration conditions. [0003] There is residual stress in the processed surface quality of bolts. Residual stress is a force that exists inside the object in a balanced state, and it is also an unstable stress state. When the object is subjected to external force, the acting stress interacts with the resid...

Claims

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Application Information

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IPC IPC(8): G01L5/24
Inventor 蔡力钢张明洋刘志峰李迎吕华峰徐文祥
Owner BEIJING UNIV OF TECH
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