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Method for detecting pretightening force of high-strength bolt

A technology of high-strength bolts and detection methods, applied in force/torque/work measuring instruments, measuring torque/torsional force during tightening, measuring devices, etc., can solve problems such as difficulty in use, wave speed error, etc. The effect of stable excitation frequency and stable measurement results

Active Publication Date: 2021-05-04
XIANGTAN UNIV
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Problems solved by technology

Otherwise, small changes in contact conditions and measurement positions will cause major errors in wave velocity, so it is difficult to use in actual engineering

Method used

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  • Method for detecting pretightening force of high-strength bolt
  • Method for detecting pretightening force of high-strength bolt
  • Method for detecting pretightening force of high-strength bolt

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Embodiment Construction

[0031] The present invention will be further specifically described below in conjunction with the accompanying drawings and embodiments.

[0032] See Figure 1~ Figure 8 , the detection method of high-strength bolt preload provided by the invention specifically comprises the following steps:

[0033] (1) Select a model with a bolt diameter of 16mm, according to the actual situation of high-strength bolts in steel structure engineering (such as Figure 1a Shown) Set the elastic modulus (Ε), density (ρ), Poisson's ratio (μ) of the relevant material, and establish high-strength bolts at different preloads in COMSOL Multiphysics (that is, the preload reaches the high-strength bolt 0, 10%, 20%, 30%, 40%, 50%, 60%, 70% of the tensile strength design value) when the finite element model, using material parameters as shown in Table 1:

[0034] Table 1

[0035] Elastic modulus (GPa) Density(kg / m3) Poisson's ratio steel plate 200 7850 0.3 bolt 209 7850 ...

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Abstract

The invention discloses a method for detecting the pretightening force of a high-strength bolt. The method comprises the following steps: performing acoustic characteristic research on a high-strength bolt and a nut, processing a received pulse signal, performing normalization processing on a time domain signal of the pulse signal, then performing power function fitting to obtain the relationship between the pretightening force of the high-strength bolt and fixed-point acoustic time t, and obtaining the pre-tightening force of the high-strength bolt according to the fixed-point sound time t. According to the method for detecting the pre-tightening force of the high-strength bolt, the equipment is light, the detection efficiency is high, and a convenient, accurate and rapid measurement mode is provided for detection of the pre-tightening force of the high-strength bolt.

Description

technical field [0001] The invention relates to the field of acoustic wave detection, in particular to a detection method for the pretightening force of high-strength bolts. Background technique [0002] At present, steel structure buildings have been widely used in civil buildings and plant construction, and steel structures have shown a particularly important posture in the construction field. High-strength bolt connection is a steel structure node connection method developed in the middle of the 20th century. With the improvement of the performance of structural materials and the manufacturing capacity of standard parts, high-strength bolts are more and more used in engineering. The connection quality of high-strength bolted connections is particularly important to the stability of steel structures. When the pre-tightening force is too large, the strength of the high-strength bolts will be damaged; if the pre-tightening force is too small, the joints will be loose. The ...

Claims

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Application Information

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IPC IPC(8): G01L5/24
CPCG01L5/246
Inventor 龙士国许文宗赵朴凡
Owner XIANGTAN UNIV
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