Method of calculating and analyzing temperature and stress strain finite elements of earth stud after being powered on

A grounding bolt, stress-strain technology, applied in the field of simulation calculation, can solve the problem of coupling calculation of grounding bolt temperature, stress and strain, etc., and achieve the effect of accurate results

Inactive Publication Date: 2015-12-23
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

[0004] However, there is no coupling calculation of the temperature, stress and strain of the grounding bolt after the current is applied.

Method used

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  • Method of calculating and analyzing temperature and stress strain finite elements of earth stud after being powered on
  • Method of calculating and analyzing temperature and stress strain finite elements of earth stud after being powered on
  • Method of calculating and analyzing temperature and stress strain finite elements of earth stud after being powered on

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Embodiment Construction

[0052] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0053] see figure 1 Implementation process of numerical simulation method.

[0054] An embodiment of the finite element calculation and analysis method for temperature and stress-strain after the grounding bolt is energized, including the following steps:

[0055] S1. Carry out the experimental measurement of the current passing through the grounding bolt, and collect the data after the bolt is passed through with different currents. Collect the surface temperature and deformation of the ground bolt after different current gradients (specifically 300A, 1000A, 2000A) are applied. The current gradient is set from the rated current to the limit current, because the grounding bolt has the danger of explosion in an instant when a large current is applied, so safety measures must be taken during the entire test process.

[0056] S2. In the AutoCAD modeling softw...

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Abstract

The invention belongs to the technical field of simulating calculation and relates to a method of calculating and analyzing temperature and stress strain finite elements of an earth stud after being powered on. The method includes the steps that firstly, power-on test measurement of the earth stud is conducted, and data of the stud obtained after different currents are introduced are collected; then, Auto CAD is utilized to build a geometric model, the geometric model is introduced into simulation calculation software COMSOL Multiphysics, a physical model is built in the software, and material parameters are set; boundary conditions are dynamically checked and modified according to the test data and the calculation result, and an optimum scheme of boundary condition setting of the earth stud obtained after being powered on is obtained; finally, finite element meshes are built, calculation is conducted, the calculation result is derived into the data analysis software, and the evolution situations of the temperature, the stress and the strain of the stud under the condition that different currents are introduced are obtained. By means of the method, the modeling calculation result of the temperature and stress strain of the earth stud obtained after the current is introduced is made to be more accurate, and support is provided for the test measurement of the earth stud.

Description

technical field [0001] The invention belongs to the technical field of simulation calculation, and specifically relates to a finite element analysis and calculation method for the temperature and stress-strain of the grounding bolt after electrification. The change of stress and strain is analyzed by finite element calculation. Background technique [0002] As a widely used connection method in connection structures, bolt connection is the most common and important connection method in the field of steel structure, and plays an important role in industrial and civil fields. The main manufacturing material of bolts is steel, because steel is not resistant to high temperature, so as the temperature rises, the performance of steel will change greatly (such as a sharp decline in mechanical properties). After the grounding bolt is fed with current, Joule heat will be generated, and the temperature rise will cause the stress and strain of the bolt to change. The effect of this J...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 卢凯黄文曾慧中
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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