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Method for finite element optimization of bolt pretightening force and bolt structural design

A technology of bolt pretightening force and bolt structure, applied in calculation, special data processing applications, instruments, etc., can solve the problems of difficult bolt structure optimization design, bolt pretightening force inconvenience, etc., achieve fast calculation, improve accuracy and reliability Good performance and reliability

Inactive Publication Date: 2012-12-19
章伊华
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Problems solved by technology

[0005] For overcoming above-mentioned deficiency, the purpose of the present invention is to provide a kind of method of finite element optimization bolt preload and bolt structure design to this field, make it solve existing finite element optimization bolt preload inconvenient and difficult to be used in bolt structure Technical Problems of Optimal Design

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  • Method for finite element optimization of bolt pretightening force and bolt structural design
  • Method for finite element optimization of bolt pretightening force and bolt structural design
  • Method for finite element optimization of bolt pretightening force and bolt structural design

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Embodiment Construction

[0026] Now combined with the accompanying drawings, that is, Figure 1 to Figure 4 As shown, the embodiments of the present invention are described in detail, and the purpose, features and advantages of the present invention are explained. The finite element method for optimizing the bolt pretightening force mainly includes the following steps.

[0027] 1. Establish the finite element analysis model of the bolted connection structure.

[0028] The present invention considers the geometric characteristics of the thread helix and the complex nonlinear factors in the component connection, refines the three-dimensional helical thread structure, and simplifies it into a two-dimensional symmetric problem without loss of accuracy; at the same time, the thread contact and stress concentration In order to obtain a more accurate stress state, the regional unit is locally refined, and the finite element analysis model of the bolted connection structure is as follows: figure 1 shown.

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Abstract

The invention relates to a method for finite element optimization of bolt pretightening force and bolt structural design. A two-dimensional FEA (finite element analysis) modified model and the method are applicable to structural modeling of different bolts. By considering various types of nonlinear factors such as complex contact, friction, pretightening in threaded connection, three-dimensional spiral thread structures are simplified effectively by the planar FEA modified model while calculation precision is guaranteed. The pretightening force and an external force are loaded step by step by inputting component parameters and material attributes and integrating nonlinear factor relationships. A curve of maximum stress changing along with the external force and a curve of changing of maximum stress inside the thread along with the pretightening force are defined according to stress status in the thread area. The optimal pretightening force of threaded connection is determined by judging whether contact faces are separated or not. Optimal bolt structural design and optimal parameters are calculated according to maximum external force borne by the bolt structure and the required pretightening force of the bolt structure. The method is also applicable to rectangular or other nonstandard threaded bolt structures.

Description

technical field [0001] The invention relates to the analysis and design of the bolt structure by using the finite element technique, and is a method for optimizing the pretightening force of the bolt and the design of the bolt structure by the finite element technique. Background technique [0002] The finite element method is called the matrix approximation method. It is a combination of modern mathematics and computer technology to simulate real physical systems (including geometry and load conditions but not limited to this). Its essence is to use calculus to discrete The equation is solved. The basic concept of finite element analysis (FEA) is to replace complex problems with simpler problems and then solve them. It regards the solution domain as composed of many small interconnected subdomains called finite elements, assumes a suitable (simpler) approximate solution for each unit, and then derives the total satisfaction conditions of this domain (such as structure equ...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 章伊华侯培海
Owner 章伊华
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