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
View PDF4 Cites 36 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 struct...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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.

[...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F17/50
Inventor 章伊华侯培海
Owner 章伊华
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap