Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (9): 2451-2459.doi: 10.13229/j.cnki.jdxbgxb.20221393

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Analysis of bolt load uniformity under convex flange connection

Ling LI(),Xu-yang DU,Jing-jing WANG,Xiao-guang RUAN(),An-jiang CAI   

  1. School of Mechanical and Electrical Engineering，Xi'an University of Architecture and Technology，Xi'an 710055，China
  • Received:2022-11-01 Online:2024-09-01 Published:2024-10-28
  • Contact: Xiao-guang RUAN E-mail:liling@xauat.edu.cn;rxgly@126.com

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Abstract:

The study aims to optimize the uniformity of bolt preload by constructing elastic interaction models and optimizing the flange connection with convex surfaces. The elastic interaction coefficient method is extended to multiple tightening processes， and the initial preload of all bolts at each tightening step is predicted by the analytical model. A three-dimensional finite element model is established to verify its accuracy and explore the effects of tightening sequence and steps. The results show that the symmetric tightening method of three steps minimizes the elastic interaction and improves the uniformity of preload. The model considering elastic interaction further optimizes the uniformity， closer to the target value. This method effectively solves the problem of uneven preload and provides scientific basis for the safety and reliability design of bolt flange structures.

Key words: bolted flange connection, elastic interaction, preload, load uniformity

CLC Number: 

  • TG95

Fig.1

Two-dimensional drawing of NPS4-900 flange"

Fig.2

Finite element model of bolt flange connection structure"

Table 1

Simulation of condition"

序号加载方式备注
1拧紧顺序

对称拧紧

顺序拧紧

间歇拧紧

2拧紧步数

一步

三步

Fig.3

Tightening sequence"

Fig.4

Numerical and experimental analysis of symmetric tightening"

Fig.5

Intermittent tightening bolt preload"

Fig.6

Sequential tightening bolt preload"

Fig.7

Symmetrical tightening bolt preload"

Fig.8

One-time tightening bolt preload"

Fig.9

Three times tightening bolt preload"

Fig.10

Pre-tightening force applied by each bolt for each tightening step"

Fig.11

Comparison of final preload considering elastic interaction and not considering elastic interaction"

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