Numerical and Experimental Study of Elastic Interaction in Bolted Flange Joints

Author:

Zhu Linbo1,Bouzid Abdel-Hakim2,Hong Jun1

Affiliation:

1. State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China e-mail:

2. Professor Fellow ASME Department of Mechanical Engineering, Ecole de Technologie Superieure, 1100 Notre-Dame Ouest, Montreal, QC H3C 1K3, Canada e-mail:

Abstract

Bolted flange joints are widely used to connect pressure vessels and piping equipment together and facilitate their disassembly. Initial tightening of their bolts is a delicate operation because it is extremely difficult to achieve the target load and uniformity due to elastic interaction. The risk of failure due to leakage and fatigue under service loading is consequently increased. This paper presents a study on the effect of elastic interaction that is present during the tightening of bolted flange joints using three-dimensional nonlinear finite-element modeling and experimentation. The nonlinear nonelastic behavior of the gasket is taken into account in the numerical simulation. The scatter in bolt preload produced during the tightening sequence is evaluated. Based on the elastic interaction coefficient method, the initial target tightening load in each bolt for every pass is determined by using the nonlinear finite-element model to obtain a uniform preload after the final tightening pass. The validity of the finite-element analysis (FEA) is supported by experimental tests conducted on a NPS 4 class 900 weld neck bolted flange joints using fiber and flexible graphite gaskets. This study provides guidance and enhances the safety and reliability of bolted flange joints by minimizing bolt load scatter due to elastic interaction.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality

Reference15 articles.

1. Bolted Flange Assembly: Preliminary Elastic Interaction Data and Improved Bolt-Up Procedures;Bull. Weld. Res. Counc.,1996

2. An Improved Flange Bolt-Up Procedure Using Experimentally Determined Elastic Interaction Coefficients;ASME J. Pressure Vessel Technol.,1992

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