Leakage analysis of bolted flange joints considering surface roughness: A theoretical model

2017 ◽  
Vol 232 (2) ◽  
pp. 203-233 ◽  
Author(s):  
Benben Ma ◽  
Fan Jin ◽  
Zhi Sun ◽  
Xu Guo
Keyword(s):  
Surface Roughness ◽  
Theoretical Model ◽  
Three Dimensional ◽  
Element Analysis ◽  
Low Leakage ◽  
Theoretical Predictions ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Bolted Flange ◽  
Bolt Spacing

In the present paper, a theoretical model for leakage analysis of bolted flange joints without gaskets, which can take the surface roughness into consideration, is proposed based on percolation theory. In this model, Persson’s rough contact theory is employed to predict the height of the critical constriction along the percolating path. Based on this model, a criterion of maximum allowable bolt spacing is also suggested to guarantee a low leakage rate. The reasonable agreement between the theoretical predictions and detailed three-dimensional finite element analysis results verifies the validity and usefulness of the proposed theoretical model.

Apparent Stiffness of a Bolted Flange

1995 ◽  
Author(s):  
Robert B. McKee ◽  
Harshavardhan Reddy
Keyword(s):  
Finite Element Analysis ◽  
Three Dimensional ◽  
Element Analysis ◽  
Apparent Stiffness ◽  
Dimensional Finite Element ◽  
Flat Steel ◽  
Three Dimensional Finite Element ◽  
Bolted Flange ◽  
Bolt Spacing ◽  
Outside Diameter

Abstract A flat steel flange clamped by 14 bolts was modelled by three dimensional finite element analysis to evaluate its stiffness in compression relative to each bolt. The bolt load was applied via an extremely stiff washer to eliminate the effect of bolt head deflection on the results. The dimensionless stiffness varied linearly with bolt aspect ratio d/L. The slope of this relation was equal to that predicted by a simple cylindrical model with outside diameter of 1.56 d. The pressure between flanges along the bolt circle was calculated for two values of bolt spacing.

scholarly journals STAMINA OF A GASKETED BOLTED FLANGED PIPE JOINT UNDER DYNAMIC LOADING

2016 ◽  
Vol 17 (2) ◽  
pp. 137-155
Author(s):  
Muhammad Abid
Keyword(s):  
Three Dimensional ◽  
Operating Conditions ◽  
Axial Loads ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Dynamic Operating ◽  
Critical Components ◽  
Three Dimensional Finite Element ◽  
Bolted Flange ◽  
Pipe Joint

Gasketed bolted flange joints are the most critical components in pipelines for their sealing and strength under operating conditions. Most of the work available in literature is under static loading, whereas in industry, cyclic loads are applied due to the vibrating machinery such as motors, pumps, sloshing in offshore applications and in the ships etc. In this study a three dimensional finite element analysis of a gasketed joint is carried out using a spiral wound gasket under bolt up and dynamic operating conditions (internal pressure, axial and bending) singly and in combination. The cyclic axial loads are concluded relatively more challenging for both the sealing and strength of the joint. Higher magnitudes of loads and frequencies are also observed more challenging to the joints performance.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

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