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Research Papers: Design and Analysis

Nonlinear Deformation Behavior of Bolted Flanges Under Tensile, Torsional, and Bending Loads

[+] Author and Article Information
Zhijun Wu, Xianjie Yang

Fastening and Joining Research Institute,
Department of Mechanical Engineering,
Oakland University,
Rochester, MI 48309

Sayed A. Nassar

Fellow ASME
Fastening and Joining Research Institute,
Department of Mechanical Engineering,
Oakland University,
Rochester, MI 48309

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received May 12, 2011; final manuscript received July 30, 2014; published online September 4, 2014. Assoc. Editor: Donald Mackenzie.

J. Pressure Vessel Technol 136(6), 061201 (Sep 04, 2014) (8 pages) Paper No: PVT-11-1121; doi: 10.1115/1.4028137 History: Received May 12, 2011; Revised July 30, 2014

A bolted flange may be subjected to the axial tensile, torsional, and bending external loads in service. The axial tensile, torsional, and bending resistance of the bolted flange is vital for the system vibration, dynamic strength, and reliability. This paper investigates the nonlinear deformation behavior of bolted flanges under tensile, torsional, and bending loads, using finite element analysis (FEA). Even though the bolted flange materials may still deform elastically, the variation in contact area due to the external loading may still cause nonlinear deformation of the flanges. In this study, finite element simulation is used for investigating the respective nonlinear deformation behavior of a preloaded bolted flange under tensile, torsional, and bending loads, and to determine the corresponding stiffness values for each loading.

Copyright © 2014 by ASME
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References

Figures

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Fig. 1

Finite element model

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Fig. 2

Geometry of the slip-on flange

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Fig. 3

Relative displacement of flanges versus external tensile force with different bolt preloads

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Fig. 4

Applied tensile force versus total six bolt tension and flange clamping force with different bolt preloads

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Fig. 5

Relative displacement versus total reaction force with different interface friction coefficients when bolt preloads are 40,000 N

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Fig. 6

Relative rotational angle of flanges versus applied external torsional moment with different bolt preload levels

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Fig. 7

Relative rotational angle of flanges versus bolt tension variation with different bolt preload levels

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Fig. 8

Relative torsional angle of flanges versus applied external torsional moment with 40,000 N of bolt preload

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Fig. 9

The simplified schematic for bending on bolted flange

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Fig. 10

Bending angle versus bending moment with various preloads

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Fig. 11

Bolts position and numbering scheme on the flange and the bending moment direction

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Fig. 12

Bolt tension variations with applied bending moment with bolt preload of 40,000 N

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Fig. 13

Normalized bolt tension variation of bolt 6 versus applied bending moment with different bolt preload levels

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Fig. 14

Bending angle versus total clamp force with various preloads

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Fig. 15

Contact pressure distributions at flange interface (a) 10,000 N initial bolt preload (b). 1285 Nm bending moment

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Fig. 16

Bending angle versus applied bending moment with different cases of interface friction coefficient

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