Other (Seals, Manufacturing)

Creep Constitutive Law of Packing Materials Based on Relaxation Tests

[+] Author and Article Information
Mohammed Diany

University Sultan Moulay Slimane,  Faculté des Sciences et Techniques, BP 523 Beni Mellal 23000,Beni Mellal Moroccomdiany@yahoo.com

Abdel-Hakim Bouzid1

 Ecole de Technologie Superieure, 1100 Notre-Dame Ouest, Montreal (Quebec) Canada H3C 1K3hakim.bouzid@etsmtl.ca


Corresponding author.

J. Tribol 134(1), 012202 (Feb 24, 2012) (8 pages) doi:10.1115/1.4005773 History: Received June 30, 2011; Revised January 06, 2012; Published February 21, 2012; Online February 24, 2012

The tightness of valves, compressors and pumps is ensured by superposed braided rings installed in a stuffing-box system. The nature of the packing material and structure, which is like a rectangular braided cord, influences the proper stuffing-box assembly behavior. During installation, a minimum compressive load is required to ensure a minimum level of tightness. A fairly large percentage of this axial compression load is transferred to the radial direction to generate the contact pressures at the packing-stem and packing-housing interfaces necessary for sealing.The packing is considered in several studies as a viscoelastic material with its creep-relaxation behavior assumed as one-dimensional rheological model. In the present work, relaxation tests in a test-bunch containing all the components of the packed stuffing-box, are carried out to define a creep constitutive law for packing braids of different materials. Based on three-dimensional compression tests the developed method is applied to three different packing materials.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Packed stuffing-box

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Figure 2

Analytical model

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Figure 3

The stuffing box packing test bench

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Figure 4

Schematic of the test fixture

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Figure 5

Housing FE model

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Figure 6

Packed stuffing-box FE model

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Figure 7

Relaxation of axial packing stress

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Figure 8

Hoop strain at housing OD for FG packing

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Figure 9

Relationship between hoop strain and σr

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Figure 10

Lateral pressure coefficient variation with time

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Figure 11

Bulk modulus variation with time

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Figure 12

Shear modulus variation with time

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Figure 13

Bulk modulus for FG packing

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Figure 14

Shear modulus for PTFE packing

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Figure 15

Experimental and FE compressive stress



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