Investigation of Static and Dynamic Seal Performances of a Rubber O-Ring

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Jie Zhang ◽  
Jingxuan Xie
Keyword(s):  
Friction Coefficient ◽  
Stress Distribution ◽  
Maximum Stress ◽  
Failure Modes ◽  
Fluid Pressure ◽  
Friction Torque ◽  
Reciprocating Motion ◽  
Sealing Performance ◽  
Dynamic Seal ◽  
Better Than

Rubber O-rings are widely applied in the static and dynamic seals of machinery, energy, chemical, aviation, and other fields. Mechanical behavior and sealing performance of the O-ring were investigated in this paper. Effects of precompression amount, fluid pressure, friction coefficient on the static and dynamic sealing performances of the O-ring were studied. The results show that the maximum stress appears on the inside but not surface of the O-ring. The static sealing performance increases with the increasing of fluid pressure and compression amount. Reciprocating dynamic sealing performance of the rubber O-ring is different with its static sealing performance; the stress distribution and deformation are changing in reciprocating motion. Sealing performance in outward stroke is better than it in the inward stroke. Overturn of the O-ring occurs when the friction torque is greater than the torque that caused by fluid pressure in the inward stroke. Distortion, bitten, and fatigue failure are the main failure modes of the O-ring in the dynamic seal. Those results can be used in design, installation, and operation of rubber O-rings in static and dynamic seals.

scholarly journals Design and seal performance analysis of bionic sealing ring for dynamic seal

Mechanika ◽  
2020 ◽  
Vol 26 (4) ◽  
pp. 338-345
Author(s):  
Yang HU ◽  
Jie ZHANG ◽  
Li Ming CHEN
Keyword(s):  
Friction Coefficient ◽  
Smooth Surface ◽  
Fluid Pressure ◽  
Rotating Machinery ◽  
Two Dimensional ◽  
Hydraulic Systems ◽  
Sealing Performance ◽  
Sealing Ring ◽  
Dynamic Seal ◽  
Better Than

In this paper, the non-smooth surface technology is applied to the surface structure of the rectangular sealing ring, and a bionic sealing ring is designed. Two-dimensional axisymmetric models of rectangular and bionic sealing rings were established. Effects of pre-compression amount, fluid pressure, friction coefficient and reciprocating velocity on the static and dynamic sealing performance of two sealing rings were studied. The results show that the seal performance of the bionic sealing ring is greater than that of rectangular. The static seal performance increases with the increasing of fluid pressure and compression amount. Dynamic sealing performance in outward stroke is better than it in the inward stroke. Friction coefficient has a smaller effect on the bionic sealing ring’s sealing performance than rectangular sealing ring. Therefore, using the bionic sealing ring can improve the static and dynamic seal performances and prolong its service life in hydraulic systems, rotating machinery and reciprocating machinery.

scholarly journals Modification and Redesign of GT Components

1998 ◽  
Author(s):  
Rahul D. Basu
Keyword(s):  
Stress Distribution ◽  
Weight Reduction ◽  
Maximum Stress ◽  
Failure Modes ◽  
Catastrophic Failure ◽  
Order Of Approximation ◽  
Main Rotor ◽  
Conical Shells ◽  
Material Parameters ◽  
Contour Plots

Description: Stress analysis of a GT engine fan shaft was performed for IN718 and Ti. A FE package NISA gave stiffness for unit radial and tangential loads. Results obtained with IN718 were compared with an earlier study by SNECMA. An extension of the study for weight reduction was done with Ti material parameters. The design was adapted to simplify a spring bearing mount for the HP (#3) bearing. A convoluted spring bearing mount suggested by SNECMA was redesigned using the results for the conical fan shaft to give a more gradual stress distribution. Such a structure would be less likely to yield in LCF and catastrophic failure modes. Comparison between computed results and tabulated results for conical shells was attempted. Results depended on loading and point of application and mounting. For instance, the fan shaft was fixed on the main rotor and a force applied to the rim and vice versa. Variation in the number of nodes and order of approximation also affected the results. Regions of maximum stress were shown in contour plots, while displacement studies gave modes of deflection.

scholarly journals Structural Design and Sealing Performance Analysis of Biomimetic Sealing Ring

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Chuanjun Han ◽  
Han Zhang ◽  
Jie Zhang
Keyword(s):  
Friction Coefficient ◽  
Contact Stress ◽  
Von Mises Stress ◽  
Stress Increase ◽  
Medium Pressure ◽  
Sealing Performance ◽  
Sealing Ring ◽  
Hardness Increase ◽  
Dynamic Seal ◽  
Von Mises

In order to reduce the failure probability of rubber sealing rings in reciprocating dynamic seal, a new structure of sealing ring based on bionics was designed. The biomimetic ring has three concave ridges and convex bulges on each side which are very similar to earthworms. Bulges were circularly designed and sealing performances of the biomimetic ring in both static seal and dynamic seal were simulated by FEM. In addition, effects of precompression, medium pressure, speed, friction coefficient, and material parameters on sealing performances were discussed. The results show that von Mises stress of the biomimetic sealing ring distributed symmetrically in no-pressure static sealing. The maximum von Mises stress appears on the second bulge of the inner side. High contact stress concentrates on left bulges. Von Mises stress distribution becomes uneven under medium pressure. Both von Mises stress and contact stress increase when precompression, medium pressure, and rubber hardness increase in static sealing. Biomimetic ring can avoid rolling and distortion in reciprocating dynamic seal, and its working life is much longer than O-ring and rectangular ring. The maximum von Mises stress and contact stress increase with the precompression, medium pressure, rubber hardness, and friction coefficient in reciprocating dynamic seal.

Sealing Performance Analysis of Cap Seal Rings in the Stirling Engine Piston Rod

2014 ◽  
Vol 697 ◽  
pp. 206-209
Author(s):  
Jun Chang
Keyword(s):  
High Speed ◽  
Friction And Wear ◽  
Stirling Engine ◽  
Reciprocating Motion ◽  
Working Environments ◽  
Engine Piston ◽  
Sealing Performance ◽  
Working Medium ◽  
Sealing Ring ◽  
Dynamic Seal

When the Stirling engine piston rod for reciprocating motion at a high speed under dry friction conditions, the temperature fall or pressure drop is mainly caused by uneven sealing ring deformation, increased wear and sealing performance fall. This article is introduced a cap seal rings of Stirling engine piston, study for friction and wear in theory under dynamic seal condition, and establish a rod seal test equipment to analysis the cap seal structure distortion and gauge wear in different working environments by experimental methods. Finally, come to the conclusion that when working medium pressure at 7 mpa, the cap seal performance is best.Keywords: Rod seal; cap seal structure; stress analysis

scholarly journals Sealing performance analysis of composite gaskets made of silicone rubber filled with ramie natural fibers

2019 ◽  
Vol 13 (4) ◽  
pp. 6178-6194
Author(s):  
Widodo W. S. ◽  
R. Soenoko ◽  
M. A. Choiron ◽  
A. A. Sonief
Keyword(s):  
Silicone Rubber ◽  
Water Pressure ◽  
Natural Fibers ◽  
Fluid Pressure ◽  
Ramie Fiber ◽  
Silicon Rubber ◽  
Sealing Performance ◽  
Internal Fluid ◽  
Rubber Composite ◽  
Better Than

Silicon rubber gaskets are commonly used in many industries for low pressure sealing conditions only. The research studies about the sealing performance improvement of a novel composite gasket made of the silicone rubber filled with ramie natural fibers in a bolted joint connection. In this research the sample of gasket consists of 4 different types of gasket i.e. a pure silicone rubber gasket and the silicone rubber composite gasket with 1, 2 and 3 layers of ramie fiber woven. The gaskets are tested using a water pressure testing equipment with a variation of internal fluid pressure and difference torques at 8 N.m, 12 N.m, 16 N.m and 20 N.m. The sealing performance is measured based on the maximum fluid pressure that can be hold by the gaskets before the fluid leaking occurred. The results show that the silicone rubber composite gaskets have better sealing performance comparing  with the pure silicone rubber gaskets where the silicon rubber gaskets capable to hold the internal fluid pressure until around 5 times rather  than pure silicon rubber gaskets (0.17 MPa comparing with 0.90 MPa). On the other hand the sealing performance of the composite gasket with 3 layers is almost 2 times better than the composite gasket with 1 layer and around 1.5 times better than the composite gasket with 2 layer of fiber woven.

scholarly journals Concept and setup of a multi-component facility for force and torque in the range of 1 MN and 2 kN·m

ACTA IMEKO ◽  
2014 ◽  
Vol 3 (2) ◽  
pp. 39
Author(s):  
Sebastian Baumgarten ◽  
Dirk Röske ◽  
Holger Kahmann ◽  
Dietmar Mauersberger ◽  
Rolf Kumme
Keyword(s):  
Friction Coefficient ◽  
Measurement Uncertainty ◽  
Friction Torque ◽  
Measuring Range ◽  
Tightening Torque ◽  
Prestressing Force ◽  
Measuring Facility ◽  
Better Than

This article describes the design of a measuring facility which can be used to investigate and calibrate so-called "friction coefficient sensors". These measuring facilities are used to measure the prestressing force and the tightening torque, resp. the friction torque of screws. These measurements are aimed at optimizing screw joints. The measuring facility described here is part of a force standard machine (fsm). In addition to the force which this system can realize with a very small measurement uncertainty of 0.002 % (<em>k</em> = 2) (in the measuring range from 20 kN to 1 MN), it can also generate an extremely precise torque (objective: better than 0.005 % at <em>k</em> = 2) in the range from 20 N·m to 2 kN·m.

Structural Optimization of Shield Machine Cutterhead Applied in Sandy Cobble Stratum

2014 ◽  
Vol 633-634 ◽  
pp. 1294-1298
Author(s):  
Li Wu ◽  
Jia Yuan Zhang ◽  
Tian Min Guan
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Structural Optimization ◽  
Structural Properties ◽  
Maximum Stress ◽  
Finite Element Models ◽  
Shield Machine ◽  
Better Than

With the aim of probing the optimal cutterhead structure for sandy cobble stratum in Beijing metro, four typical cutterhead structure are presented. The load on the cutterhead is calculated. The finite element models of cutterhead with thickness of 350 mm, 400 mm and 500 mm for each structure style are established respectively. By analyzing the stress distribution for each model, we find that the maximum stress of spoke-style cuttehead are lower than that on the board-style cutterhead; the structural properties of cutterhead with straight corbel are better than that with oblique corbel. Finally, the optimal cutterhead structure and size for sandy cobble stratum is selected.

scholarly journals Fretting Wear of Rubber Sealing Ring Caused by Fluid Pressure Fluctuation

Mechanika ◽  
2021 ◽  
Vol 27 (4) ◽  
pp. 321-326
Author(s):  
Yang Hu ◽  
Chuanjun HAN ◽  
Jie ZHANG ◽  
Zixuan LUO
Keyword(s):  
Friction Coefficient ◽  
Compression Ratio ◽  
Contact Region ◽  
Fluid Pressure ◽  
Fretting Wear ◽  
Factors Affecting ◽  
Gas Cylinder ◽  
Sealing Performance ◽  
Sealing Ring ◽  
Slip Region

In the process of gas charging and discharging of gas cylinder, the fluid pressure fluctuates causing fretting wear of rubber sealing ring, which affects the sealing performance. The model of O-ring that installed at the mouth of the gas cylinder was established to study the fretting wear in the static seal. Effects of fluid pressure, compression ratio, friction coefficient and temperature on the fretting wear of the O-ring were considered. The results show that the fretting wear of O-ring can be divided into non-contact region, slip region and sticky region. In the static seal, the compression ratio and friction coefficient are the main factors affecting the fretting wear. The sealing performance is greatly influenced on the compression ratio and it is less affected by the temperature. The junction of slip region and sticky region has the greatest probability of seal failure.

Research of the Connecting Form about the Spherical Shell and the Nozzle

2011 ◽  
Vol 413 ◽  
pp. 520-523
Author(s):  
Cai Xia Luo
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Finite Element Model ◽  
Spherical Shell ◽  
Maximum Stress ◽  
Peak Stress ◽  
Element Model ◽  
Small Opening ◽  
Large Opening ◽  
Reducing Stress

The Stress Distribution in the Connection of the Spherical Shell and the Opening Nozzle Is Very Complex. Sharp-Angled Transition and Round Transition Are Used Respectively in the Connection in the Light of the Spherical Shell with the Small Opening and the Large One. the Influence of the Two Connecting Forms on Stress Distribution Is Analyzed by Establishing Finite Element Model and Solving it. the Result Shows there Is Obvious Stress Concentration in the Connection. Round Transition Can Reduce the Maximum Stress in Comparison with Sharp-Angled Transition in both Cases of the Small Opening and the Large Opening, Mainly Reducing the Bending Stress and the Peak Stress, but Not the Membrane Stress. the Effect of Round Transition on Reducing Stress Was Not Significant. so Sharp-Angled Transition Should Be Adopted in the Connection when a Finite Element Model Is Built for Simplification in the Future.

The Stress Concentration Factors in Cylindrical Tubes with Transverse Circular Holes

1959 ◽  
Vol 10 (4) ◽  
pp. 326-344 ◽  
Author(s):  
H. T. Jessop ◽  
C. Snell ◽  
I. M. Allison
Keyword(s):  
Stress Concentration ◽  
Maximum Stress ◽  
Stress System ◽  
Complete Knowledge ◽  
Geometrical Shapes ◽  
Cylindrical Tubes ◽  
Circular Holes ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Better Than

The “frozen stress” techniques of photoelasticity can give a complete knowledge of the stress, system in a solid body, but the examination of the stresses requires more time and care than in corresponding flat plate tests. In tests on tubes with transverse circular holes, sponsored by The Royal Aeronautical Society, all practicable geometrical shapes are examined and the maximum stress is measured in tension, bending and torsion. The results are comprehensive and show the inadequacy of previous results. In all cases the maximum stress occurs inside the bore of the hole. The accuracy of all the graphs of stress concentration factors is better than five per cent.

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