A Comprehensive Elastic-Plastic Model to Predict Wear and to Define the Optimum Geometry of Fretting Surfaces

World Tribology Congress III, Volume 2 ◽

10.1115/wtc2005-63451 ◽

2005 ◽

Cited By ~ 1

Author(s):

L. Gallego ◽

D. Ne´lias ◽

C. Jacq

Keyword(s):

Centrifugal Force ◽

Fretting Fatigue ◽

Relative Displacement ◽

Fretting Wear ◽

Turbine Engines ◽

Stick Slip ◽

Plastic Model ◽

Elastic Plastic ◽

Optimum Geometry

In turbine engines the contact between blades and disk may be subjected to fretting fatigue or fretting wear. This is due to the centrifugal force acting on the blade, which causes a relative displacement of the contacting surfaces producing either mixed stick-slip or gross slip.

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Fretting Wear Mechanisms and Their Effects on Fretting Fatigue

Journal of Tribology ◽

10.1115/1.3261663 ◽

1988 ◽

Vol 110 (3) ◽

pp. 517-524 ◽

Cited By ~ 33

Author(s):

Y. Berthier ◽

Ch. Colombie´ ◽

L. Vincent ◽

M. Godet

Keyword(s):

Fretting Fatigue ◽

Relative Displacement ◽

Contact Condition ◽

Fretting Wear ◽

Initial Contact ◽

Great Care ◽

Third Body ◽

Body Formation ◽

The Third ◽

Contact Surfaces

Fretting wear and fretting fatigue are governed by the rate of formation of materials (third-bodies) between the initial contact surfaces. Furthermore, the third-bodies must be maintained within the contact. The issue of the race between third-body formation and subsurface damage conditions the effect of fretting on fatigue. That race lasts for only a few hundred or at best a few thousand cycles. Effective third-bodies (or good anti-fretting lubricants) must adhere strongly to the rubbing surfaces, and be able to accommodate at least part of the relative displacement. Great care in the design of test equipment has to be exercised before definitive results on the effect of amplitude and frequency on either fretting fatigue or fretting wear can be obtained for a given contact condition, given materials and given environments.

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The Fretting Wear Characteristics of CrN and TiN Coating on Steam Generator Tube

STLE/ASME 2010 International Joint Tribology Conference ◽

10.1115/ijtc2010-41147 ◽

2010 ◽

Author(s):

Jin-Seon Kim ◽

Joo Hoon Choi ◽

Young-Ze Lee

Keyword(s):

Steam Generator ◽

Nuclear Power ◽

Relative Displacement ◽

Fretting Wear ◽

Improve Performance ◽

Tin Coating ◽

Stick Slip ◽

Steam Generator Tube ◽

Lower Load ◽

Flow Induced Vibrations

A steam generator tube of a nuclear power plant is damaged by a fretting phenomenon caused by flow induced vibrations (FIV). In this work, the surface of the tube was coated with CrN or TiN as a measure to improve performance of the fretting wear resistance. Fretting wear regime was classified by determining a phase difference between friction and relative displacement signals and contact characteristics were analyzed. As a result, coating increased the friction coefficient. At a lower load, contact condition shifted from gross slip to stick slip.

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AN ELASTIC-PLASTIC MODEL FOR FATIGUE CRACK GROWTH AT NOTCHES

Fatigue & Fracture of Engineering Materials & Structures ◽

10.1111/j.1460-2695.1994.tb00263.x ◽

1994 ◽

Vol 17 (6) ◽

pp. 651-660 ◽

Cited By ~ 11

Author(s):

H. Y. Ahmad ◽

J. R. Yates

Keyword(s):

Fatigue Crack ◽

Fatigue Crack Growth ◽

Crack Growth ◽

Plastic Model ◽

Elastic Plastic

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Fretting fatigue strength estimation considering the fretting wear process

Tribology International ◽

10.1016/j.triboint.2006.02.049 ◽

2006 ◽

Vol 39 (10) ◽

pp. 1100-1105 ◽

Cited By ~ 33

Author(s):

Toshio Hattori ◽

Takashi Watanabe

Keyword(s):

Fatigue Strength ◽

Fretting Fatigue ◽

Fretting Wear ◽

Wear Process

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Stick-Slip Compensation of Micro-Positioning Using Elastic-Plastic Static Friction Model

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.47-50.246 ◽

2008 ◽

Vol 47-50 ◽

pp. 246-249

Author(s):

Min Gyu Jang ◽

Chul Hee Lee ◽

Seung Bok Choi

Keyword(s):

Static Friction ◽

Friction Model ◽

Smart Structure ◽

Asperity Contact ◽

Stick Slip ◽

Elastic Plastic ◽

Highly Nonlinear ◽

Bridge Type ◽

Structural Parts ◽

Rough Surface Contact

In this paper, a stick-slip compensation for the micro-positioning is presented using the statistical rough surface contact model. As for the micro-positioning structure, PZT (lead(Pb) zirconia(Zr) Titanate(Ti)) actuator is used to drive the load for precise positioning with its high resolution incorporating with the PID (Proportional Integral Derivative) control algorithm. Since the stick-slip characteristics for the micro structures are highly nonlinear and complicated, it is necessary to incorporate more detailed stick-slip model for the applications involving the high precision motion control. Thus, the elastic-plastic static friction model is used for the stick-slip compensation considering the elastic-plastic asperity contact in the rough surfaces statistically. Mathematical model of the system for the positioning apparatus was derived from the dynamic behaviors of structural parts. Since the conventional piezoelectric actuator generates the short stroke, a bridge-type flexural hinge mechanism is introduced to amplify the linear motion range. Using the proposed smart structure, simulations under the representative positioning motion were conducted to demonstrate the micro-positioning under the stick-slip friction.

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