| Probabilistic Sensitivity Analysis of Fretting Fatigue (Preprint) |
Apr-2009 |
14 pages |
| Authors:
Patrick J Golden; Harry R Millwater; Xiaobin Yang; TEXAS UNIV AT SAN ANTONIO DEPT OF MECHANICAL ENGINEERING AND BIOMECHANICS
|
 | A probabilistic analysis of the fatigue life of specimens subject to fretting fatigue was carried out. A mechanics based fretting life analysis was applied that accounted for the local stress gradient at the edge of contact. The random variables in the analysis included the initial crack size, coefficient of friction, crack growth rate law, and the contact pad profile. The variation in pad profiles was determined through statistical analysis of ... |
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| Effects of Contact Load on the Fretting Fatigue Behavior of IN-100 at Elevated Temperature |
Mar-2009 |
173 pages |
| Authors:
Traylor; Alfred G II; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This thesis studied the effects of contact load of 8006 N on the fretting fatigue behavior of IN-100 at an elevated temperature of 600 deg C. First, S-N curves were created for a range of applied axial stresses at an identical stress ratio of 0.03 at 8006 N. A condition of partial slip condition necessary to fretting fatigue was verified by generating hysteresis loops, plotting shear force against axial stress. ... |
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| The Effect of Elevated Temperature on the Fretting Fatigue Behavior of Nickel Alloy IN-100 |
APR 2008 |
122 pages |
| Authors:
John F. Ownby; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This thesis studied the effect of elevated temperature (600 C) on the fretting fatigue behavior of IN-100. First, fretting and plain fatigue S-N curves were determined over a large range of applied stress at an identical stress ratio of 0.03 at 600 C and for fretting tests, with a constant contact load. The partial slip condition was verified by using hysteresis between shear force and axial stress techniques. The contact ... |
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| Investigation into Fretting Fatigue Under Cyclic Contact Load and in Conjunction with Plain Fatigue of Titanium Alloy |
MAR 2008 |
169 pages |
| Authors:
Abdulla Al-Noaimi; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Fretting fatigue is the surface damage that occurs at the interface between two components that are under going a small amplitude oscillatory movements. It results in a reduction of the material life comparing to the plain fatigue. Most of the previous works were accomplished under a constant applied contact load and a little effort has been done under a variable contact load, while none of these studies have taken the ... |
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| Influence of Residual Stresses on Fretting Fatigue Life Prediction in Ti-6Al-4V |
Jan-2008 |
28 pages |
| Authors:
Patrick J Golden; Dennis Buchanan; Sam Naboulsi; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| The objective of this work was to evaluate life prediction methodologies involving fretting fatigue of turbine engine materials with advanced surface treatments. Fretting fatigue tests were performed on Ti-6Al-4V dovetail specimens with and without advanced surface treatments. These tests were representative of the conditions found in a turbine engine blade to disk attachment. Laser shock processing and low plasticity burnishing have been shown to produce deep compressive residual stresses with ... |
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| Influence of Residual Stresses on Fretting Fatigue Life Prediction in Ti-6Al-4V (POSTPRINT) |
Jan-2008 |
14 pages |
| Authors:
Patrick J Golden; Dennis Buchanan; Sam Naboulsi; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| The objective of this work was to evaluate life prediction methodologies involving fretting fatigue of turbine engine materials with advanced surface treatments. Fretting fatigue tests were performed on Ti-6Al-4V dovetail specimens with and without advanced surface treatments. These tests were representative of the conditions found in a turbine engine blade to disk attachment. Laser shock processing and low plasticity burnishing have been shown to produce deep compressive residual stresses with ... |
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| Unlubricated Gross Slip Fretting Wear of Metallic Plasma Sprayed Coatings for Ti6A14V Surfaces |
NOV 2006 |
37 pages |
| Authors:
Jr. Hager Carl H.; Jeffrey H. Sanders; Shashi K. Sharma; UNIVERSAL TECHNOLOGY CORP DAYTON OH
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| Plasma sprayed Al-bronze (Al-Br) or CuNiIn coatings are often applied to protect against fretting wear and extend the operational life of Ti-alloy compressor blades in turbine engines. In order to develop a fundamental understanding of how these coating systems perform under gross slip fretting conditions, bench level fretting wear tests were conducted at room temperature to simulate cold engine startup. Alternative coatings such as plasma sprayed molybdenum and nickel were ... |
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| Effects of Phase Difference Between Axial and Contact loads on Fretting Fatigue Behavior of Titanium Alloy. |
SEP 2006 |
164 pages |
| Authors:
Mohammad Almajali; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| movement. It results in a reduction of the material life as compared to the plain fatigue. Most of the previous works were accomplished under a constant applied normal load and a little effort was done under a variable contact load, while none of these studies have considered the phase difference between the axial and the contact load. The primary goal of this study is to investigate the effect of phase ... |
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| Wear Analysis of CU-AL Coating on TI-6AL-4V Under Fretting |
05 JUN 2006 |
75 pages |
| Authors:
Karl N. Murray; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The effects of changes in the coefficient of friction (CoF) between the contacting surfaces on the fretting wear characteristics of Cu-Al coating on Ti-6Al-4V were investigated. This Cu-Al coating is part of a system that is applied to titanium turbine blades to reduce fretting at the interface. In the application, there is a solid lubricant that is added on top of the coating as an assembly aid and to help ... |
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| Life Prediction of Fretting Fatigue with Advanced Surface Treatments (Preprint) |
MAY 2006 |
25 pages |
| Authors:
Patrick J. Golden; Michael J. Shepard; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| Laboratory fretting results with diamond like carbon coating, low plasticity burnishing, and laser shock processing as well as with no surface treatments are presented. A method of life prediction for a dovetail type specimen is demonstrated with the laboratory results. In general, the life prediction calculations agree with the laboratory results when the appropriate coefficient of friction and compressive residual stresses are accounted for in the analysis. Some of the ... |
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| Fretting Fatigue Behavior of Shot-Peened IN 100 |
MAR 2006 |
134 pages |
| Authors:
Jonathan L. Ng; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| The fretting fatigue behavior of shot-peened of IN 100 was investigated in this study. S-N curves were obtained for two different shot-peened intensities (7A and 12A) and were compared to those of unpeened specimens. Stress relaxation behavior under fretting fatigue was also investigated after their measurements were obtained using the X-ray diffraction method. The crack initiation location and the crack angle orientation along the surface were determined using optical and ... |
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| Fretting Fatigue Behavior of Nickel Alloy IN-100 |
MAR 2006 |
135 pages |
| Authors:
Elhoucine Madhi; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS
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| In this study, a systematic investigation of the fretting fatigue behavior of nickel alloy, IN-100 was carried out. The study includes both experimental work and the corresponding analysis of the contact conditions, and the latter is accomplished using the finite element method. Fretting fatigue tests were performed over a wide range of axial stresses to examine both low and high cycle fretting fatigue under constant contact load and the influence ... |
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| Comparative Analysis of Three Fretting Fatigue Fixtures (Preprint) |
FEB 2006 |
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| Authors:
Patrick J. Golden; Alisha L. Hutson; Bence B. Bartha; Theodore Nicholas; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS MANUFACTURING DIR/SYSTEMS SUPPORT DIV
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 | Three fixtures for conducting laboratory fretting fatigue tests are described and their respective testing methods and the results of the analysis are compared. Each of these fixtures has been used to investigate the effects of various parameters of interest in fretting fatigue. These fixtures include a unique apparatus in which all load applied to the specimen is transferred to the fretting pads, an apparatus similar to many found in the ... |
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| Fundamentals of Fretting Applied to Anisotropic Materials. High-Temperature Fretting Fatigue of Single-Crystal Nickel |
DEC 2005 |
101 pages |
| Authors:
T. N. Farris; H. Murthy; PURDUE UNIV LAFAYETTE IN SCHOOL OF AERONAUTICS AND ASTRONAUTICS
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| The objective of this program was to determine the fatigue crack growth portion of the dissimilar fretting fatigue tests in order to improve the accuracy of the equivalent stress method used to predict the fretting fatigue lives for the single crystal nickel on INl00 attachment fatigue tests. These analyses will give further confidence in the ability to determine endurance limits for attachment fatigue issues associated with these advanced materials. |
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| Effects of Temperature and Shot-Peening Intensity on Fretting Fatigue Behavior of Titanium Alloy TI-6AL-4V |
MAR 2005 |
154 pages |
| Authors:
Salman Albinali; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| Effects of temperature and shot-peening intensity on fretting fatigue behavior of Ti-6Al-4A were investigated in this study. S-N curves were obtained for both room and elevated temperatures (260 C) for two different shot-peened intensities (4A and 10A). Stress relaxation behavior under both fretting fatigue at elevated temperature and temperature exposure only were also investigated after their measurements were calculated using X-ray diffraction method. The crack initiation location and the crack ... |
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| Effects of Variable Contact Load on Fretting Fatigue Behavior of Shot- Peened and Un-Peened Titanium Alloy |
DEC 2004 |
230 pages |
| Authors:
Chia-hwa Lee; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| Fretting fatigue occurs between two components in contact under relative motion and reduces fatigue life when compared with plain fatigue. Shot- peening, on the other hand, is the most commonly used cold working process to improve material fatigue resistance in aeronautical industries. Nearly all work accomplished to date has assumed a constant contact load while investigating fretting fatigue. The primary goal of this study was to explore fretting fatigue behavior ... |
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| Effects of Polishing Shot-Peened Surfaces on Fretting Fatigue Behavior of Ti-6Al-4V |
SEP 2004 |
84 pages |
| Authors:
Kasey Scheel; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| The research of this thesis was done to investigate the effects of polishing a shot-peened specimen of Ti-6Al-4V on the fretting fatigue life of that specimen. The shot-peening process, though one of the most beneficial techniques in prolonging fretting fatigue life, creates a textured surface that may lead to problems on the micro level. This research was done in an attempt to further improve the peening process by examining the ... |
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| Length Scale Considerations in the Formation of Attachment Fatigue Cracks |
AUG 2004 |
17 pages |
| Authors:
Richard W. Neu; David L. McDowell; GEORGIA INST OF TECH ATLANTA SCHOOL OFMECHANICAL ENGINEERING
|
| Fretting fatigue is often the root cause of nucleation of high cycle fatigue (HCF) cracks in clamped components. Fretting fatigue damage accumulation occurs within depths of only a few grains at the interface between contacting components. Therefore, more accurate assumptions concerning length scale, damage volume, and material models are needed to establish a more solid physical foundation underlying fretting fatigue life prediction methods. In particular, the influence of crystallographic orientation ... |
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| Elevated Temperature Fretting Facility |
JUL 2004 |
5 pages |
| Authors:
Richard W. Neu; GEORGIA INST OF TECH ATLANTA SCHOOL OFMECHANICAL ENGINEERING
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| The primary equipment purchased is a Phoenix Tribology Ltd. DN55 High Temperature Sliding and Fretting Machine. The machine was designed from the ground up specifically for high temperature (up to 8OOoC) fretting experiments. The system has lower mass actuator system which is ideal for fretting and reciprocal sliding experiments to enable cycling at higher frequencies (up to 500 Hz) while minimizing dynamic effects. The system can also perform reciprocating sliding ... |
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| Modelling Attempts to Predict Fretting-Fatigue Life on Turbine Components |
01 JUN 2004 |
12 pages |
| Authors:
Hernan V. Arrieta; Patrick Wackers; Ky D. Van; Andrei Constantinescu; Habibou Maitournam; MTU AERO ENGINES GMBH MUNCHEN (GERMANY)
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| Whenever two or more turbine components are in tight contact, Fretting-Fatigue becomes a relevant failure mechanism. Despite of on-going research on Fretting Fatigue, life prediction under fretting conditions continues being a challenge. To analytically predict fretting-fatigue life, key driving factors need to be identified and quantified in mechanical terms (stress and strain). Due to the intrinsic characteristics of contact, stress and strain fields around contact areas evolve with the loading ... |
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| Fretting Fatigue Behavior of the Titanium Alloy Ti-6AL-4V Under Seawater Conditions |
MAR 2004 |
129 pages |
| Authors:
Lewis C. Lietch; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| The fretting fatigue behavior of Ti-6A1-4V was investigated in laboratory air and under a controlled environment consisting of synthetic seawater. Fretting fatigue tests were performed for both low and high cycle fatigue regimes. Finite element analysis was utilized to model and analyze the experimental data. The applied stress range and the Modified Shear Stress Range were evaluated as potential fatigue parameters. The results found from this study can be summarized ... |
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| Fretting Fatigue Model |
FEB 2003 |
55 pages |
| Authors:
C. L. Brooks; S. A. Prost-Domasky; K. T. Honeycutt; T. B. Mills; N. Young; APES INC ST LOUIS MO
|
| The multitask objectives of the plan discussed in this proposal are to research the role and effects of fretting on structural life of components; develop and demonstrate the feasibility of integrating candidate fretting fatigue predictive analytic model(s) into structural integrity methods; integrate and implement the techniques for applications to present and future U. S. military weapons programs, commercial aviation, automotive, and mechanical equipment; and provide industry access to the predictive ... |
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| Characterization of Fretting Fatigue Crack Initiation Processes in CR ti-6Al-4V |
FEB 2003 |
13 pages |
| Authors:
A. L. Hutson; C. Neslen; T. Nicholas; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
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| A study was conducted to quantify fretting fatigue damage and to evaluate the residual fatigue strength of specimens subjected to a range of fretting fatigue test conditions. Flat Ti-6Al-4V specimen were tested against flat Ti-6Al-4V fretting pads with blending radii at the edges of contact. Fretting fatigue damage for two combinations of static average clamping stress and applied axial stress was investigated for two percentages of total life. Accumulated damage ... |
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| Restoring Fatigue Performance of Corrosion Damaged Aa7075-T6 and Fretting in 4340 Steel with Low Plasticity Burnishing |
SEP 2002 |
8 pages |
| Authors:
Paul S. Prevey; John T. Cammett; LAMBDA RESEARCH CINCINNATI OH
|
| Corrosion related fatigue in aluminum structural alloys and fretting damage in high strength steels are primary failure mechanisms that reduce the structural integrity of aging aircraft. A chemically active environment, susceptible material and static and/or alternating tensile stresses are all required for failure. Conventional approaches to mitigate corrosion and fretting related failure mechanisms address either elimination of the corrosive environment with coatings, substitution or modification of alloys, or changes in ... |
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| Effects of Shot-Peening on High Cycle Fretting Fatigue Behavior of Ti- 6Al-4V |
26 MAR 2002 |
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| Authors:
Halil I. Yuksel; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| Effects of Shot-peening on High Cycle Fretting Fatigue behavior of Ti-6Al-4V were investigated. Experiments were performed with 6.35 mm thick specimens which provided S/N curves. After the tests, it was observed that the specimens failed near the trailing edge of contact. Scanning Electron Microscopy showed that cracks initiated on the contact surface for 6.35 mm, and at the depth of specimen ranging from 200 to 300 microns for 3.81 mm ... |
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| Fretting Fatigue Behavior of a Titanium Alloy Ti-6AL-4V at Elevated Temperature |
MAR 2002 |
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| Authors:
Onder Sahan; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| The purpose of this research is to investigate the fretting fatigue behavior of the titanium alloy Ti-6Al-4V at elevated temperature is investigated. Fretting and plain fatigue experiments are conducted at 260 . Crack initiation location and crack initiation orientation is measured and fretting and plain fatigue life data of the specimens from these tests are obtained. Fatigue parameters capable of predicting the number of cycles to specimen failure, the crack ... |
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| Examination of Contact Width on Fretting Fatigue |
MAR 2002 |
186 pages |
| Authors:
Russell S. Magaziner; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The primary goal of this study was to find the effects on the fretting fatigue life when systematically holding the fretting fatigue variables, peak contact pressure, maximum/minimum nominal bulk stress, and the ratio of shear traction to pressure force constant while varying the contact semi-width through changes in pad radius and normal load. Experimental tests were performed on a test setup capable of independent pad displacement. Analytical and finite element ... |
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| Quantitative Characterization of Fretting Damage in Aircraft Turbine Disks |
NOV 2000 |
18 pages |
| Authors:
Joseph N. Gray; Lalita Udpa; Feyzi Inanc; IOWA STATE UNIV AMES
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| A feasibility study was completed to evaluate a low cost, robust optical inspection method for detecting and characterizing fretting damage on metal suffaces. The effects of the quality and type of the light illumination and the angle of the illumination were measured. Dark field and light field imaging were used to generate images to measure the size of fretting areas. A signal dependence upon the depth of the surface roughness ... |
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| Fretting Fatigue Analysis and Palliatives |
JUN 1999 |
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| Authors:
Gary W. Kirkpatrick; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| The deleterious effects of fretting on the fatigue properties of a material have been known since the work of Warlow-Davies in 1941. However, a widely accepted fretting fatigue life prediction method still does not exist and debates persist as to what the critical parameter(s) for fretting fatigue are. This work demonstrates that the surface stresses due to contact can be used to characterize the damaging effects ... |
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| A Study of Fretting Fatigue in Aircraft Components |
14 OCT 1998 |
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| Authors:
Paul R. Birch; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
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| This thesis presents theoretical computational, and experimental approaches to the problem of fretting fatigue in materials systems relevant to aircraft components. The basic contact mechanics for fretting fatigue in a sphere-plane contact geometry are reviewed. Various elastic criteria for predicting fretting failure are discussed; selected fretting maps created from one of these the modified Crossland criterion are presented. Fail/no-fail predictions based on these maps have verified trends observed in experimental ... |
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| Fretting Corrosion in Airframe Riveted and Pinned Connections |
20 MAR 98 |
169 pages |
| Authors:
george t. hahn; Carol A. Rubin; VANDERBILT UNIV NASHVILLE TN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
|
| This year, URI-Initiation project examined the fretting and corrosion response of multiple rivet, one and two rivet-row, lap joints. Tribological parameters governing fretting as well as the effects of intereference and clamping on fretting wear and fretting fatigue have been evaluated using 2-D and 3-D finite element analyses. A piezoelectrically-driven fretting wear machine that can simulate the fretting conditions in connections has been constructed. In this ... |
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| The Role of Fretting Fatigue on Aircraft Rivet Hole Cracking |
OCT 96 |
80 pages |
| Authors:
David W. Heoppner; Charles D. Elliot III; Mark W. Moesser; UTAH UNIV SALT LAKE CITY DEPT OF MECHANICAL ENGINEERING
|
| This is the final report on the Federal Aviation Administration (FAA) Grant No. 93-G-068 Program conducted by the Quality and Integrity Design Engineering Center (QIDEC), Department of Mechanical Engineering, University of Utah. The program is entitled The Role of Fretting Corrosion and Fretting Fatigue on Aircraft Rivet Hole Cracking. A lap joint panel removed from an aircraft used in service was investigated for evidence of fretting induced cracking in and ... |
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| Literature Review and Preliminary Studies of Fretting and Fretting Fatigue Including Special Applications to Aircraft Joints |
APR 94 |
70 pages |
| Authors:
David Hoeppner; Saeed Adibnazari; Mark W. Moesser; UTAH UNIV SALT LAKE CITY DEPT OF MECHANICAL ENGINEERING
|
| This report contains a review of the literature pertinent to fretting and fretting fatigue including special applications to aircraft joints. An introduction is given outlining the importance of fretting and fretting fatigue failures. Proposed mechanisms Of fretting and fretting fatigue are then discussed. Research in the literature indicates there are three stages to fretting fatigue life. The first is a period of crack nucleation, usually by adhesion and plastic deformation ... |
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| The Effects of Thin Polymeric Surface Films in Reducing Fretting Corrosion and Wear |
30 OCT 87 |
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| Authors:
M. J. Furey; N. S. Eiss Jr.; H. H. Mabie; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
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| The subject of this investigation was the use of polymeric films to prevent fretting corrosion and wear. The friction and wear of the films was measured in an apparatus in which a ball was reciprocated on a flat. The measure of wear was the time required for the film to be worn through to the substrate. All of the polymers tested were thermoplastics or non-crosslinked elastomers. The following factors were ... |
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| Multitechnique Studies on Fretting Fatigue; Influence of Surface Treatment |
JAN 1984 |
|
| Authors:
H. Sander; BUNDESANSTALT FUER MATERIALPRUEFUNG BERLIN (GERMANY F R)
|
| The problem of fretting fatigue is becoming more acute as increasing demands are placed on materials. As the conditions of contacting surfaces are of great influence for the fretting fatigue process, a project has been initiated to investigate the influence of mechanical surface treatments on the fretting fatigue behaviour of steel specimens. One of the initial steps taken has been the development of an experimental apparatus and a test technique ... |
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| Mechanisms of Fretting Fatigue Crack Initiation in Medium Strength Steels |
01 SEP 1982 |
|
| Authors:
D. J. Duquette; RENSSELAER POLYTECHNIC INST TROY NY DEPT OF MATERIALS ENGINEERING
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| Effects of carburization and decarburization were studied on the fretting fatigue behavior of a medium carbon steel at room temperature. Tests were conducted in room air in a listing frame which was designed to vary the fretting (normal) load, and the relative displacement (slip amplitude) between the list specimens and fretting pads. Statistical studies conducted on the specimens indicated that after a threshold value of normal load, the fretting fatigue ... |
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| Stress Intensity Factors for Radial Cracks in a Partially Autofrettaged Thick-Wall Cylinder |
JUL 1981 |
|
| Authors:
s. L. Pu; M. a. Hussain; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB
|
| Using a finite element method and thermal simulation, stress intensity factors are determined for a uniform array of equal depth radial cracks emanating from the internal boundary of a pressurized, autofrettaged thick-wall cylinder. Computations of the stress intensity factors by methods of load relief and weight function are also examined. The combination of finite elements and weight functions is found very effective and is used in this report for multiple-radial ... |
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| Fretting Fatigue Inhibiting Method for Titanium. |
29 JUL 1980 |
|
| Authors:
Robert K. Betts; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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| A method for inhibiting the effects of fretting fatique in a pair of opposed titanium alloy mated surfaces through the use of a copper shim insert positioned between and in contact with the mated surfaces. (Author) |
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| Influence of Fretting on Flexural Fatigue of 304 Stainless Steel and Mild Steel |
APR 78 |
18 pages |
| Authors:
Robert C. Bill; Douglas A. Rohn; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER
|
| Fretting fatigue experiments conducted on 304 stainless steel using a flexural-fatigue test arrangement with bolted-on fretting pads have demonstrated that fatigue life is reduced by at least a factor of 10 in the 265- to 334-MPa (38,500- to 48,500-psi) nominal-flexural-fatigue-stress range. In addition, experiments in which the fretting pads were removed after selected numbers of cycles, followed by continued flexural fatigue without fretting show that continued fretting beyond 50,000 cycles ... |
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| Control of Fretting Fatigue. |
1977 |
97 pages |
| Authors:
NATIONAL MATERIALS ADVISORY BOARD (NAS-NAE) WASHINGTON D C
|
| The state of the art of fretting and available fretting-initiated fatigue tests are assessed. Recommendations focus on a program of research designed to improve understanding of fretting-initiated fatigue mechanisms and on aspects of evaluation. Guidelines for use by designers to circumvent the development of fretting also are described. An extensive review of the literature is included as is a 210-item bibliography. (Author) |
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| Fretting in Aircraft Systems. |
JAN 1975 |
|
| Authors:
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT PARIS (FRANCE)
|
| Fretting is becoming a recognized frequent source of major problems in the design, construction and operation of aircraft systems. High maintenance and inspection costs, increased down time, decreased durability and impaired safety are often direct results of damage or deterioration due to fretting, and catastrophic failures are not unheard of. The AGARD Specialists Meeting on the subject of fretting, held in Munich, Germany in October 1974, reviewed the state-of-the-art in ... |
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| An Investigation of the Fretting Fatigue Strength of BS L65 Aluminum Alloy Under Sinusoidal and Narrow Band Random Cyclic Stressing, |
JAN 1973 |
|
| Authors:
R. J. Ryman; A. J. Billingham; DEFENCE RESEARCH INFORMATION CENTRE ORPINGTON (ENGLAND)
|
| Investigation of the fretting fatigue strength of L.65 Aluminum Alloy and S.98 Steel Pads showed that considered on an RMS stress basis, the Random amplitude loading fretting fatigue strength was almost identical with the Sinusoidal constant amplitude fretting fatigue strength. The Sinusoidal fretting fatigue strength was found to be comparable with previous findings. The plain unfretted Random fatigue strength was found to be approximately 65% of the unfretted constant amplitude ... |
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| Friction and Wear Under Fretting Conditions of Materials for Use as Wire Friction Dampers of Compressor Blade Vibration |
JUL 1968 |
18 pages |
| Authors:
Max A. Swikert; Robert L. Johnson; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
|
| Friction dampers are required to reduce the magnitude of vibrational stresses in high-aspect-ratio blading of compressors for advanced aircraft turbine engines. Fret ting Is a common problem with all types of friction dampers. Fretting experiments with simulated wire-lace blade damping were conducted with Inconel 600. Experiments were run with or without oxide coatings In contact with maraging steel. Although two methods were used to form the oxide, high friction and ... |
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| EFFECT OF METAL HARDNESS AND SURFACE FINISH UPON FRETTING CORROSION |
28 MAY 1963 |
19 pages |
| Authors:
S. F. Calhoun; ROCK ISLAND ARSENAL IL
|
| The fretting damage to each of two different surface finishes on each of two degrees of hardness of test specimens of the same carbon steel was determined. Five greases of nearly identical composition and physical characteristics were used, thus conceivably nullifying any effect due to these grease properties. If the hardness of the specimens was the same, the smoother finish suffered the most fretting damage in all but one case. ... |
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Reports by Keyword(s)
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