Effect of a Variable Contact Load on Fretting Fatigue Behavior of Ti- 6Al-4V PDF Download
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Author: Andrew J. Jutte
Publisher:
ISBN: 9781423516101
Category : Fretting corrosion
Languages : en
Pages : 174
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Book Description
Effects of a variable contact load on the high cycle fretting fatigue behavior of Ti-6AL-4V were investigated. Experimental tests were performed using a new test setup capable of applying a contact load varying in amplitude, frequency, and phase and independently measuring shear forces on opposite sides of a specimen. Finite element analysis (FEA) of experimental and idealized loading conditions was performed and local mechanistic parameters and the Modified Shear Stress Range (MSSR) fatigue parameter were determined. Correlations between contact width, slip amplitude, fatigue life and a variable contact load were established with variable contact loading shown to have a damaging effect. Predicted values of crack location and orientation using the MSSR parameter were verified experimentally. The MSSR parameter unsuccessfully predicted fatigue life for variable contact loads. A new formulation of the MSSR parameter is proposed.
Author: Andrew J. Jutte
Publisher:
ISBN: 9781423516101
Category : Fretting corrosion
Languages : en
Pages : 174
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Book Description
Effects of a variable contact load on the high cycle fretting fatigue behavior of Ti-6AL-4V were investigated. Experimental tests were performed using a new test setup capable of applying a contact load varying in amplitude, frequency, and phase and independently measuring shear forces on opposite sides of a specimen. Finite element analysis (FEA) of experimental and idealized loading conditions was performed and local mechanistic parameters and the Modified Shear Stress Range (MSSR) fatigue parameter were determined. Correlations between contact width, slip amplitude, fatigue life and a variable contact load were established with variable contact loading shown to have a damaging effect. Predicted values of crack location and orientation using the MSSR parameter were verified experimentally. The MSSR parameter unsuccessfully predicted fatigue life for variable contact loads. A new formulation of the MSSR parameter is proposed.
Author: Chia-hwa Lee
Publisher:
ISBN: 9781423522126
Category : Fretting corrosion
Languages : en
Pages : 230
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Book Description
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 under constant and variable contact load configurations using both shot-peened and un-peened specimens made up of Ti-6Al-4V alloy. Contact loads were applied with four different frequencies Applied axial loads were also manipulated to produce tension-tension and tension-compression test conditions on the specimens at the frequency of 10 Hz. Cracks were always found to initiate near the trailing edge for all tests. The crack initiated on the contact surface of un-peened specimens and within the interior of shot-peened specimens. Finite element analysis was performed by a commercially available software, ABAQUS, to obtain contact region state variables such as stress, strain, and displacement which were computed for the development of fretting fatigue parameters. Fatigue parameters, such as the stress range, effective stress, and modified shear stress range (MSSR), were analyzed for their applicability on fretting fatigue life prediction. No strong correlation between contact load conditions and fretting fatigue mechanisms was found, and shot-peening improved fretting fatigue life despite contact load conditions. Also, the MSSR parameter was effective in fretting fatigue predictions under constant and variable contact load conditions in terms of fatigue life, crack initiation location and orientation.
Author: Mohammad Almajali
Publisher:
ISBN:
Category : Axial loads
Languages : en
Pages : 292
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Book Description
Author: Abdulla Al-Noaimi
Publisher:
ISBN:
Category : Axial loads
Languages : en
Pages : 276
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Book Description
Author: Orly Leiva
Publisher:
ISBN:
Category : Fretting corrosion
Languages : en
Pages : 294
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Book Description
Author: T. Nicholas
Publisher:
ISBN:
Category : Contact mechanics
Languages : en
Pages : 14
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Book Description
A study was conducted to evaluate fretting fatigue damage of Ti-6Al-4V under flat-on-flat contact at room temperature. Results were obtained to establish the fatigue limit of the material. Axial stresses necessary to fail specimens at 107 cycles for different contact radii, applied normal stresses, and stress ratios were evaluated to determine the baseline fretting fatigue behavior. Then, the effect of fretting fatigue on specimen life was quantified by conducting interrupted fretting tests for various load ratios and normal stresses followed by residual strength uniaxial fatigue tests. Fractography was used to characterize the nature of fretting damage. Results indicate that no degradation in fatigue limit is observed when the material is subjected to up to 10 percent of fretting fatigue life.
Author: Tomasz Liskiewicz
Publisher: Elsevier
ISBN: 0128240970
Category : Technology & Engineering
Languages : en
Pages : 656
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Book Description
Fretting Wear and Fretting Fatigue: Fundamental Principles and Applications takes a combined mechanics and materials approach, providing readers with a fundamental understanding of fretting phenomena, related modeling and experimentation techniques, methods for mitigation, and robust examples of practical applications across an array of engineering disciplines. Sections cover the underpinning theories of fretting wear and fretting fatigue, delve into experimentation and modeling methods, and cover a broad array of applications of fretting fatigue and fretting wear, looking at its impacts in medical implants, suspension ropes, bearings, heating exchangers, electrical connectors, and more. Covers theoretical fundamentals, modeling and experimentation techniques, and applications of fretting wear and fatigue Takes a combined mechanics and materials approach Discusses the differences and similarities between fretting wear and fretting fatigue as well as combined experimental and modeling methods Covers applications including medical implants, heat exchangers, bearings, automotive components, gas turbines, and more
Author: SE. Kinyon
Publisher:
ISBN:
Category : Contact mechanics
Languages : en
Pages : 16
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Book Description
An investigation was performed to determine the effects of spectrum loading on the fretting fatigue life of titanium alloy Ti-6Al-4V. The research program consisted of a 10 Hz spectrum load cycle applied at six conditions of interest with a normal pressure of 31 MPa. Baseline tests were performed at three stress levels, 345, 310, and 286 MPa maximum load using a conventional haversine waveform. Tests were performed using a spectrum load waveform consisting of 2 cycles, one at 345 MPa, followed by another at 310 MPa, repeated to failure. Additional tests were performed using 345 and 286 MPa. The final condition of interest was investigated using a 345/310/286 MPa waveform. Miners rale was applied to each of the spectrum load cases to test the hypothesis that the titanium alloy followed Miners Rule under the loading conditions. The three conditions of interest varied from Miners Rule by 23, 47, and 62%. From these results it was concluded that Miners Rule was insufficient to predict failure lives of Ti-6Al-4V in fretting fatigue.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Rihong Wang
Publisher:
ISBN:
Category : Fretting corrosion
Languages : en
Pages : 306
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Book Description
