Download or read book Influence of Residual Stresses on Fretting Fatigue Life Prediction in Ti 6Al 4V written by Patrick J. Golden and published by . This book was released on 2008 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 relatively little cold work. Testing showed these advanced surface treatments improved fretting fatigue strength by approximately 50 %. In addition to advanced surface treatments, several specimens were also coated with diamond-like carbon applied through a nonline-of-sight process capable of coating small dovetail slots in an engine disk. Testing with this coating alone and combined with advanced surface treatments also significantly improved fretting fatigue strength due to a decreased coefficient of friction along with the compressive residual stresses. This work presents a mechanics based lifing analysis of these tests that takes into account the local plasticity and the redistribution of residual stresses due to the contact loading. The use of superposition of the residual stresses into the contact stress analysis results in unconservative crack growth life predictions. Finite element analyses were conducted to predict the redistribution of residual stresses due to the contact loading. The redistributed residual stresses were used to make improved crack growth life predictions when possible. The results showed very little redistribution of residual stresses for the advanced surface treatments, however, a significant change in shot peened residual stress gradients was predicted.
Download or read book Dictionnaire portatif des arts et metiers contenant en abr g written by and published by . This book was released on 1767 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ICAF 2011 Structural Integrity Influence of Efficiency and Green Imperatives written by Jerzy Komorowski and published by Springer Science & Business Media. This book was released on 2011-05-06 with total page 950 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 26th Symposium of the International Committee on Aeronautical Fatigue are a widely referenced summary of advances in aeronautical design against fatigue. This is a bi-annual event and the proceedings have been published in book form for over 35 years.
Download or read book Residual Stress Effects in Fatigue written by J. F. Throop and published by ASTM International. This book was released on 1982 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fretting Fatigue Behavior of Ti 6Al 4V Against Ti 6Al 4V Under Flat on Flat Contact with Blending Radii written by T. Nicholas and published by . This book was released on 2000 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Mechanical and Microstructural Effects in Fretting Fatigue of Ti 6Al 4V written by Brett Page Conner and published by . This book was released on 2000-10-01 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fretting fatigue is the repetitive sliding of contacting surfaces at small displacements and can cause cracking that leads to failure in the presence of a bulk fatigue load. Dovetail joints in gas turbine engines are particularly susceptible to fretting fatigue and are the motivation for this study. Experiments are conducted in ambient air utilizing a sphere-on-flat contact geometry since its contact mechanics are well known. The effect of changing critical contact and bulk loading parameters are examined in depth for a mill annealed and solution treated overaged variants of Ti-6Al-4V. Parameters which are instrumented and controlled include the applied normal load, tangential load, and axial fatigue load. The fretting fatigue resistance of several other heat treated variants of Ti-6Al-4V are compared versus the two more common variants. Various stages of fretting fatigue crack growth are examined using a fracture mechanics approach. A multiaxial stress-based crack initiation criteria is developed and evaluated. The adhesion model of Giannakopoulos et al., is invoked to determine a contact fatigue threshold of 2 MPa square root of m for Ti-6Al-4V and forms the basis of a life-prediction methodology. Finally, the usefulness of various surface treatments and dovetail designs as palliatives to counter fretting fatigue is discussed.
Download or read book Standardization of Fretting Fatigue Test Methods and Equipment written by Mahmoud Helmi Attia and published by ASTM International. This book was released on 1992 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectrum Load Effects on the Fretting Behavior of Ti 6Al 4V written by SE. Kinyon and published by . This book was released on 2000 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Fretting Wear and Fretting Fatigue written by Tomasz Liskiewicz and published by Elsevier. This book was released on 2022-12-07 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Effects of Laser Peening on Fretting Fatigue of Ti 6Al 4V and Hydrogen Permeation of 316L Stainless Steel Coupons written by Kuo-Shu Liu and published by . This book was released on 2006 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fretting Fatigue written by David W. Hoeppner and published by ASTM International. This book was released on 2000 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume includes 36 of the 40 papers presented at the symposium, and a collection of six keynote papers providing background on the subject. Topics covered include parameter effects, environmental effects, crack nucleation, material and microstructural effects, damage analysis, fracture mechanic
Download or read book Engineering Applications of Residual Stress Volume 8 written by Tom Proulx and published by Springer Science & Business Media. This book was released on 2011-06-10 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering Applications of Residual Stress represents one of eight volumes of technical papers presented at the Society for Experimental Mechanics Annual Conference on Experimental and Applied Mechanics, held at Uncasville, Connecticut, June 13-16, 2011. The full set of proceedings also includes volumes on Dynamic Behavior of Materials, Mechanics of Biological Systems and Materials, Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials, MEMS and Nanotechnology; Optical Measurements, Modeling and, Metrology; Experimental and Applied Mechanics, and Thermomechanics and Infra-Red Imaging.
Download or read book Prediction of Fretting Fatigue Life written by Mihaela Buciumeanu and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fretting fatigue occurs at the interface between two contacting bodies that are pressed against each other in the presence of cyclic loads that gives rise to a small relative displacement. This research describes the fretting fatigue phenomena in a comparative way for three different materials (Al7175, Ck45 and Ti6Al4V). It consists in both experimental and analytical work. In order to develop a method that could be useful to estimate the fretting fatigue life, two strain based fatigue models have been chosen (Smith-Watson-Topper and Morrow models). These models were chosen because they are the models that include more intrinsic material properties being then more appropriate to understand either the influence of the material properties as well as to establish a comparison among different materials. It is expected that this work is of interest, as the knowledge of fretting fatigue is therefore essential for any engineer or technologist concerned with design/maintenance of the mechanical equipments, which almost always contains a large number of small amplitude sliding contacts.
Download or read book Proceedings of the 8th International Conference on Fracture Fatigue and Wear written by Magd Abdel Wahab and published by Springer Nature. This book was released on 2021-01-12 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings gather a selection of peer-reviewed papers presented at the 8th International Conference on Fracture Fatigue and Wear (FFW 2020), held as a virtual conference on 26–27 August 2020. The contributions, prepared by international scientists and engineers, cover the latest advances in and innovative applications of fracture mechanics, fatigue of materials, tribology, and wear of materials. In addition, they discuss industrial applications and cover theoretical and analytical methods, numerical simulations and experimental techniques. The book is intended for academics, including graduate students and researchers, as well as industrial practitioners working in the areas of fracture fatigue and wear.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contact Fatigue written by Brett Page Conner and published by . This book was released on 2002-08-01 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fretting fatigue is defined as damage resulting from small magnitude (0.5-50 microns) displacement between contacting bodies where at least one of the bodies has an applied bulk stress. The applicability and limits of a fracture mechanics based life prediction is explored. Comparisons are made against highly controlled experiments and less controlled but more realistic experiments using a novel dovetail attachment fixture. Surface engineering approaches are examined from a mechanics perspective. Using a new tool, depth sensing indentation, the mechanical properties of an aluminum bronze coating are determined. Fretting fatigue experiments are performed on specimens coated with aluminum bronze and on specimens treated with low plasticity burnishing. Low plasticity burnishing is a new method of introducing beneficial compressive residual stresses without significant cold work at the surface. A mechanics based approach to the selection of palliatives is addressed.
Download or read book Fretting Fatigue written by Steven E. Kinyon and published by ASTM International. This book was released on 2003 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains 29 contributions drawn from the Third International Symposium on Fretting Fatigue held in Nagaoka, Japan in May 2001. Sections of the volume address fretting wear and crack initiation; fretting fatigue crack and damage; life prediction; fretting fatigue parameter effects; loading condition
