Download or read book High Cycle Fatigue Thresholds in a Turbine Engine Titanium Alloy written by Brad Lee Boyce and published by . This book was released on 1998 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Microstructure on High Cycle Fatigue Thresholds in a Turbine Engine Titanium Alloy written by Ravi Kiran Nalla and published by . This book was released on 2001 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Cycle Fatigue written by Theodore Nicholas and published by Elsevier. This book was released on 2006-07-07 with total page 657 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dr Theodore Nicholas ran the High Cycle Fatigue Program for the US Air Force between 1995 and 2003 at Wright-Patterson Air Force Base, and is one of the world's leading authorities on the subject, having authored over 250 papers in leading archival journals and books. Bringing his plethora of expertise to this book, Dr Nicholas discusses the subject of high cycle fatigue (HCF) from an engineering viewpoint in response to a series of HCF failures in the USAF and the concurrent realization that HCF failures in general were taking place universally in both civilian and military engines. Topic covered include: - Constant life diagrams - Fatigue limits under combined LCF and HCF - Notch fatigue under HCF conditions - Foreign object damage (FOD) - Brings years of the Author's US Air Force experience in high cycle fatigue together in one text - Discusses HCF in the context of recent international military and civilian engine failures
Download or read book Fatique and Fracture Mechanics written by Gary R. Halford and published by ASTM International. This book was released on 2000 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Advances in High Cycle Fatigue written by Ted Nicholas and published by . This book was released on 2003 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: High cycle fatigue (HCF) has been the cause of a number of turbine engine failures over the last several years within the U.S. Air Force. Extensive investigations have determined that the root cause when related to material properties, is the accumulation of damage prior to and during service which, in turn, reduces the capability of the material in terms of the fatigue limit strength. Numerous studies have been conducted over the past several years to address the determination of fatigue limits. In this paper, in addition to developing approaches for predicting fatigue limits under various mean stresses and biaxial stress states, methods are presented for accounting for service-induced damage. One of the types of damage involves low cycle fatigue (LCF) which, by itself, should not cause failure but may reduce the HCF capability of the material. Data on the accumulation of damage under LCF or HCF overload transients, and their effects on the HCF strength of a titanium alloy are used to illustrate the inability of linear damage summation laws. A Kitagawa diagram with a short crack correction is found to be useful in assessing the fatigue strength of both smooth and notched specimens.
Download or read book Threshold Fatigue Crack Growth Behavior written by F. K. Haake and published by . This book was released on 1989 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Cycle Fatigue Investigation of Titanium 6A1 4V Alloy written by and published by . This book was released on 1968 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: To evaluate the effect of forging and heat treatment parameters on titanium 6A1-4V alloy (AMS 4928), various microstructures were investigated and compared in a deflection-controlled low cycle fatigue test program. The test specimen was designed to simulate the strain state observed in gas turbine engine components. The results of this study will be used to optimize the design of compressor disks. Parameters investigated include environment, mean strain, and surface condition. The number of cycles to initiate a fatigue crack and the rate of crack propagation were measured to evaluate the microstructures. The number of cycles to crack initiation was correlated with a mechanistic theory based on the static properties of the materials investigated.
Download or read book Fatigue and Crack growth Behavior in a Titanium Alloy Under Constant amplitude and Spectrum Loading written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A titanium alloy (Ti-6Al-4V STOA) plate material was provided by the University of Dayton Research Institute from a previous U.S. Air Force high-cycle fatigue study. Fatigue-crack-growth tests on compact, C(T), specimens have been previously performed at Mississippi State University on the same material over a wide range in rates from threshold to near fracture for several load ratios (R = Pmin/Pmax). These tests used the compression pre-cracking method to generate fatigue-crack-growth-rate data in the near-threshold regime. Current load-reduction procedures were found to give elevated thresholds compared to compression pre-cracking methods. A crack-closure model was then used to determine crack-front constraint and a plasticity-corrected effective stress-intensity-factor-range relation over a wide range in rates and load ratios. Some engineering estimates were made for extremely slow rates (small-crack behavior), below the commonly defined threshold rate. Single-edge-notch-bend, SEN(B), fatigue specimens were machined from titanium alloy plates and were fatigue tested at two constant-amplitude load ratios (R = 0.1 and 0.5) and a modified Cold-Turbistan engine spectrum. Calculated fatigue lives from FASTRAN, a fatigue-life-prediction code, using small-crack theory with an equivalent-initial-flaw-size (semi-circular surface flaw) of 9 æm in radius at the center of the semi-circular edge notch fit the constant-amplitude test data fairly well, but underpredicted the spectrum loading results by about a factor of 2 to 3. Life predictions made with linear-cumulative damage (LCD) calculations agreed fairly well with the spectrum tests.
Download or read book Titanium Damage Tolerant Design Data for Propulsion Systems written by and published by . This book was released on 1977 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The program consisted of crack growth threshold, crack growth rate, and fracture toughness testing for each alloy plus strain controlled low cycle fatigue crack initiation testing on Ti 8-1-1. The effects of stress ratio, cyclic frequency, and temperature were determined, providing a broad data base for damage tolerant design of titanium gas turbine engine components.
Download or read book Small Fatigue Cracks written by K.S. Ravichandran and published by Elsevier. This book was released on 1999-09-30 with total page 511 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the fully peer-reviewed papers presented at the Third Engineering Foundation Conference on Small Fatigue Cracks, held under the chairmanship of K.S. Ravichandran and Y. Murakami during December 6-11, 1998, at the Turtle Bay Hilton, Oahu, Hawaii. This book presents a state-of-the-art description of the mechanics, mechanisms and applications of small fatigue cracks by most of the world's leading experts in this field. Topics ranging from the mechanisms of crack initiation, small crack behavior in metallic, intermetallic, ceramic and composite materials, experimental measurement, mechanistic and theoretical models, to the role of small cracks in fretting fatigue and the application of small crack results to the aging aircraft and high-cycle fatigue problems, are covered.
Download or read book Crack Growth in Titanium Alloys Under the Conjoint Action of High and Low Cycle Fatigue written by and published by . This book was released on 1986 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue crack propagation rates have been measured for two titanium-based aeroengine disc alloys using compact tension test pieces. The loading block employed simulates two features of the engine flight pattern. A major stress cycle represents the start-stop operation which leads to low cycle fatigue. In-flight vibrations, which may give rise to high cycle fatigue, are represented by superimposed minor cycles of high frequency. With a lifting policy of retirement for cause the useful lives of blades and discs are limited by the onset of minor cycle crack growth. The threshold values associated with the minor cycles have been used to predict this event. Similarly the method of linear summation has been used to predict the subsequent fatigue crack growth rates. These predictions are successful for Ti-6A1-4V, whilst for Ti-5331S they are found to be either accurate or safe. Although Ti-5331S displays a marginally greater resistance to the onset of minor cycle crack growth, of greater significance is its reduced crack growth rates prior to this event. As a consequence components fabricated from Ti-5331S will exhibit longer fatigue crack propagation lives when subjected to the conjoint action of high and low cycle fatigue.
Download or read book Gigacycle Fatigue of the Titanium Alloy written by Alexander Nikitin and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This PhD project is dealing with a problem of fatigue failures of aeronautical titanium alloy due to high frequency loading. The material for investigation was taken from the real aircraft engine compressor disk. Ultrasonic fatigue tests were carried out up to outrun limit of 1010 cycles. This region of lifetime is known as Gigacycle or very high cycle fatigue. This PhD project shows for the first time the results of fatigue tests on the VT3-1 aeronautical titanium alloy in the Gigacycle region. The fatigue properties of the titanium alloy were determined at 109 cycles for different loading conditions: tension-compression, tension-tension and torsion loading. Typical crack initiation mechanisms were identified and critical defects of microstructure were found. The effect of anisotropy due to fabrication process on the fatigue properties of the forged VT3-1 titanium alloy was studied. An influence of technological process on fatigue properties was also studied by comparison the results on extruded and forged VT3-1 titanium alloy.The new ultrasonic torsion machine was designed and installed for the long life (up to 1010 cycles) fatigue tests under rotation. The first results under ultrasonic torsion loading were obtained for the titanium alloy made by extrusion and forged technologies.
Download or read book Power Transmissions written by Datong Qin and published by CRC Press. This book was released on 2016-11-10 with total page 1081 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents papers from the International Conference on Power Transmissions 2016, held in Chongqing, China, 27th-30th October 2016. The main objective of this conference is to provide a forum for the most recent advances, addressing the challenges in modern mechanical transmissions. The conference proceedings address all aspects of gear and power transmission technology and a range of applications. The presented papers are catalogued into three main tracks, including design, simulation and testing, materials and manufacturing, and industrial applications. The design, simulation and testing track covers topics such as new methods and designs for all types of transmissions, modelling and simulation of power transmissions, strength, fatigue, dynamics and reliability of power transmissions, lubrication and sealing technologies and theories, and fault diagnosis of power transmissions. In the materials and manufacturing track, topics include new materials and heat treatment of power transmissions, new manufacturing technologies of power transmissions, improved tools to predict future demands on production systems, new technologies for ecologically sustainable productions and those which preserve natural resources, and measuring technologies of power transmissions. The proceedings also cover the novel industrial applications of power transmissions in marine, aerospace and railway contexts, wind turbines, the automotive industry, construction machinery, and robots.
Download or read book Fatigue Crack Propagation in Titanium Alloys written by A. J. McEvily and published by . This book was released on 1975 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report summarizes the research accomplishments in the first year's program of a study of fatigue crack growth in Ti-6Al-4V alloys. Fatigue crack growth rates have been determined in the mean threshold regions, and data for the effect of mean stress on the threshold level indicate that the dependency may be interpretable in terms of a constrant crack opening criterion. Additional work on high cycle fatigue indicates that there are two regions for the Coffin-Manson relation and that cyclically developed residual stresses may be responsible for this behavior.
Download or read book Understanding Impact induced Fatigue Failure written by Brad Lee Boyce and published by . This book was released on 2001 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ICAF 2009 Bridging the Gap between Theory and Operational Practice written by M. Bos and published by Springer Science & Business Media. This book was released on 2009-05-24 with total page 1340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 31st Conference and the 25th Symposium of the International Committee on Aeronautical Fatigue will be hosted in Rotterdam, The Netherlands, by the National Aerospace Laboratory NLR, under the auspices of the Netherlands Association of Aeronautical Engineers NVvL, the Technical University of Delft and Stork Fokker AESP B.V. These Proceedings will consist of reviews of aeronautical fatigue activities presented by the national delegates of the 14 member nations of ICAF. It will also contain specialist papers presented by international authors with design, manufacturing, airworthiness regulations, operations and research backgrounds. The papers will be based on the theme “Bridging the gap between theory and operational practice”.
Download or read book Analysis and Design Issues for Modern Aerospace Vehicles 1997 written by George J. Simitses and published by . This book was released on 1997 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title compiles the 47 papers from the four separate symposia on structural similitude and size effects, thermo mechanical interaction in structures and materials, sandwich structures, and structural and aero-mechanical research in high-cycle fatigue.
