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Mechanisms Of Corrosion Fatigue In High Strength I M Ingot Metallurgy And P M Powder Metallurgy Aluminum Alloys
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Book Synopsis Mechanisms of Corrosion Fatigue in High Strength I/M (Ingot Metallurgy) and P/M (Powder Metallurgy) Aluminum Alloys by : R. P. Wei
Download or read book Mechanisms of Corrosion Fatigue in High Strength I/M (Ingot Metallurgy) and P/M (Powder Metallurgy) Aluminum Alloys written by R. P. Wei and published by . This book was released on 1983 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: High strength aluminum alloys are employed extensively in the primary structure of current and projected Air Force and civilian aircraft. The service lives and reliability of these aircrafts depend to a great extent on the corrosion fatigue resistance of the structure alloys. Significant efforts are underway to develop powder metallurgy (P/M) alloys that would provide improved corrosion fatigue resistance along with improvements in other mechanical properties. The objective of this study is to understand the chemical and metallurgical aspects of environmental assisted fatigue crack growth (or corrosion fatigue) that can serve (1) as a basis for guiding the development of new and improved alloys, and (2) as a basis for developing rational design procedures for service life predictions. A coordinated fracture mechanics, surface chemistry and materials science approach is used. The research is being performed by Lehigh University with technical support by McDonnell Douglas Research Laboratories. (Author).
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue and Corrosion in Metals by : Pietro Paolo Milella
Download or read book Fatigue and Corrosion in Metals written by Pietro Paolo Milella and published by Springer Science & Business Media. This book was released on 2012-10-05 with total page 853 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook, suitable for students, researchers and engineers, gathers the experience of more than 20 years of teaching fracture mechanics, fatigue and corrosion to professional engineers and running experimental tests and verifications to solve practical problems in engineering applications. As such, it is a comprehensive blend of fundamental knowledge and technical tools to address the issues of fatigue and corrosion. The book initiates with a systematic description of fatigue from a phenomenological point of view, since the early signs of submicroscopic damage in few surface grains and continues describing, step by step, how these precursors develop to become mechanically small cracks and, eventually, macrocracks whose growth is governed by fracture mechanics. But fracture mechanics is also introduced to analyze stress corrosion and corrosion assisted fatigue in a rather advanced fashion. The author dedicates a particular attention to corrosion starting with an electrochemical treatment that mechanical engineers with a rather limited knowledge of electrochemistry will well digest without any pain. The electrochemical introduction is considered an essential requirement to the full understanding of corrosion that is essentially an electrochemical process. All stress corrosion aspects are treated, from the generalized film rupture-anodic dissolution process that is the base of any corrosion mechanism to the aggression occurring in either mechanically or thermally sensitized alloys up to the universe of hydrogen embrittlement, which is described in all its possible modes of appearance. Multiaxial fatigue and out-of-phase loading conditions are treated in a rather comprehensive manner together with damage progression and accumulation that are not linear processes. Load spectra are analyzed also in the frequency domain using the Fourier transform in a rather elegant fashion full of applications that are generally not considered at all in fatigue textbooks, yet they deserve a special place and attention. The issue of fatigue cannot be treated without a probabilistic approach unless the designer accepts the shame of one-out-of-two pieces failure. The reader is fully introduced to the most promising and advanced analytical tools that do not require a normal or lognormal distribution of the experimental data, which is the most common case in fatigue. But the probabilistic approach is also used to introduce the fundamental issue of process volume that is the base of any engineering application of fatigue, from the probability of failure to the notch effect, from the metallurgical variability and size effect to the load type effect. Fractography plays a fundamental role in the post mortem analysis of fatigue and corrosion failures since it can unveil the mystery encrypted in any failure.
Book Synopsis Corrosion-Fatigue Crack Propagation Rates in Commercial 7075 and P/M X7091 Aluminum Alloys by : M. Kumar
Download or read book Corrosion-Fatigue Crack Propagation Rates in Commercial 7075 and P/M X7091 Aluminum Alloys written by M. Kumar and published by . This book was released on 1983 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recently developed powder metallurgy (P/M) alloy X7091 (formerly CT91) has strength characteristics similar to ingot metallurgy (I/M) 7000 series alloys. However, its stress corrosion cracking resistance has been reported to be far superior to the conventional ingot-processed alloys. This suggests that P/M alloy X7091 may have far better corrosion fatigue behavior than I/M 7075-T651. Fatigue crack growth rates between 2.5 x 10-8 and 2.5 x 10-6 m/cycle (10-6 and 10-4 in./cycle) were measured for specimens in both the S-T and T-L orientations. In order to determine the effect of environment on the fatigue crack growth rates, tests were conducted in both an innocuous and an aggressive environment (R = 0.5; f = 0.2 Hz). Since it is known that the fatigue crack growth rates of aluminum alloys are sensitive to small amounts of water vapor, gaseous nitrogen with a dew point of -60°C (-75°F) was chosen as the innocuous environment. An aerated 31⁄2% NaCl solution was used as the corrosive environment.
Book Synopsis Environmental Corrosion-fatigue Behavior of Aluminum Alloys by : D. N. Williams
Download or read book Environmental Corrosion-fatigue Behavior of Aluminum Alloys written by D. N. Williams and published by . This book was released on 1970 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of environment on fatigue behavior are quite intimately related to such test variables as stress intensity, cyclic frequency, and temperature. The effect of these variables has been shown to be quite complex. However, a consistent pattern of behavior is beginning to emerge which, it is hoped, will lead to a considerably changed understanding of the corrosion-fatigue process. It is considered probable that an increased understanding of the corrosion-fatigue process will also contribute measureably to an improved understanding of general fatigue processes. Material variables such as composition, directionality of properties, and microstructure, have important effects on corrosion-fatigue behavior of aluminum alloys. However, it appears that these variables, at least in gaseous environments, may be important largely because of their effects on the mechanical behavior of aluminum alloys. On the other hand, studies in seawater suggest that these variables become increasingly important as the corrosive nature of the environment increases. This memorandum discusses in detail the effects of both test variables and material variables on corrosion fatigue. In addition, current theories of corrosion-fatigue mechanisms are outlined, and several methods of preventing corrosion fatigue are suggested. (Author).
Book Synopsis A Fundamental Study of Fatigue in Powder Metallurgy Aluminum Alloys by : A. Lawley
Download or read book A Fundamental Study of Fatigue in Powder Metallurgy Aluminum Alloys written by A. Lawley and published by . This book was released on 1981 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Processing-microstructure-fatigue relationships have been examined in high-strength powder metallurgy aluminum alloys (Al-Cu, Mg, Zn, Co) in air and salt fog. Three phases were included: (i) The combined effects of cobalt level and processing mode on fatigue life and resistance to crack propagation; (ii) The role of plane-strain forging on fatigue life and crack propagation response; (iii) The combined effects of cobalt level and processing mode on strain-controlled low-cycle fatigue. While the interplay between processing history, alloy composition and orientation is complex, a basic understanding of the role of microstructure on the crack initiation and propagation stages of fatigue has been obtained. Direct comparisons of the corresponding fatigue response of counterpart ingot metallurgy alloys were included. In general, the P/M processed material exhibits superior resistance to fatigue crack initiation compared to the I/M form. However the relative crack growth rates in the P/M and to the I/M form. However the relative crack growth rates in the P/M and I/M materials depend on orientation and the level of delta K. (Author).
Download or read book Metals Abstracts written by and published by . This book was released on 1992 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue and Corrosion in Metals by : Vivek Tiwari
Download or read book Fatigue and Corrosion in Metals written by Vivek Tiwari and published by Scitus Academics LLC. This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion fatigue is fatigue in a corrosive environment. It is the mechanical degradation of a material under the joint action of corrosion and cyclic loading. Nearly all engineering structures experience some form of alternating stress, and are exposed to harmful environments during their service life. The environment plays a significant role in the fatigue of high-strength structural materials like steel, aluminum alloys and titanium alloys. Materials with high specific strength are being developed to meet the requirements of advancing technology. However, their usefulness depends to a large extent on the extent to which they resist corrosion fatigue. The effects of corrosive environments on the fatigue behavior of metals were studied as early as 1930. The phenomenon should not be confused with stress corrosion cracking, where corrosion (such as pitting) leads to the development of brittle cracks, growth and failure. The only requirement for corrosion fatigue is that the sample be under tensile stress.
Book Synopsis The International Journal of Powder Metallurgy & Powder Technology by :
Download or read book The International Journal of Powder Metallurgy & Powder Technology written by and published by . This book was released on 1981 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanisms of Corrosion Fatigue Crack Growth in High Strength Aluminum Alloys by : Jacques P. Robert
Download or read book Mechanisms of Corrosion Fatigue Crack Growth in High Strength Aluminum Alloys written by Jacques P. Robert and published by . This book was released on 1981 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Fatigue of Powder Metallurgy Alloys by : A. J. McEvily
Download or read book The Fatigue of Powder Metallurgy Alloys written by A. J. McEvily and published by . This book was released on 1985 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the important conditions in qualifying high strength powder metallurgy alloys is their resistance to fatigue crack propagation. The results of the present investigation indicate that the fatigue crack propagation resistance of high strength P/M aluminum alloys is equivalent to that of a comparable ingot metallurgy alloy in the near-threshold region. The ingot alloy exhibits a slightly lower crack growth rate in the intermediate region. However the higher strength of the P/M alloys (550 MPa YS, 600 MPa UTS) as compared to the ingot alloy (450 MPa, 550 MPa) results in a reduction of fracture toughness with the result that the crack growth rates at high (Delta) k levels are higher in the P/M alloys. If exactly equivalent tensile properties were present in both P/M and I/M materials perhaps this difference would not occur since nothing characterizable as a defect was found in the P/M alloys. A procedure for the analysis of the growth of short cracks from notches based upon crack closure considerations has also been formulated. Short crack behavior is important in establishing inspection intervals in retirement for cause applications, for example. The rate and extent at which crack closure develops in the wake of a newly formed crack can be used not only in the treatment of short crack behavior, but also to account for the notch size effect in fatigue as well as for fatigue notch sensitivity.
Book Synopsis Stress-corrosion Cracking of Aluminum Alloys by : F. H. Haynie
Download or read book Stress-corrosion Cracking of Aluminum Alloys written by F. H. Haynie and published by . This book was released on 1966 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report deals with the stress-corrosion cracking of aluminum alloys, and it represents an effort by DMIC to expand on the information contained in DMIC Memorandum 202, 'Stress-Corrosion Cracking of Aluminum Alloys', dated February 15, 1965. DMIC Report 228 begins by presenting a comprehensive definition of stress-corrosion cracking. This is followed by sections dealing with (1) the historical development and growth in awareness of the problem, (2) the mechanisms involved, and (3) the theory of stress-corrosion cracking. A section on experimental techniques is presented. These techniques include test methods used to determine the susceptibility of alloys to stress-corrosion cracking, as well as more refined methods of studying the fundamental mechanisms of the problem. Different evaluation methods, applicable to obtaining the different objectives of stress-corrosion testing, are also presented. All of the foregoing serve as background to the sections on stress-corrosion-cracking behavior of aluminum alloys and preventive measures. (Author).
Book Synopsis High-strength Powder Metallurgy Aluminum Alloys by : Michael J. Koczak
Download or read book High-strength Powder Metallurgy Aluminum Alloys written by Michael J. Koczak and published by . This book was released on 1982 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Techniques for Assessing the Corrosion Properties of Aluminum Powder Metallurgy Alloys by : Pickens, JR.
Download or read book Techniques for Assessing the Corrosion Properties of Aluminum Powder Metallurgy Alloys written by Pickens, JR. and published by . This book was released on 1986 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: The test techniques that have been used to assess the corrosion behavior of aluminum powder metallurgy (PM) alloys are described. Standard ASTM tests have been used to measure general and pitting corrosion, exfoliation corrosion, and stress-corrosion cracking (SCC) susceptibilities of these alloys. However, the drive to measure subtle but important improvements in SCC behavior at higher strength levels and the desire to understand the complex SCC mechanisms in aluminum PM alloys have led to the use of extremely innovative test techniques. These techniques--the slow strain rate, loading mode, breaking load, bolt-loaded double cantilever beam, and shadow-optical-caustic tests--are described. Examples are presented comparing the susceptibilities of PM alloys to the various types of corrosion with the susceptibilities of conventional ingot alloys.
Book Synopsis Corrosion Fatigue by : T. W. Crooker
Download or read book Corrosion Fatigue written by T. W. Crooker and published by ASTM International. This book was released on 1983 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanisms of Corrosion Fatigue Propagation in a High Strength Aluminum Alloy by : Ronald Elliott Stoltz
Download or read book Mechanisms of Corrosion Fatigue Propagation in a High Strength Aluminum Alloy written by Ronald Elliott Stoltz and published by . This book was released on 1971 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Corrosion-Fatigue Technology by : H. Lee Craig
Download or read book Corrosion-Fatigue Technology written by H. Lee Craig and published by ASTM International. This book was released on 1978 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
