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Effect Of Roughness And Residual Compression Stresses On The Ultrasonic Fatigue Endurance Of Aluminum Alloy Aisi 6061 T6
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Book Synopsis Effect of Roughness and Residual Compression Stresses on the Ultrasonic Fatigue Endurance of Aluminum Alloy AISI 6061-T6 by : Gonzalo Dominguez Almaraz
Download or read book Effect of Roughness and Residual Compression Stresses on the Ultrasonic Fatigue Endurance of Aluminum Alloy AISI 6061-T6 written by Gonzalo Dominguez Almaraz and published by . This book was released on 2015 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasonic fatigue tests were carried out on the aluminum alloy AISI 6061-T6, presenting different values for the principal surface roughness parameters: Ra, Rq, and Rz. For fatigue life comprised between 3 x 105 ~ 6 x 106 cycles, crack initiates at the specimen surface induced by stress-concentration and micro-plastic deformation (micro-void coalescence); whereas for the very high cycle fatigue (>107 cycles), the mechanism of crack initiation moves to subsurface or inside the specimen and is associated with internal imperfections such as micro-porosities or nonmetallic inclusions. For the first fatigue life regime, compression residual stresses induced by the work-hardening machining process and the associated micro-plastic deformation are the principal factors controlling the fatigue endurance on this aluminum alloy. Experimental results show that fatigue endurance is higher for the high surface roughness in the 3 x 105 ~ 6 x 106 cycles of fatigue life, whereas this behavior is inversed in the very high-cycle fatigue regime. These results are analyzed in terms of residual compression stresses induced by the work-hardening machining process, the surface roughness, and the reverse yielding or Bauschinger effect.
Book Synopsis Effects of Changing Stress Amplitude on the Rate of Fatigue-crack Propagation in Two Aluminum Alloys by : C. M. Hudson
Download or read book Effects of Changing Stress Amplitude on the Rate of Fatigue-crack Propagation in Two Aluminum Alloys written by C. M. Hudson and published by . This book was released on 1961 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of fatigue tests with specimens subjected to constant amplitude and two-step axial loads were conducted on 12-inch-wide sheet specimens of 2024-T3 and 7075-T6 aluminum alloy to study the effects of a change in stress level on fatigue-crack propagation. Comparison of the results of the tests in which the specimens were tested at first a high and then a low stress level with those of the constant-stress-amplitude tests indicated that crack propagation was generally delayed after the transition to the lower stress level. In the tests in which the specimens were tested at first a low and then a high stress level, crack propagation continued at the expected rate after the change in stress levels.
Book Synopsis Experiments in Fatigue Under Ranges of Stress in Torsion and Axial Load from Tension to Extreme Compression by : William Nichols Findley
Download or read book Experiments in Fatigue Under Ranges of Stress in Torsion and Axial Load from Tension to Extreme Compression written by William Nichols Findley and published by . This book was released on 1954 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Static Prestrain on the Prot-fatigue Properties of Unnotched and Notched Materials at Room Ane Elevated Temperatures by : F. H. Vitovec
Download or read book Effect of Static Prestrain on the Prot-fatigue Properties of Unnotched and Notched Materials at Room Ane Elevated Temperatures written by F. H. Vitovec and published by . This book was released on 1958 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influence of Precorrosion on Fatigue Properties of Shot-Peened Aluminium 7075-T651 by : U. Zupanc
Download or read book Influence of Precorrosion on Fatigue Properties of Shot-Peened Aluminium 7075-T651 written by U. Zupanc and published by . This book was released on 2011 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pitting corrosion has a major influence on aging of structural elements made of high-strength aluminium alloys as corrosion pits lead to much earlier fatigue crack initiation under tensile dynamic loading. In order to improve material resistance to corrosion fatigue, it is necessary to reduce pit-tip stresses in the corroded pits areas. Shot peening (SP) is an important and well-known cold working process, having been used in industrial applications for a long time. Shot peening as intense plastic deformation in the thin surface layer affects cold surface hardening by primary inducing favorable residual compressive stresses. It is used in order to increase fatigue strength in operation and to improve fatigue resistance of precorroded material. The paper deals with the surface integrity of shot-peened high-strength 7075-T651 aluminium alloy. The paper describes the effects of SP treatment by presenting analyses of surface roughness measurement, residual stresses, material bending fatigue resistance, fractographic analysis of fatigued specimens, and electrochemical potentiodynamic testing.
Book Synopsis Variable-amplitude Fatigue Tests with Particular Attention to the Effects of High and Low Loads by : Eugene C. Naumann
Download or read book Variable-amplitude Fatigue Tests with Particular Attention to the Effects of High and Low Loads written by Eugene C. Naumann and published by . This book was released on 1962 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Stress Ratio on Fatigue Fractographic Features in 6061-T6 Aluminum Alloy by : Kudithipudi Narayana Rao
Download or read book The Effect of Stress Ratio on Fatigue Fractographic Features in 6061-T6 Aluminum Alloy written by Kudithipudi Narayana Rao and published by . This book was released on 1982 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Effect of Residual Stresses on Fatigue Crack Growth Rates in Weldments of Aluminum Alloy 5456 Plate by : RA. Kelsey
Download or read book Effect of Residual Stresses on Fatigue Crack Growth Rates in Weldments of Aluminum Alloy 5456 Plate written by RA. Kelsey and published by . This book was released on 1982 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rates of fatigue crack propagation were determined for CT specimens taken from the weld metal, heat-affected zone, and base metal of an Alcoa 649A Process 5556 butt weld in a 51-mm (2-in.)-thick 5456-H117 plate. Crack-opening displacement measurements were taken during the fatigue crack propagation tests so that the effects of crack-opening loads and residual stresses could be determined. The use of the concept of Elber's effective stress intensity range, based on the measurements of crack-opening loads, indicates that the crack propagation rates are equivalent in the weld metal, heat-affected zone, and base metal. Furthermore, the effect of stress ratio also can be correlated using the effective stress intensity range concept.
Download or read book Fatigue Design written by Eliahu Zahavi and published by CRC Press. This book was released on 2019-01-22 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern analytical theories of fatigue coupled with a knowledge of processing effects on metals make up the sound basis for designing machine parts that are free from unexpected failure. Fatigue Design: Life Expectancy of Machine Parts provides the information and the tools needed for optimal design. It highlights practical approaches for effectively solving fatigue problems, including minimizing the risk of hidden perils that may arise during production processes or from exposure to the environment.The material is presented with a dual approach: the excellent coverage of the theoretical aspects is accented by practical illustrations of the behavior of machine parts. The theoretical approach combines the fundamentals of solid mechanics, fatigue analysis, and crack propagation. The chapters covering fatigue theories are given special emphasis, starting with the basics and progressing to complicated multiaxial nonlinear problems.The practical approach concentrates on the effects of surface processing on fatigue life and it illustrates many faceted fatigue problems taken from case studies. The solutions demonstrate the authors' detailed analyses of failure and are intended to be used as preventive guidelines. The cases are a unique feature of the book. The numerical method used is the finite element method, and is presented with clear explanations and illustrations.Fatigue Design: Life Expectancy of Machine Parts is an extremely valuable tool for both practicing design engineers and engineering students.
Book Synopsis Ultrasonic Fatigue by : Joseph M. Wells
Download or read book Ultrasonic Fatigue written by Joseph M. Wells and published by . This book was released on 1982 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721666027 Total Pages :30 pages Book Rating :4.6/5 (66 download)
Book Synopsis The Effect of Hole Quality on the Fatigue Life of 2024-T3 Aluminum Alloy Sheet by : National Aeronautics and Space Administration (NASA)
Download or read book The Effect of Hole Quality on the Fatigue Life of 2024-T3 Aluminum Alloy Sheet written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-21 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents the results of a study whose main objective was to determine which type of fabrication process would least affect the fatigue life of an open-hole structural detail. Since the open-hole detail is often the fundamental building block for determining the stress concentration of built-up structural parts, it is important to understand any factor that can affect the fatigue life of an open hole. A test program of constant-amplitude fatigue tests was conducted on five different sets of test specimens each made using a different hole fabrication process. Three of the sets used different mechanical drilling procedures while a fourth and fifth set were mechanically drilled and then chemically polished. Two sets of specimens were also tested under spectrum loading to aid in understanding the effects of residual compressive stresses on fatigue life. Three conclusions were made from this study. One, the residual compressive stresses caused by the hole-drilling process increased the fatigue life by two to three times over specimens that were chemically polished after the holes were drilled. Second, the chemical polishing process does not appear to adversely affect the fatigue life. Third, the chemical polishing process will produce a stress-state adjacent to the hole that has insignificant machining residual stresses. Everett, Richard A., Jr. Langley Research Center NASA/TM-2004-212658, L-19011, ARL-TR-3106
Book Synopsis Evaluation of the Influence of Load Randomization and of Ground-air-ground Cycles on Fatigue Life by : Eugene C. Naumann
Download or read book Evaluation of the Influence of Load Randomization and of Ground-air-ground Cycles on Fatigue Life written by Eugene C. Naumann and published by . This book was released on 1964 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of the Intermediate Principal Stress on Triaxial Fatigue of 7075-T6 Aluminum Alloy by : William Nichols Findley
Download or read book The Effect of the Intermediate Principal Stress on Triaxial Fatigue of 7075-T6 Aluminum Alloy written by William Nichols Findley and published by . This book was released on 1972 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue tests of 7075-T6 aluminum alloy under synchronous pulsating triaxial stresses were performed with three different values of the intermediate principal stress. Thick-walled tubes were subjected to internal pressure pulse axial stress such that the state of stress at the inner surface was as follows: in the first case the intermediate principal stress was a compression equal to the internal pressure; in the second it was a tension equal to the internal pressure; and in the third it was a tension equal to the hoop stress at the inner surface. Results showed no effect of the intermediate principal stress. (Author).
Book Synopsis Surface Residual Stresses in Shot Peened 6061-T6 Aluminum and Their Effect on High Velocity Impact Damage by : Tupili Subba Reddy
Download or read book Surface Residual Stresses in Shot Peened 6061-T6 Aluminum and Their Effect on High Velocity Impact Damage written by Tupili Subba Reddy and published by . This book was released on 1972 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Service Usage on Tensile, Fatigue, and Fracture Properties of 7075-T6 and 7178-T6 Aluminum Alloys by : Richard A. Everett
Download or read book Effect of Service Usage on Tensile, Fatigue, and Fracture Properties of 7075-T6 and 7178-T6 Aluminum Alloys written by Richard A. Everett and published by . This book was released on 1975 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Further Investigation of the Effect of Surface Finish on Fatigue Properties at Elevated Temperatures by : Robert L. Ferguson
Download or read book A Further Investigation of the Effect of Surface Finish on Fatigue Properties at Elevated Temperatures written by Robert L. Ferguson and published by . This book was released on 1954 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was conducted to evaluate the effects of surface roughness on fatigue properties of low-carbon N-155 alloy with a grain size of A.S.T.M. 6 and of S-816 alloyw with a grain size of A.S.T.M. 6 to 7. Fatigue studies were conducted at 80, 1200, and 1500 degrees F. In addition, an investigation of the effect of surface abrasion upon the nature, direction, and magnitude, and depth of residual stresses and of the effect of time and temperature upon the relief of these stresses was conducted.
