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The Effect Of Surface Corrosion Damage On The Fatigue Life Of Extruded Aluminum Alloy 6061 T6
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Book Synopsis The Effect of Surface Corrosion Damage on the Fatigue Life of Extruded Aluminum Alloy 6061-t6 by : Matthew Weber
Download or read book The Effect of Surface Corrosion Damage on the Fatigue Life of Extruded Aluminum Alloy 6061-t6 written by Matthew Weber and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminum alloy 6061-T6 is a common engineering material used in aerospace, automotive, structural applications. Despite its wide use, little has been published about the effects of damage from surface corrosion on its fatigue life. An investigation was performed where 6061-T6 extrusions were exposed to a 3.5% NaCl solution at pH 2 for 2 days and 24 days. The length of time and pH were chosen in order to create distinct surface flaws. The effect of these flaws on the fatigue life was then investigated and analyzed using scanning electron microscopy (SEM) and Weibull statistics. It was determined that samples corroded for both 2-days and 24-days exhibit fatigue lives that can be described using a 3-parameter Weibull distribution. The result of which was the determination of a threshold value for fatigue as well a general understanding of flaw geometry.
Book Synopsis Pit Morphology and Effect of Prior Pitting Corrosion on Fatigue Life in 7075-T6 and 7075-T6 Extruded Aluminum Alloys by : Mehmet Fatih Oktem
Download or read book Pit Morphology and Effect of Prior Pitting Corrosion on Fatigue Life in 7075-T6 and 7075-T6 Extruded Aluminum Alloys written by Mehmet Fatih Oktem and published by . This book was released on 2005 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Corrosion on the Fatigue Behavior of 2024-t4 Aluminum Alloy by : Clayton L. Harmsworth
Download or read book Effect of Corrosion on the Fatigue Behavior of 2024-t4 Aluminum Alloy written by Clayton L. Harmsworth and published by . This book was released on 1961 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was conducted to determine the effect of corrosion pitting on the fatigue behavior of 2024-T4 aluminum alloy and to establish a method of measuring pitting corrosion daage wih respect to fatigue. Surface roughness measurements were used to give a useful indication of the fatigue life that may be expected from a corroded structural member of 2024-T4 aluminum. The effect of pre-existing corrosion on the mechanism of fatigue was determined to be largely that of a stress raiser. In the case of pitting corrosion, calculaions could be made, based upon critical pit measurements, to determine the stress concentration effect of the corrosion pit. (Author).
Book Synopsis The Effects of Combined Prior Stress and Atmospheric Corrosion on the Fatigue Life of Aluminum Alloys by : Herbert A. Leybold
Download or read book The Effects of Combined Prior Stress and Atmospheric Corrosion on the Fatigue Life of Aluminum Alloys written by Herbert A. Leybold and published by . This book was released on 1964 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of the Effect of Corrosion Pitting on Fatigue Life of Aluminum Structure by : Eric J. Tuegel
Download or read book Investigation of the Effect of Corrosion Pitting on Fatigue Life of Aluminum Structure written by Eric J. Tuegel and published by . This book was released on 2003-10-01 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of testing to obtain data on the effect of pitting corrosion on the fatigue life of aluminum specimens. Forty-one coupons of 7075-T6 that had previously been exposed at various USAF bases around the world for up to a year were fatigue tested. The amount of corrosion on each had been previously characterized in terms of mass lost per unit of surface area. Additional characterization of the corrosion with surface roughness traces was done after the fatigue tests. After a threshold level of corrosion was reached, fatigue life generally decreased with increasing mass loss. Surface roughness generally increased with increasing mass loss as well. However, strong relationships could not be established in either case because of the limited amount of data and the scatter inherent in both fatigue and corrosion.
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 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 1978 with total page 1008 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis Encyclopedia of Aluminum and Its Alloys, Two-Volume Set (Print) by : George E. Totten
Download or read book Encyclopedia of Aluminum and Its Alloys, Two-Volume Set (Print) written by George E. Totten and published by CRC Press. This book was released on 2018-12-07 with total page 2957 pages. Available in PDF, EPUB and Kindle. Book excerpt: This encyclopedia, written by authoritative experts under the guidance of an international panel of key researchers from academia, national laboratories, and industry, is a comprehensive reference covering all major aspects of metallurgical science and engineering of aluminum and its alloys. Topics covered include extractive metallurgy, powder metallurgy (including processing), physical metallurgy, production engineering, corrosion engineering, thermal processing (processes such as metalworking and welding, heat treatment, rolling, casting, hot and cold forming), surface engineering and structure such as crystallography and metallography.
Book Synopsis Microstructure-sensitive Plasticity and Fatigue Modeling of Extruded 6061 Aluminum Alloys by : Robert Ross McCullough
Download or read book Microstructure-sensitive Plasticity and Fatigue Modeling of Extruded 6061 Aluminum Alloys written by Robert Ross McCullough and published by . This book was released on 2014 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, the development of fatigue failure and stress anisotropy in light weight ductile metal alloys, specifically Al-Mg-Si aluminum alloys, was investigated. The experiments were carried out on an extruded 6061 aluminum alloy. Reverse loading experiments were performed up to a prestrain of 5% in both tension-followed-by-compression and compression-followed-by-tension. The development of isotropic and kinematic hardening and subsequent anisotropy was indicated by the observation of the Bauschinger effect phenomenon. Experimental results show that 6061 aluminum alloy exhibited a slight increase in the kinematic hardening versus applied prestrain. However, the ratio of kinematic-to-isotropic hardening remained near unity. An internal state variable (ISV) plasticity and damage model was used to capture the evolution of the anisotropy for the as-received T6 and partially annealed conditions. Following the stress anisotropy experiments, the same extruded 6061 aluminum alloy was tested under fully reversing, strain-controlled low cycle fatigue at up to 2.5% strain amplitudes and two heat treatment conditions. Observations were made of the development of striation fields up to the point of nucleation at cracked and clustered precipitants and free surfaces through localized precipitant slip band development. A finite element enabled micro-mechanics study of fatigue damage development of local strain field in the presence of hard phases was conducted. Both the FEA and experimental data sets were utilized in the implementation of a multi-stage fatigue model in order to predict the microstructure response, including fatigue nucleation and propagation contributions on the total fatigue life in AA6061. Good correlation between experimental and predicted results in the number of cycles to final failure was observed. The AA6061 material maintained relatively consistent low cycle fatigue performance despite two different heat treatments.
Book Synopsis The Effect of Surface Coatings on the Fatigue Strength of Aluminum Alloys by :
Download or read book The Effect of Surface Coatings on the Fatigue Strength of Aluminum Alloys written by and published by . This book was released on 1981 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminum is a widely used metal in military applications such as vehicles, bridges, air-cushion vehicles, etc., but its use is limited to areas where the aluminum alloys would not be under load with variable or constant stresses and to areas where there would be almost no severe abrasion or corrosion. Anodic coatings tend to increase the abrasion and corrosion resistance of aluminum and its alloys, but the coatings have a detrimental effect on the fatigue endurance (in some instances by as much as 65 percent). The objective of this work was to provide a surface treatment and/or coatings that will allow the use of aluminum wrought alloys in any type of environment and that will be able to withstand the effects of abrasion and stress corrosion and temperature changes up to 344 deg F with an increased fatigue endurance. (Author).
Book Synopsis Corrosion Performance of High Strength Aluminum Alloys Effects of Mechanical Surface Treatments by : Mansour Hamed Mhaede Saad
Download or read book Corrosion Performance of High Strength Aluminum Alloys Effects of Mechanical Surface Treatments written by Mansour Hamed Mhaede Saad and published by . This book was released on 2009 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Stress-corrosion Cracking of Aluminum Alloys by : J. D. Jackson
Download or read book Stress-corrosion Cracking of Aluminum Alloys written by J. D. Jackson and published by . This book was released on 1965 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Investigation of the Effects of Atmospheric Corrosion on the Fatigue Life of Aluminum Alloys by : Herbert A. Leybold
Download or read book An Investigation of the Effects of Atmospheric Corrosion on the Fatigue Life of Aluminum Alloys written by Herbert A. Leybold and published by . This book was released on 1958 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue tests were conducted on 100 vibrating cantilever sheet specimens by applying 4,000 cycles of load in a 10-minute period each working day while the specimens were subjected to atmospheric conditions over a period of several months. cSpecimens of 2024-T3 and 7075-T6 aluminum alloys in both the bare and clad forms were tested. For comparison, 96 specimens were tested indoors. Atmospheric effects shortened the average lives of the specimens by a factor of about 3 for 7075-T6 and 2024-T3 in the bare condition and by a factor of about 1.5 for 7075-T6 in the clad condition, and had no significant effect on the average life of 2024-T3 clad specimens.
Book Synopsis Influence of Corrosion on the Fatigue Properties of Al 7075-T6 by : ML. Du
Download or read book Influence of Corrosion on the Fatigue Properties of Al 7075-T6 written by ML. Du and published by . This book was released on 1998 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chloride ion attack on Al 7075-T6 in aqueous hydrochloric acid leads to localized corrosion and subsequent initiation of fatigue cracks on the surface. Pitting is observed when the specimen is exposed to a corrosive environment. Microcracks, voids, extrusions, and intrusions are then formed during the fatigue process. From a global viewpoint, all of the corrosion and fatigue damage appears to be randomly oriented, resulting in a change in the surface roughness. The Laser Speckle Sensor technique is used to detect the minute surface texture change, associated with the damage caused by corrosion and fatigue. Nonuniform surface roughness is observed due to corrosion. The corrosion pits tend to coalesce along the rolling direction. The change in surface roughness is significant around the crack tip during the fatigue process. As a result there are synergistic activities; the surface roughness caused by corrosion and fatigue leads to crack initiation, and the crack growth further increases surface roughness.
Book Synopsis Correlation of Fatigue Life with Corrosion Damage in AA2024-T3 by : Christopher Joseph Kacmar
Download or read book Correlation of Fatigue Life with Corrosion Damage in AA2024-T3 written by Christopher Joseph Kacmar and published by . This book was released on 2003 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
