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Accelerated Near Threshold Fatigue Crack Growth Behavior Of An Aluminum Powder Metallurgy Alloy
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Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781724083333 Total Pages :26 pages Book Rating :4.0/5 (833 download)
Book Synopsis Accelerated Near-Threshold Fatigue Crack Growth Behavior of an Aluminum Powder Metallurgy Alloy by : National Aeronautics and Space Adm Nasa
Download or read book Accelerated Near-Threshold Fatigue Crack Growth Behavior of an Aluminum Powder Metallurgy Alloy written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-27 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue crack growth (FCG) research conducted in the near threshold regime has identified a room temperature creep crack growth damage mechanism for a fine grain powder metallurgy (PM) aluminum alloy (8009). At very low DK, an abrupt acceleration in room temperature FCG rate occurs at high stress ratio (R = Kmin/Kmax). The near threshold accelerated FCG rates are exacerbated by increased levels of Kmax (Kmax less than 0.4 KIC). Detailed fractographic analysis correlates accelerated FCG with the formation of crack-tip process zone micro-void damage. Experimental results show that the near threshold and Kmax influenced accelerated crack growth is time and temperature dependent. Piascik, Robert S. and Newman, John A. Langley Research Center NASA/TM-2002-211676, L-18180, NAS 1.15:211676, ARL-TR-2728
Book Synopsis Accelerated Near-Threshold Fatigue Crack Growth Behavior of an Aluminum Powder Metallurgy Alloy by :
Download or read book Accelerated Near-Threshold Fatigue Crack Growth Behavior of an Aluminum Powder Metallurgy Alloy written by and published by . This book was released on 2002 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Near-Threshold Fatigue Crack Growth Behavior of Fine-Grain Nickel-Based Alloys by : John A. Newman
Download or read book Near-Threshold Fatigue Crack Growth Behavior of Fine-Grain Nickel-Based Alloys written by John A. Newman and published by . This book was released on 2003 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Kmax on Fatigue Crack Growth Threshold in Aluminum Alloys by : WT. Riddell
Download or read book Effects of Kmax on Fatigue Crack Growth Threshold in Aluminum Alloys written by WT. Riddell and published by . This book was released on 2000 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effects of Kmax on closure-free, near-threshold fatigue crack growth are examined in ingot metallurgy aluminum alloys 2024 and 7050, and powder metallurgy aluminum alloy 8009. Significantly lower closure-free fatigue crack growth thresholds, as well as accelerated fatigue crack growth rates, were observed as Kmax increased. Results indicate that no single value of fatigue crack growth threshold exists, because near-threshold fatigue crack growth is dependent on both Kmax and ?K. The near-threshold Kmax effect is linked to an increase in crack-tip void production. Experimental observations suggest that Kmax-accelerated, closure-free, near-threshold fatigue crack growth rates were caused by changes in crack-tip process zone damage mechanism(s) that are a result of increased crack-tip driving force.
Book Synopsis An Investigation of Fatigue Crack Growth Behavior in Cast Particulate Reinforced Aluminum Alloys by : Anthony George Keslinke
Download or read book An Investigation of Fatigue Crack Growth Behavior in Cast Particulate Reinforced Aluminum Alloys written by Anthony George Keslinke and published by . This book was released on 1990 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Crack Growth Thresholds, Endurance Limits, and Design by : J. C. Newman
Download or read book Fatigue Crack Growth Thresholds, Endurance Limits, and Design written by J. C. Newman and published by ASTM International. This book was released on 2000 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Contains 24 papers from the November, 1998 symposium of the same name, sponsored by the ASTM Committee E8 on Fatigue and Fracture, and presented by Newman and Piascik (both of the NASA Langley Research Center). The papers focus on such areas as fatigue-crack growth threshold mechanisms, loading and specimen-type effects, analyses of fatigue-crack-growth-threshold behavior, and applications of threshold concepts and endurance limits to aerospace and structural materials. Annotation copyrighted by Book News, Inc., Portland, OR.
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 1984 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental work on the fatigue crack growth characteristics of high strength P/M (Powder Metallurgy) aluminum alloys has been extended, with particular attention given to crack closure in the near threshold region as a function of R. It has been conclusively shown that the R-dependence of the threshold level is directly related to closure. In the absence of closure as in ultra-fine grained material the threshold level is independent of the R-ratio. Experimental work has been initiated on the growth of fatigue cracks under variable amplitude loading conditions. An approach to deal with topics such as the anomalous growth of short cracks, the non-propagation of cracks from notches, fatigue notch sensitivity, and the notch size-effect in fatigue has been developed. A comparison of the fatigue behavior of powder metallurgy and ingot metallurgy products has been initiated. Thus far out work indicates that P/M products can be produced which are free from manufacturing defects which might degrade fatigue properties of these high strength aluminum alloys. The fatigue properties are responsive to grain size, fracture toughness, and the degree of closure developed.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721587025 Total Pages :28 pages Book Rating :4.5/5 (87 download)
Book Synopsis Near-Threshold Fatigue Crack Growth Behavior of Fine-Grain Nickel-Based Alloys by : National Aeronautics and Space Administration (NASA)
Download or read book Near-Threshold Fatigue Crack Growth Behavior of Fine-Grain Nickel-Based Alloys written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constant-Kmax fatigue crack growth tests were performed on two finegrain nickel-base alloys Inconel 718 (DA) and Ren 95 to determine if these alloys exhibit near-threshold time-dependent crack growth behavior observed for fine-grain aluminum alloys in room-temperature laboratory air. Test results showed that increases in K(sub max) values resulted in increased crack growth rates, but no evidence of time-dependent crack growth was observed for either nickel-base alloy at room temperature. Newman, John A. and Piascik, Robert S. Langley Research Center NASA/TM-2003-212443, NAS 1.15:212443, L-18314, ARL-TR-3021
Book Synopsis The Influence of Crack Closure on the Near-threshold Fatigue Crack Growth Behavior of Aluminum Alloys IN9021-T4 and 2020-T6 by : Gregory William Levan
Download or read book The Influence of Crack Closure on the Near-threshold Fatigue Crack Growth Behavior of Aluminum Alloys IN9021-T4 and 2020-T6 written by Gregory William Levan and published by . This book was released on 1984 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Constant Amplitude and Post-overload Fatigue Crack Growth Behavior in PM Aluminum Alloy AA 8009 by :
Download or read book Constant Amplitude and Post-overload Fatigue Crack Growth Behavior in PM Aluminum Alloy AA 8009 written by and published by . This book was released on 1991 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722126582 Total Pages :34 pages Book Rating :4.1/5 (265 download)
Book Synopsis Constant Amplitude and Post-Overload Fatigue Crack Growth Behavior in PM Aluminum Alloy AA 8009 by : National Aeronautics and Space Administration (NASA)
Download or read book Constant Amplitude and Post-Overload Fatigue Crack Growth Behavior in PM Aluminum Alloy AA 8009 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-30 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: A recently developed, rapidly solidified, powder metallurgy, dispersion strengthened aluminum alloy, AA 8009, was fatigue tested at room temperature in lab air. Constant amplitude/constant delta kappa and single spike overload conditions were examined. High fatigue crack growth rates and low crack closure levels compared to typical ingot metallurgy aluminum alloys were observed. It was proposed that minimal crack roughness, crack path deflection, and limited slip reversibility, resulting from ultra-fine microstructure, were responsible for the relatively poor da/dN-delta kappa performance of AA 8009 as compared to that of typical IM aluminum alloys. Reynolds, A. P. Langley Research Center RTOP 505-63-50-04...
Book Synopsis Environmentally Influenced Near-Threshold Fatigue Crack Growth in 7075-T651 Aluminum Alloy by : HC. Sanders
Download or read book Environmentally Influenced Near-Threshold Fatigue Crack Growth in 7075-T651 Aluminum Alloy written by HC. Sanders and published by . This book was released on 2000 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The near-threshold fatigue crack growth behavior of the 7075-T651 aluminum alloy was studied in laboratory air, vacuum, and an aqueous 3.5% NaCl solution. Results indicate that a rising stress ratio (R) enhanced the near-threshold fatigue crack growth by increasing the crack growth rate (da/dN) and decreasing the threshold stress intensity range (?Kth) in both laboratory air and aqueous 3.5% NaCl solution. However, the reverse was observed in vacuum. It was also noticed that the near-threshold fatigue crack growth resistance was greatest in vacuum, intermediate in aqueous 3.5% NaCl solution, and lowest in laboratory air. Conversely, the crack growth rate at given values of AK were shown to be greatest in laboratory air, less in 3.5% NaCl solution, and lowest in vacuum. In both laboratory air and aqueous 3.5% NaCl solution, ?Kth, initially decreased with increasing R until a critical stress ratio of Rc = 0.5 was reached, which it then leveled off or decreased slightly. The ?Kth values for these two environments appear to converge at a higher R. On the other hand, in vacuum, the ?Kth, increased linearly with increasing R. In addition, at lower R, a greater resistance to near-threshold fatigue crack growth was detected in aqueous 3.5% NaCl solution than in laboratory air. This is presumably attributed to crack closure that has been induced by accumulation of corrosion product in the crack-tip.
Book Synopsis Mechanisms of Fatigue Crack Growth in Particulate and Whisker Reinforced Aluminum Alloys by : James Joseph Mason
Download or read book Mechanisms of Fatigue Crack Growth in Particulate and Whisker Reinforced Aluminum Alloys written by James Joseph Mason and published by . This book was released on 1988 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Spectrum Fatigue Crack Propagation in Two Aluminum Alloys. 2: Influence of Microstructures by : Jack Telesman
Download or read book A Study of Spectrum Fatigue Crack Propagation in Two Aluminum Alloys. 2: Influence of Microstructures written by Jack Telesman and published by . This book was released on 1985 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 1991 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Crack Growth Behavior in Alloy C415 in the Near Threshold Region by : Ashok Saxena
Download or read book Fatigue Crack Growth Behavior in Alloy C415 in the Near Threshold Region written by Ashok Saxena and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Spectrum Fatigue Crack Propagation in Two Aluminum Alloys. 1: Spectrum Simplification by : Jack Telesman
Download or read book A Study of Spectrum Fatigue Crack Propagation in Two Aluminum Alloys. 1: Spectrum Simplification written by Jack Telesman and published by . This book was released on 1985 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
