A Constant Amplitude Fatigue Study Of An Aluminum Powder Metallurgy Alloy

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A Constant Amplitude Fatigue Study of an Aluminum Powder Metallurgy Alloy

Author : JS. Santner
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis A Constant Amplitude Fatigue Study of an Aluminum Powder Metallurgy Alloy by : JS. Santner

Download or read book A Constant Amplitude Fatigue Study of an Aluminum Powder Metallurgy Alloy written by JS. Santner and published by . This book was released on 1983 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three test conditions were chosen to conduct multiple constant amplitude fatigue tests on a powder metallurgy (P/M) aluminum alloy. These test conditions were chosen to produce mean target fatigue lives near 1, 50, and 200 kilocycles. A statistical rule was used to select specimens for fractographic examination. Two product forms, a forging and an extrusion, were tested in both the L and L-T orientation. The forging has approximately an 8% lower yield strength and a 20% higher reduction in area than the extrusion. At the 1-kilocycle target fatigue life, the more ductile forging has a statistically better fatigue performance. Beyond 10 kilocycles, the higher strength extrusion appears to have a longer life, although this was not statistically verified. It is suspected this is because of the increased variance at these longer fatigue lives. Further testing is required to verify this point. Additional testing of the extrusion showed that if the data are fitted to a Weibull model, the P/M extrusion has a vastly different failure rate than reported for ingot metallurgy (I/M) products. A decreasing failure rate for the P/M extrusion was verified with a nonparametric test. The difference in failure rates may be related to the finer grain size and constituent particle size found in P/M aluminum products. Additional study is needed to verify this hypothesis.

Constant Amplitude and Post-Overload Fatigue Crack Growth Behavior in PM Aluminum Alloy AA 8009

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)

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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...

Constant Amplitude and Post-overload Fatigue Crack Growth Behavior in PM Aluminum Alloy AA 8009

Author :
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (317 download)

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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:

Spectrum Fatigue Behaviour of Powder Metallurgy Aluminum Alloys

Author : G. V. Searich
Publisher :
ISBN 13 :
Total Pages : 275 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Spectrum Fatigue Behaviour of Powder Metallurgy Aluminum Alloys by : G. V. Searich

Download or read book Spectrum Fatigue Behaviour of Powder Metallurgy Aluminum Alloys written by G. V. Searich and published by . This book was released on 1991 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue crack growth behavior of three aluminum alloys was examined under constant amplitude and spectrum loading. The fatigue behavior of extrusions and hand forgings of second-generation powder metallurgy (PM) alloy CW67 (X7093) was compared to the fatigue behavior of extrusions of 7091 (a first-generation PM alloy) and 7075 (an ingot metallurgy alloy). Spectrum fatigue crack growth tests were performed using the FALSTAFF fighter spectrum as well as an actual fighter aircraft spectrum. Additionally, overload/underload fatigue crack growth tests were performed to correlate the constant amplitude and spectrum fatigue behaviors. For these tests, overload-induced crack jumps and crack growth retardation were measured. Tensile properties, fracture toughness, stress-life fatigue, and stress corrosion cracking were also evaluated. For the spectrum fatigue tests in particular, the crack growth behavior was correlated to the microstructure and fractography. In summary, the fine-grained PM alloys exhibited significantly higher strengths, toughness, and stress -life fatigue resistance than 7075, but markedly lower constant amplitude fatigue crack growth resistance. Under a tension-dominated FALSTAFF spectrum, PM alloys were generally inferior in crack growth resistance compared to IM alloys, which is consistent with constant amplitude fatigue behavior. However, in spectrums having more compressive loads, Fatigue, Fatigue Crack Growth, Spectrum Fatigue, Overload, FALSTAFF, Powder Metallurgy, Aluminum Alloys, CW67, X7093, 7091, 7075, Stress Corrosion, Fractography.

Effects of Changing Stress Amplitude on the Rate of Fatigue-crack Propagation in Two Aluminum Alloys

Author : C. M. Hudson
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (31 download)

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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.

A Study of Spectrum Fatigue Crack Propagation in Two Aluminum Alloys. 1: Spectrum Simplification

Author : Jack Telesman
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (317 download)

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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:

A Fundamental Study of Fatigue in Powder Metallurgy Aluminum Alloys

Author : M. J. Koczak
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis A Fundamental Study of Fatigue in Powder Metallurgy Aluminum Alloys by : M. J. Koczak

Download or read book A Fundamental Study of Fatigue in Powder Metallurgy Aluminum Alloys written by M. J. Koczak and published by . This book was released on 1978 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue response in high strength powder metallurgy aluminum alloys is being evaluated; the primary objective is to establish and understand processing-microstructure-fatigue integrity relationships. The program includes stress-controlled low and high cycle response and a determination of crack propagation rates in both air and saline environments. In scope, there are two concurrent phases of research; in one, the combined effects of powder processing mode and cobalt level (0, 0.4, 0.8%) on fatigue are examined while in the other, cobalt level is kept constant (0.4%) but the powder alloy is processed to give differing but known/controlled levels of deformation (material flow) by forging. S-N curves for axial fatigue (R equal to 0.1) in air reveal a strong influence of processing mode on life in alloys containing cobalt. Anisotropy in fatigue response is observed for each condition of cobalt level and processing mode examined; the degree of anisotropy is a function of processing mode if cobalt is present.

Accelerated Near-Threshold Fatigue Crack Growth Behavior of an Aluminum Powder Metallurgy Alloy

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721502271
Total Pages : 26 pages
Book Rating : 4.5/5 (22 download)

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Book Synopsis Accelerated Near-Threshold Fatigue Crack Growth Behavior of an Aluminum Powder Metallurgy Alloy by : National Aeronautics and Space Administration (NASA)

Download or read book Accelerated Near-Threshold Fatigue Crack Growth Behavior of an Aluminum Powder Metallurgy Alloy written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 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

Accelerated Near-Threshold Fatigue Crack Growth Behavior of an Aluminum Powder Metallurgy Alloy

Author :
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (317 download)

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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:

A Study of Spectrum Fatigue Crack Propagation in Two Aluminum Alloys. 2: Influence of Microstructures

Author : Jack Telesman
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (317 download)

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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:

The Fatigue of Powder Metallurgy Alloys

Author : A. J. McEvily
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (227 download)

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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.

High-strength Powder Metallurgy Aluminum Alloys

Author : Michael J. Koczak
Publisher :
ISBN 13 :
Total Pages : 436 pages
Book Rating : 4.:/5 (44 download)

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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:

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 584 pages
Book Rating : 4.:/5 (3 download)

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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 1994 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fatigue Prediction Study

Author : G. V. Deneff
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Fatigue Prediction Study by : G. V. Deneff

Download or read book Fatigue Prediction Study written by G. V. Deneff and published by . This book was released on 1962 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

On Stress Interaction in Fatigue and Cumulative Damage Rule

Author : Alfred M. Freudenthal
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis On Stress Interaction in Fatigue and Cumulative Damage Rule by : Alfred M. Freudenthal

Download or read book On Stress Interaction in Fatigue and Cumulative Damage Rule written by Alfred M. Freudenthal and published by . This book was released on 1960 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fatigue in Some Aluminum Alloys with Constant Force Or Constant Amplitude Control at 20 Khz

Author : B. S. HOCKENHULL
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Fatigue in Some Aluminum Alloys with Constant Force Or Constant Amplitude Control at 20 Khz by : B. S. HOCKENHULL

Download or read book Fatigue in Some Aluminum Alloys with Constant Force Or Constant Amplitude Control at 20 Khz written by B. S. HOCKENHULL and published by . This book was released on 1970 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fatigue of Materials III

Author : Raghavan Srinivasan
Publisher : Springer
ISBN 13 : 3319482408
Total Pages : 274 pages
Book Rating : 4.3/5 (194 download)

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Book Synopsis Fatigue of Materials III by : Raghavan Srinivasan

Download or read book Fatigue of Materials III written by Raghavan Srinivasan and published by Springer. This book was released on 2016-12-01 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains papers presented in the third international symposium titled Fatigue of Materials: Advances and Emergences in Understanding held during the Materials Science and Technology 2014 meeting. The book contains contributions from engineers, technologists, and scientists from academia, research laboratories, and industries. The papers are divided into six topical areas: Session 1: Aluminum Alloys Session 2: Ferrous Materials I Session 3: Ferrous Materials II Session 4: Composite Materials Session 5: Advanced Materials Session 6: Modeling The papers cover a broad spectrum of topics that represent the truly diverse nature of the subject of fatigue as it relates to the world of materials.