Threshold Fatigue Crack Growth for Aluminum Alloy, 2024-T3 PDF Download
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Author: Peter Hudulak
Publisher:
ISBN:
Category : Airframes
Languages : en
Pages : 16
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Book Description
Author: Peter Hudulak
Publisher:
ISBN:
Category : Airframes
Languages : en
Pages : 16
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Book Description
Author: Robert G. Dubensky
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 36
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Book Description
Author: EP. Phillips
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 11
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Book Description
Crack opening loads were determined in load-shedding fatigue crack growth threshold tests on 2024-T3 aluminum alloy at stress ratios R of -2, -1, 0, 0.33, 0.5, and 0.7. The effects of load-shedding procedure and rate were investigated. Values of threshold ?K were found to vary significantly with R, whereas values of threshold effective ?K did not. That is, the variation of threshold ?K with R was almost completely explained by accounting for the measured variation in crack opening load behavior with R. The load-shedding guidelines of ASTM Test Method for Measurement of Fatigue Crack Growth (E 647) produced a threshold ?K value for R = 0.7 that was in agreement with the value determined using a procedure that should minimize closure effects (constant-Kmax, increasing-Kmin test). At both R = 0 and R = 0.7, high load-shedding rates produced high values of threshold ?K caused by large closure effects.
Author: Patrick Joseph Cain
Publisher:
ISBN:
Category :
Languages : en
Pages : 256
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
Author: David Michael Lovell
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 138
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Book Description
Author: Walter Illg
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 24
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Book Description
Author: Anders F. Blom
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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Book Description
Author: J. C. Newman
Publisher: ASTM International
ISBN: 0803126247
Category : Fatigue
Languages : en
Pages : 436
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Book Description
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.
Author: M. Milan
Publisher:
ISBN:
Category : Aluminum
Languages : en
Pages : 20
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Book Description
Fatigue crack growth properties of friction stir welded joints of 2024-T3 aluminum alloy were studied via constant amplitude load (increasing ?K) testing under open air and accelerated salt fog exposure conditions. For low ?K values, longitudinal crack growth in the weld line center was slower under corrosion fatigue than by air because of the prevalence of corrosion-induced crack closure. On the other hand, growth rates of transverse crack crossing the weld nugget were not affected by the environment aggressiveness because of a balance between hydrogen embrittlement and corrosion inducing crack closure along with welding compressive residual stresses. For intermediate ?K values, propagation rates 5 times faster were observed for both longitudinal and transverse cracks under salt fog ambient as a result of hydrogen-induced embrittlement, which is favored by larger crack tip openings allowing local corrosive medium access. As the final catastrophic fracture approaches, longitudinal and transversal crack propagation rates under corrosion fatigue approximated the values observed in air testing, as time, under the 30-Hz loading frequency applied, was scarce for an effective interaction between crack tip fresh material and the hostile environment. For longitudinal cracks, precracking in air resulted in fatigue-corrosion limit factor ?Kth slightly lower than that obtained in salt fog precracked specimens, as the corrosive role played by the salt fog environment along the precrack introduction contributed to crack-closure effect, so increasing the apparent value of ?Kth. On the other hand, the environment in which a transverse precrack was created had a negligible effect on ?Kth because of the establishment of an equilibrium condition between corrosion-induced precrack closure and hydrogen embrittlement.
