Evaluation of the Effect of Crack Closure on Fatigue Crack Growth of Simulated Short Cracks PDF Download
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
Author: Wolf Elber
Publisher: ASTM International
ISBN: 0803109962
Category : Fracture mechanics
Languages : en
Pages : 671
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Book Description
Author: R. Craig McClung
Publisher: ASTM International
ISBN: 0803126115
Category : Fracture mechanics
Languages : en
Pages : 487
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Book Description
Author: RC. McClung
Publisher:
ISBN:
Category : Fatigue crack closure
Languages : en
Pages : 18
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Book Description
Load shedding procedures during fatigue crack growth threshold testing can, under some conditions, induce significant changes in fatigue crack closure levels, which can in turn artificially influence the apparent threshold level. In this paper, mechanics analyses of growing fatigue cracks that account for plasticity-induced closure are used to study load shed effects on crack opening levels during simulated threshold testing. Both finite element and FASTRAN strip yield models are employed, and the two approaches are compared. The current ASTM standard test method for determining thresholds is evaluated. Analyses explore the effects of initial stress, initial stress intensity factor, specimen size, material flow strength, and load shed rates on crack closure.
Author: J. Petit
Publisher: Springer
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 422
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Book Description
Author: E. Bednarz
Publisher:
ISBN:
Category : Crack closure
Languages : en
Pages : 19
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Book Description
Plasticity induced crack closure and its effect on the fatigue growth of short cracks is investigated numerically. A plane stress finite-element analysis is used to simulate a nonpropagating crack of length 65 ?m in a single-edge-cracked specimen under two stress levels and two values of stress ratio R. A comparison of results is then made with a propagating crack of an initial length of 25 ?m, which is allowed to grow to a final length of 65 ?m. R values of 0.1 and -1.0 with stress levels of 60 and 90% of the yield stress for the material are considered. The plastic zone size for each case studied is approximately equal to the initial crack length, which provides conditions characteristic of short cracks.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 230
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Book Description
Author: Peter C. McKeighan
Publisher: ASTM International
ISBN: 0803134797
Category : Aluminum alloys
Languages : en
Pages : 588
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Book Description
Author: BK. Parida
Publisher:
ISBN:
Category : Alkali-aggregate reactions
Languages : en
Pages : 10
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Book Description
Fatigue crack growth behavior of through-the-thickness cracks emanating from the notch root in an aluminum alloy was investigated with particular emphasis on the evaluation of crack closure and its effects on fatigue crack growth rate. The tests were performed on SE(T) specimens both under constant amplitude (CA) and spectrum (modified FALSTAFF) loads. The near-tip strain measurement method was used for crack closure estimation in the short and long crack ranges. An attempt was also made to determine the crack closure value corresponding to the crack-tip shielding through fractographic analysis.
Author: James M. Larsen
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 286
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Book Description
An investigation was performed to study the effects of slip character and crack closure on the propagation of small fatigue cracks in titanium- aluminum alloys. The materials examined were solution-treated Ti-4Al and Ti-8Al, as well as aged Ti-8Al. The propagation of naturally initiated surface cracks of depths as small as 25 micrometers was compared with the behavior of large through-thickness cracks. An extensometer was used to monitor crack closure throughout the large crack tests, and the closure behavior of the small cracks was measured using a computerized laser interferometric displacement gage having a displacement resolution of 0.01 micrometer. The measurements of crack closure were used to compute an effective stress intensity factor range. In all three alloys and for all test conditions, which included a range of stress levels and stress ratios, small cracks propagated faster than large cracks subjected to an equivalent Delta K, and the small cracks propagated under conditions that were significantly below the large-crack threshold, Delta K(th). Although the character and distribution of slip in Ti-Al alloys may have a dramatic influence on fatigue crack initiation and on the propagation of large cracks, this effect was minimal for small cracks.
