Near-threshold Fatigue Crack Propagation and Closure Behaviour in an Aluminium Alloy PDF Download
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Author: W. Zhao
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
Author: W. Zhao
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
Author: Gregory William Levan
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 178
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Book Description
Author: Jan Bäcklund
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 624
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Book Description
Author: Anthony George Keslinke
Publisher:
ISBN:
Category :
Languages : en
Pages : 170
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Author: Anders F. Blom
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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Author: Talal Mehdi Senhaji
Publisher:
ISBN:
Category :
Languages : en
Pages : 58
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Book Description
Fatigue-crack-growth-rate tests were conducted on compact tension specimens made of 7050-T7451 aluminum alloy and 9310 steel. Compact tension specimens were tested over a wide range of load ratios (0.1 ≤ R ≤ 0.9) to generate crack-growth-rate data from threshold to near fracture. Three methods were used to generate near threshold data. A crack-closure analysis was performed on both materials using the FASTRAN crack-closure model. The crack-growth-rate data for each material correlated very well and each collapsed onto a nearly unique curve in the low- and mid-rate regimes using the strip-yield model in the FASTRAN life-prediction code. For the 7050 alloy, a constraint factor of a = 1.8 was required, while for the 9310 steel a = 2.5 worked very well in correlating the test data over a very wide range in R values and rates from threshold to near fracture.
Author:
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Category :
Languages : en
Pages : 11
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Author: Dong-Hwan Park
Publisher:
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Category :
Languages : en
Pages :
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Author: Ulrich Krupp
Publisher: John Wiley & Sons
ISBN: 3527315373
Category : Technology & Engineering
Languages : en
Pages : 312
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Book Description
This comprehensive overview of the whole field of fatigue and fracture of metallic materials covers both the theoretical background and some of the latest experimental techniques. It provides a summary of the complex interactions between material microstructure and cracks, classifying them with respect to the overall damage process with a focus on microstructurally short cracks and dynamic embrittlement. It furthermore introduces new concepts for the numerical treatment of fatigue microcrack propagation and their implementation in fatigue-life prediction models.This comprehensive overview of the whole field of fatigue and fracture of metallic materials covers both the theoretical background and the latest experimental techniques. It provides a summary of the complex interactions between material microstructure and cracks, classifying them with respect to the overall damage process. It furthermore introduces new concepts for the numerical treatment of fatigue microcrack propagation and their implementation in fatigue-life prediction models.
Author: AF. Blom
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 17
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Book Description
The development of crack closure during the extension of long and short fatigue cracks has been investigated in a 2124 aluminum alloy using both experimental and numerical procedures. Specifically, the growth rate and closure behavior of long (~17 to 38 mm) cracks in compact C(T) specimens and through-thickness physically-short (~50 to 40 ?m) cracks in single-edge-notched SEN(B) bend specimens have been examined experimentally from threshold levels to instability (over the range ~10-12 to 10-7 m/cycle), and results compared with those predicted numerically using an elastic-plastic finite-element analysis of fatigue crack advance in plane strain. It is shown that the numerical analysis consistently underpredicts the magnitude of crack closure for both long and short cracks, particularly at near-threshold levels; an observation attributed to the fact that the numerical procedures can only model contributions to closure from cyclic plasticity, whereas, in reality, significant additional closure arises from the wedging action of fracture surface asperities and corrosion debris. Such closure is shown to provide the predominant mechanism for rationalizing differences in the growth rate behavior between long and physically short cracks, although other factors, such as the nature of the singularity and the extent of local plasticity, are deemed potentially to be important.
