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Fatigue crack growth in 7249-T76511 aluminium alloy under constant-amplitude and spectrum loading

Par Conseil national de recherches du Canada

DOITrouver le DOI : https://doi.org/10.1111/ffe.12253
AuteurRechercher : ; Rechercher : ; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Aérospatiale
FormatTexte, Article
SujetAlloys; Aluminum; Aluminum alloys; Amplitude modulation; Crack closure; Crack propagation; Fatigue crack propagation; Fatigue of materials; Fatigue testing; Strain; Stress analysis; Stress intensity factors; Wings; Compression pre crackings; Constant amplitude; Constraint factor; Crack mouth opening displacement; Effective stress intensity factor range; Fatigue-crack-growth tests; Full-scale fatigue test; Spectrum loading; Cracks
Résumé
Fatigue crack growth tests were conducted on compact, C(T), specimens made of 7249-T76511 aluminium alloy. These tests were conducted to generate crack growth rate data from threshold to near fracture over a wide range of load ratios (R). Four methods were used to generate near threshold data: (1) ASTM E-647 load reduction (LR), (2) compression pre-cracking constant-amplitude (CPCA), (3) compression pre-cracking LR, and (4) constant crack mouth opening displacement LR method. A crack closure analysis was used to develop an effective stress-intensity factor range against rate relation using a constraint factor (α = 1.85). Simulated aircraft wing spectrum tests were conducted on middle crack tension, M(T), specimens using a modified full-scale fatigue test spectrum. The tests were used to develop the constraint-loss regime (plane strain to plane stress; α = 1.85 to 1.15) behaviour. Comparisons were made between the spectrum tests and calculations made with the FASTRAN life prediction code; and the calculated crack growth lives were generally with ±10% of the test results.
Date de publication
Dans
  • Fatigue and Fracture of Engineering Materials and Structures 38, nº 5 (9 avril 2015) : 528–539.
Langueanglais
Publications évaluées par des pairsOui
Numéro NPARC21275715
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Identificateur de l’enregistrement675672da-b322-4bba-8651-716e824dc405
Enregistrement créé2015-07-14
Enregistrement modifié2020-04-22
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