Short/Small crack model development for aircraft structural life assessment

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Proceedings title13th International Conference on Fracture 2013, ICF 2013
Conference13th International Conference on Fracture, June 16-21 2013, Beijing, China
AbstractThis paper presents the testing and modeling results from an NRC project on short/small1 crack model development for aircraft structures. Fatigue tests were conducted for 7075-T73 hand forging aluminium material using precracked compact tension (C(T)) and naturally cracked single edge-notch tension (SENT) coupons, under various stress ratios. The adjusted compliance ratio (ACR) method was used for the C(T) coupon tests aiming to quantify remote closure due to plasticity and forging-induced residual stresses. For the SENT coupons, three-dimensional StressCheck finite element (FE) models were developed to accurately calculate the stress intensity factors of surface and corner cracks. Both C(T) and SENT test data were combined to develop short-long fatigue crack growth rate models. These models were then used in crack growth life analyses for coupon and component cases, taken from transport aircraft under spectrum loadings. It was shown that the newly developed models resulted in more accurate fatigue life estimations.
Publication date
PublisherChinese Society of Theoretical and Applied Mechanics
AffiliationNational Research Council Canada; Aerospace
Peer reviewedYes
NPARC number23000607
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Record identifieree91e536-0ca9-44ac-9d46-ceb6c9e3b0a1
Record created2016-08-05
Record modified2016-08-05
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