Fatigue crack growth modelling based on CTOD for the 7050‐T6 alloy. Issue 8 (30th January 2017)

• Record Type: Journal Article
• Authors: Antunes, F. V.; Branco, R.; Prates, P. A.; Borrego, L.
• Other Names: Božić Željko guestEditor.; Matvienko Yury guestEditor.
• Is Part Of: Fatigue & fracture of engineering materials & structures. Volume 40:Issue 8(2017:Aug.)
• Page Start: 1309
• Page End: 1320
• Publication Date: 2017-01-30
• Subjects: 7050‐T6 aluminium alloy -- cyclic plastic deformation -- fatigue crack growth -- CTOD; Materials -- Fatigue -- Periodicals; Fracture mechanics -- Periodicals; 620.1123
• DOI: 10.1111/ffe.12582
• Languages: English
• ISSNs: 8756-758X

Abstract

Abstract: The plastic crack tip opening displacement (CTODp ) is considered to replace Δ K in the study of fatigue crack propagation. The cyclic plastic deformation of the 7050‐T6 aluminium alloy was determined experimentally and modeled analytically. Then, a three‐dimensional elastic–plastic numerical model which included crack growth was developed in order to predict the plastic CTOD for different loading conditions. In a parallel study, crack growth rates were determined experimentally in M(T) specimens with a thickness of 6 mm. A relation was subsequently established between da/dN and plastic CTOD for the 7050‐T6 aluminium alloy, independent of stress ratio, showing that the CTOD is a viable alternative to Δ K in the analysis of fatigue crack propagation.