Fatigue crack growth modelling based on CTOD for the 7050‐T6 alloy | Zendy

Antunes F. V. | Zendy; Branco R. | Zendy; Prates P. A. | Zendy; Borrego L. | Zendy

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Fatigue crack growth modelling based on CTOD for the 7050‐T6 alloy

Author(s) -

Antunes F. V.,

Branco R.,

Prates P. A.,

Borrego L.

Publication year - 2017

Publication title -

fatigue and fracture of engineering materials and structures

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.887

H-Index - 84

eISSN - 1460-2695

pISSN - 8756-758X

DOI - 10.1111/ffe.12582

Subject(s) - crack tip opening displacement , materials science , crack closure , aluminium , alloy , displacement (psychology) , paris' law , aluminium alloy , crack growth resistance curve , plasticity , structural engineering , composite material , fracture mechanics , metallurgy , engineering , psychology , psychotherapist

The plastic crack tip opening displacement (CTOD p ) 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.

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