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Elastic correction of fatigue crack growth laws
Author(s) -
Antunes Fernando,
Prates Pedro,
Camas Daniel,
Costa Jose
Publication year - 2019
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.12968
Subject(s) - materials science , crack closure , paris' law , aluminium , strain hardening exponent , plane stress , hardening (computing) , linear elasticity , composite material , exponent , plane (geometry) , range (aeronautics) , structural engineering , fracture mechanics , finite element method , mathematics , engineering , geometry , linguistics , philosophy , layer (electronics)
Fatigue crack growth (FCG) is usually studied assuming that Δ K is the driving parameter. An effective Δ K is considered in the presence of crack closure. However, after crack opening, there is an elastic regime that does not contribute to FCG. The objective here is to quantify this elastic range of Δ K , Δ K el , for different loading conditions and material properties. The yield stress was found to be the most important material parameter, followed by the hardening exponent. A linear decrease of Δ K el with Δ K was found for the 7050‐T6, 6082‐T6, and 6016‐T4 aluminium alloys, while the 304L stainless steel presented a slight increase. On the other hand, the increase of K max was found to increase the elastic fatigue range. Relatively high values of elastic range were obtained for the plane strain state, compared with the plane stress state.