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A numerical study of fatigue crack closure induced by plasticity
Author(s) -
ANTUNES F. V.,
BORREGO L. F. P.,
COSTA J. D.,
FERREIRA J. M.
Publication year - 2004
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/j.1460-2695.2004.00738.x
Subject(s) - crack closure , materials science , crack tip opening displacement , crack growth resistance curve , closure (psychology) , plasticity , structural engineering , finite element method , aluminium alloy , aluminium , paris' law , fracture mechanics , composite material , engineering , economics , market economy
ABSTRACT Crack closure delays the intrinsic mechanisms responsible for crack growth, therefore, it must be considered in fatigue crack growth modelling. The objective of this work is to develop a numerical procedure to predict crack closure induced by plasticity. First the crack closure was experimentally measured on M ( T ) 6082‐T6 aluminium alloy specimens of 3 mm thickness. A pin microgauge was used with the compliance technique. Then different parameters of the numerical procedure were analysed, namely the finite element mesh and the crack propagation scheme. The size of crack‐tip elements has an important influence and it is recommended to be of the same order of cyclic plastic zone. Crack‐opening levels only 10% lower than experimental results were obtained considering kinematic hardening and two load cycles in each increment.