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On numerical analysis of damage evolution in cyclic elastic‐plastic crack growth problems
Author(s) -
Skallerud B.,
Zhang Z. L.
Publication year - 2001
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 - 10.1046/j.1460-2695.2001.00353.x
Subject(s) - coalescence (physics) , materials science , crack closure , paris' law , void (composites) , structural engineering , crack growth resistance curve , finite element method , nucleation , fracture mechanics , tearing , plasticity , welding , crack tip opening displacement , composite material , engineering , chemistry , physics , organic chemistry , astrobiology
Structures subjected to severe cyclic loading may fail due to low cycle fatigue. During the latter part of the fatigue life the crack growth rate may increase due to crack growth from static failure modes. This was investigated numerically by Skallerud and Zhang ( Int. J. Solids Struct. 34, 3141–3161, 1997) for a butt‐welded plate with a circular crack growing from the centre of the weld. The weld material was slightly overmatching, and for simplicity, base material properties were employed in the finite element model. The predicted crack growth rate was significantly underpredicted in the early part of crack growth. In the present investigation, more detailed material modelling was used, and some metallurgical aspects were addressed. The fatigue part of the crack growth was determined by using the computed cyclic J ‐integral, and the static mode crack growth from ductile tearing is determined from computations accounting for void nucleation/growth/coalescence by means of a modified Gurson–Tvergaard model.