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Simulating small crack growth behaviour using crystal plasticity theory and finite element analysis
Author(s) -
POTIRNICHE G. P.,
DANIEWICZ S. R.,
NEWMAN J. C.
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.1460-2695.2004.00720.x
Subject(s) - materials science , crack tip opening displacement , finite element method , crack closure , plasticity , crack growth resistance curve , paris' law , grain boundary , anisotropy , structural engineering , lüders band , aluminium , computation , fracture mechanics , slip (aerodynamics) , aluminium alloy , mechanics , composite material , dislocation , mathematics , engineering , microstructure , physics , thermodynamics , quantum mechanics , algorithm
Predictions of small crack growth under cyclic loading in aluminium alloy 7075 are performed using finite element analysis (FEA), and results are compared with published experimental data. A double‐slip crystal plasticity model is implemented within the analyses to enable the anisotropic nature of individual grains to be approximated. Small edge‐cracks in a single grain with a starting length of 6 μm are incrementally grown following a node‐release scheme. Crack‐tip opening displacements (CTOD) and crack opening stresses are calculated during the simulated crack growth, and d a/ d N against Δ K diagrams are computed. Interactions between the crack tip and a grain boundary are also considered. The computations are shown to accurately capture the magnitude and the variability normally observed in small crack fatigue data.