Elucidation of fatigue crack closure behaviour in surface crack by 3-D finite element analysis

A 3-D elastic-plastic finite element analysis of fatigue crack closure for semi-circular crack is performed. The stabilization behaviour of crack opening level, the effect of mesh size, the effect of initial crack length, the opening process of crack surface and the shortcoming and sensitivity of experimental measurement methods are investigated. The crack opening load tends to increase with the decrease of mesh size. Irrespective of an initial crack length, all the first nodes behind the crack tip along the front of surface crack are the last to open. The plane strain-opening load at the deepest point measured by extensometer at the midpoint of crack mouth may be estimated to be higher than the actual. The crack opening load experimentally measured by strain gauge boned in the vicinity of the surface intersection point can successfully represent the plane stress crack opening of the free surface. (c) 2006 Elsevier Ltd. All rights reserved.
Publisher
Elsevier Sci Ltd
Issue Date
2007-01
Language
ENG
Keywords

PLANE-STRAIN CONDITIONS; MESH SIZE; GROWTH; FLAWS; PROPAGATION; SIMULATION

Citation

INTERNATIONAL JOURNAL OF FATIGUE, v.29, no.1, pp.168 - 180

ISSN
0142-1123
DOI
10.1016/j.ijfatigue.2006.01.016
URI
http://hdl.handle.net/10203/87451
Appears in Collection
ME-Journal Papers(저널논문)
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