Analytical and finite element modelling of roughness induced crack closure
Analytical and finite element modelling of roughness induced crack closure
Crack closure is an established component of fatigue understanding, however, significant confusion remains in both experimental determination and micromechanical modelling. Analytical and finite element models of roughness induced crack closure (RICC) are developed in the present paper. A novel interpretation of RICC is explored where shear strains causing asperity contact arise explicitly from residual plastic deformation in the wake of a propagating crack, in a manner that is essentially analogous to plasticity induced crack closure (PICC). The analytical model estimates the crack opening along a simple deflected crack path, defined by a crack deflection angle and length, and residual shear at each asperity interfering with this opening to generate closure. The results from the analytical model are compared to finite element modelling and experimental results, with insight being provided into a controlling influence of the ratio of asperity size to plastic zone size on closure levels.
crack closure, modelling, finite element, roughness
343-353
Kamp, N.
ba7fdd8e-3e59-4c94-9cf5-944eda3e1050
Parry, M.R.
a16a4522-52e5-4f09-ae01-7d7af62d5e5b
Singh, K.D.
2b555378-706c-47d4-afa4-13934ef40706
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
January 2004
Kamp, N.
ba7fdd8e-3e59-4c94-9cf5-944eda3e1050
Parry, M.R.
a16a4522-52e5-4f09-ae01-7d7af62d5e5b
Singh, K.D.
2b555378-706c-47d4-afa4-13934ef40706
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Kamp, N., Parry, M.R., Singh, K.D. and Sinclair, I.
(2004)
Analytical and finite element modelling of roughness induced crack closure.
Acta Materialia, 52 (2), .
(doi:10.1016/j.actamat.2003.09.019).
Abstract
Crack closure is an established component of fatigue understanding, however, significant confusion remains in both experimental determination and micromechanical modelling. Analytical and finite element models of roughness induced crack closure (RICC) are developed in the present paper. A novel interpretation of RICC is explored where shear strains causing asperity contact arise explicitly from residual plastic deformation in the wake of a propagating crack, in a manner that is essentially analogous to plasticity induced crack closure (PICC). The analytical model estimates the crack opening along a simple deflected crack path, defined by a crack deflection angle and length, and residual shear at each asperity interfering with this opening to generate closure. The results from the analytical model are compared to finite element modelling and experimental results, with insight being provided into a controlling influence of the ratio of asperity size to plastic zone size on closure levels.
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Published date: January 2004
Additional Information:
Novel interpretation of roughness induced fatigue crack closure,
investigated in a variety of modelling approaches. To the authors knowledge, the first explanation of roughness induced closure with a physically realistic interpretation of shear offsets in the crack wake, providing unification with plasticity induced crack closure. Novelty in concept and approach, providing new theoretical insight, which is then distilled into a simple analytical framework.
Keywords:
crack closure, modelling, finite element, roughness
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 22637
URI: http://eprints.soton.ac.uk/id/eprint/22637
ISSN: 1359-6454
PURE UUID: f55c67af-763e-4b6e-9a92-1527dd62cf05
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Date deposited: 21 Mar 2006
Last modified: 15 Mar 2024 06:39
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Contributors
Author:
N. Kamp
Author:
M.R. Parry
Author:
K.D. Singh
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