Analytical and finite element modelling of roughness induced crack closure


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), 343-353. (doi:10.1016/j.actamat.2003.09.019).

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Description/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.

Item Type: Article
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.
ISSNs: 1359-6454 (print)
Related URLs:
Keywords: crack closure, modelling, finite element, roughness
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TN Mining engineering. Metallurgy
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 22637
Date Deposited: 21 Mar 2006
Last Modified: 27 Mar 2014 18:11
Contact Email Address: i.sinclair@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/22637

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