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Numerical modelling of roughness and plasticity induced crack closure effects in fatigue

Record type: Conference or Workshop Item (Paper)

The incidence of roughness induced fatigue crack closure has been studied by finite element modelling. Based on an analysis of both overall specimen compliance and node behaviour along the crack path the present modelling shows: (a) an increasing effect of crack path angle on roughness induced closure levels in keeping iwht the simple analytical model of Suresh and Ritchie; (b) the mechanism by which closure occurs is due to residual plastic strains in the wake, rather than global shear displacements of the fracture surfaces due to mixed-mode behaviour at the crack tip; and (c) the closure levels are relatively low compared to experimental data, consistent with the absence of environmental irreversibility in the finite element models and the idealised crack path morphologies that were used. Slip band simulations show a significant increasing effect of inhomogeneous deformation on closure levels, improving hte apparent accuracy of the modelling results.

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Citation

Parry, M.R., Syngellakis, S. and Sinclair, I., (2000) Numerical modelling of roughness and plasticity induced crack closure effects in fatigue Strarke, Jr., E.A., Sanders, Jr., T.H. and Cassada, W.A. (eds.) In Aluminium Alloys - Their Physical and Mechanical Properties. Trans Tech., pp. 1473-1478.

More information

Published date: 2000
Venue - Dates: 7th International Conference ICAA7, 2000-04-09 - 2000-04-14

Identifiers

Local EPrints ID: 21421
URI: http://eprints.soton.ac.uk/id/eprint/21421
ISBN: 0878498532
PURE UUID: 0d731466-c906-4c8f-ba41-aa5291fcacde

Catalogue record

Date deposited: 15 Mar 2007
Last modified: 17 Jul 2017 16:26

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Contributors

Author: M.R. Parry
Author: S. Syngellakis
Author: I. Sinclair
Editor: E.A. Strarke, Jr.
Editor: T.H. Sanders, Jr.
Editor: W.A. Cassada

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