Systematic assessment and validation of compliance-based crack closure measurements in fatigue
Systematic assessment and validation of compliance-based crack closure measurements in fatigue
Different methods of closure measurement and issues related to the identification of closure points are examined. Based on compliance curves obtained from crack mouth clip gauges and near-tip strain gauges, a systematic assessment of closure measurements has been made by a variety of non-subjective methods. Closure results obtained from compliance curves are also compared with direct crack tip observations. For results obtained on a commercial Al alloy, AA2024-T351 plate, it is shown that curve fitting methods based on a combination of linear and quadratic functions provide particularly sensitive and consistent closure measurements. The potential separation of plane stress and plane strain closure effects that arise in real, three-dimensional specimens is demonstrated via a combination of global compliance measurements and the use of side-grooved specimens
al alloy, fatigue, crack growth, closure measurements, shielding
114-125
Xu, Y.
30b17987-352d-4c0e-b58b-25c03dcd223d
Gregson, P.J.
ddc3b65d-18fb-4c11-9fa1-feb7e9cbe9fe
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
2000
Xu, Y.
30b17987-352d-4c0e-b58b-25c03dcd223d
Gregson, P.J.
ddc3b65d-18fb-4c11-9fa1-feb7e9cbe9fe
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Xu, Y., Gregson, P.J. and Sinclair, I.
(2000)
Systematic assessment and validation of compliance-based crack closure measurements in fatigue.
Materials Science and Engineering: A, 284 (1-2), .
(doi:10.1016/S0921-5093(00)00758-9).
Abstract
Different methods of closure measurement and issues related to the identification of closure points are examined. Based on compliance curves obtained from crack mouth clip gauges and near-tip strain gauges, a systematic assessment of closure measurements has been made by a variety of non-subjective methods. Closure results obtained from compliance curves are also compared with direct crack tip observations. For results obtained on a commercial Al alloy, AA2024-T351 plate, it is shown that curve fitting methods based on a combination of linear and quadratic functions provide particularly sensitive and consistent closure measurements. The potential separation of plane stress and plane strain closure effects that arise in real, three-dimensional specimens is demonstrated via a combination of global compliance measurements and the use of side-grooved specimens
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Published date: 2000
Keywords:
al alloy, fatigue, crack growth, closure measurements, shielding
Organisations:
Engineering Sciences
Identifiers
Local EPrints ID: 21594
URI: http://eprints.soton.ac.uk/id/eprint/21594
ISSN: 0921-5093
PURE UUID: 23528066-ec5e-4d47-9862-7bcb80b4ea53
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Date deposited: 08 Feb 2007
Last modified: 15 Mar 2024 06:31
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Author:
Y. Xu
Author:
P.J. Gregson
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