Curve fitting of mixed-mode isopachics

Hebb, R.I., Dulieu-Barton, J.M., Worden, K. and Tatum, P., (2009) Curve fitting of mixed-mode isopachics Dulieu-Barton, J.M. (ed.) In 7th International Conference on Modern Practice in Stress and Vibration Analysis. vol. 181, Institute of Physics Publishing. 8 pp, p. 12062. (doi:10.1088/1742-6596/181/1/012062).


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Recent work has focused on exploiting the observation that the stress-sum contours (isopachics), obtained from TSA, in the vicinity of the tip take the form of a simple curve – the cardioid. The analysis made use of the cardioid nature of the isopachics by deriving expressions for the SIFs in terms of the cardioid area and the positions of certain tangents to the curve. Both Genetic Algorithms (GAs) and Differential Evolution (DE) have also proved successful for parameter estimation, but some of the curve-fits indicated that the cardioid form was inappropriate for the base model, particularly for mixed-mode cracks. The effect of cracktip interaction has been explored and shows this has a small effect on the cardioid form. New, higher resolution infra-red detectors have become available since the original data was collected, so the object of the current paper is to use new techniques to extract the cardioid form and use a GA to perform the curve fitting.

Item Type: Conference or Workshop Item (Paper)
Digital Object Identifier (DOI): doi:10.1088/1742-6596/181/1/012062
ISSNs: 0309-3247 (print)
Venue - Dates: 7th International Conference on Modern Practice in Stress and Vibration Analysis, 2009-09-08 - 2009-09-10
Related URLs:
Organisations: Fluid Structure Interactions Group
ePrint ID: 68657
Date :
Date Event
1 September 2009Published
Date Deposited: 14 Sep 2009
Last Modified: 18 Apr 2017 21:23
Further Information:Google Scholar

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