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Towards the derivation of stress intensity factors by parametric modelling of full-field thermoelastic data

Towards the derivation of stress intensity factors by parametric modelling of full-field thermoelastic data
Towards the derivation of stress intensity factors by parametric modelling of full-field thermoelastic data
Thermoelastic Stress Analysis (TSA) is a well-established full-field technique for
experimental stress analysis that has proved to be extremely effective for studying stress fields in
the vicinity of cracks. Recently, work has focused on the observation that the stress-sum contours
(isopachics) obtained from TSA take the form of a cardioid. Genetic Algorithms (GAs) and
Differential Evolution (DE) have proved successful for accurate parameter estimation of the
cardioids, thus allowing the SIFs to be calculated. Originally, some curve-fits indicated that a pure
cardioid form is inappropriate for the base model, especially for mixed-mode cracks. The deviation
from the cardioid form has been shown to be due to higher-order terms within the stress function.
The objective of the current paper is to use a modified version of the original methodology (that
fitted parameters to a single isopachic) to find the higher-order parameters from the entire data field
obtained from the TSA.
0-87849-248-8
0309-3247
227-232
Trans Tech
Hebb, R.I.
4ad5e050-1114-460d-be69-da69573b0673
Dulieu-Barton, J.M.
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Worden, K.
07522936-fd47-4df2-b75e-c3d297d104b3
Tatum, P.
e21d5e2a-2ddc-4a87-9cd0-7c147e84d875
Dulieu-Barton, J.M.
Mines, R.A.W.
Hebb, R.I.
4ad5e050-1114-460d-be69-da69573b0673
Dulieu-Barton, J.M.
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Worden, K.
07522936-fd47-4df2-b75e-c3d297d104b3
Tatum, P.
e21d5e2a-2ddc-4a87-9cd0-7c147e84d875
Dulieu-Barton, J.M.
Mines, R.A.W.

Hebb, R.I., Dulieu-Barton, J.M., Worden, K. and Tatum, P. (2010) Towards the derivation of stress intensity factors by parametric modelling of full-field thermoelastic data. Dulieu-Barton, J.M. and Mines, R.A.W. (eds.) In Advances in Experimental Mechanics VII. vol. 24-25, Trans Tech. pp. 227-232 . (In Press) (doi:10.4028/www.scientific.net/AMM.24-25.227).

Record type: Conference or Workshop Item (Paper)

Abstract

Thermoelastic Stress Analysis (TSA) is a well-established full-field technique for
experimental stress analysis that has proved to be extremely effective for studying stress fields in
the vicinity of cracks. Recently, work has focused on the observation that the stress-sum contours
(isopachics) obtained from TSA take the form of a cardioid. Genetic Algorithms (GAs) and
Differential Evolution (DE) have proved successful for accurate parameter estimation of the
cardioids, thus allowing the SIFs to be calculated. Originally, some curve-fits indicated that a pure
cardioid form is inappropriate for the base model, especially for mixed-mode cracks. The deviation
from the cardioid form has been shown to be due to higher-order terms within the stress function.
The objective of the current paper is to use a modified version of the original methodology (that
fitted parameters to a single isopachic) to find the higher-order parameters from the entire data field
obtained from the TSA.

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Accepted/In Press date: 2010
Venue - Dates: 7th BSSM International Conference on Advances in Experimental Mechanics, United Kingdom, 2009-09-07 - 2009-09-09
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 158775
URI: http://eprints.soton.ac.uk/id/eprint/158775
ISBN: 0-87849-248-8
ISSN: 0309-3247
PURE UUID: 00e0d77a-febd-4919-942b-9a0579387686

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Date deposited: 24 Jun 2010 07:36
Last modified: 19 Jul 2019 23:18

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Contributors

Author: R.I. Hebb
Author: K. Worden
Author: P. Tatum
Editor: J.M. Dulieu-Barton
Editor: R.A.W. Mines

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