Identification of crack-tip parameters using thermoelastic isopachics and differential evolution
Identification of crack-tip parameters using thermoelastic isopachics and differential evolution
A curve-fitting routine based on a Differential Evolution (DE) is used to generate noise-free cardioid curves from thermoelastic data obtained from the neighbourhood of a crack-tip. The technique is benchmarked using simulated thermoelastic data. The generated cardioid curves arc used to determine the stress intensity factors (SIFs) from slois and real cracks loaded in mode 1. The derived SIFs show excellent agreement with theory and confirms the validity of the approach. The curve-fitting approach allows more information to be obtained from the thermoelastic data than previous analysis routines and will provide a basis for further development of thermoelastic stress analysis for application in crack-tip stress studies. A means for evaluating the far field stress term, σ0x, from the generated contours is also described.
thermoelastic stress analysis (TSA), stress intensity factors (SIFs), crack-tip parameters, genetic algorithm (GA), curve-fitting
0-87849-922-9
77-86
Dulieu-Barton, J.M.
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Worden, K.
07522936-fd47-4df2-b75e-c3d297d104b3
2003
Dulieu-Barton, J.M.
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Worden, K.
07522936-fd47-4df2-b75e-c3d297d104b3
Dulieu-Barton, J.M. and Worden, K.
(2003)
Identification of crack-tip parameters using thermoelastic isopachics and differential evolution.
Key Engineering Materials, 245-246, .
Abstract
A curve-fitting routine based on a Differential Evolution (DE) is used to generate noise-free cardioid curves from thermoelastic data obtained from the neighbourhood of a crack-tip. The technique is benchmarked using simulated thermoelastic data. The generated cardioid curves arc used to determine the stress intensity factors (SIFs) from slois and real cracks loaded in mode 1. The derived SIFs show excellent agreement with theory and confirms the validity of the approach. The curve-fitting approach allows more information to be obtained from the thermoelastic data than previous analysis routines and will provide a basis for further development of thermoelastic stress analysis for application in crack-tip stress studies. A means for evaluating the far field stress term, σ0x, from the generated contours is also described.
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Published date: 2003
Keywords:
thermoelastic stress analysis (TSA), stress intensity factors (SIFs), crack-tip parameters, genetic algorithm (GA), curve-fitting
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Local EPrints ID: 22426
URI: http://eprints.soton.ac.uk/id/eprint/22426
ISBN: 0-87849-922-9
ISSN: 1662-9795
PURE UUID: 9c479d5a-351a-4cb8-8f95-cadbb8f2021b
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Date deposited: 24 Mar 2006
Last modified: 08 Jan 2022 12:52
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Author:
K. Worden
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