## 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.

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.

Original language | English |
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Title of host publication | Advances in Experimental Mechanics VII |

Editors | J.M. Dulieu-Barton, R.A.W. Mines |

Publisher | Trans Tech Publications Inc |

Pages | 227-232 |

Number of pages | 6 |

Volume | 24-25 |

Publication status | Published - 2010 |