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

By R.I. Hebb, J.M. Dulieu-Barton, K. Worden and P. Tatum

Abstract

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

Topics: TJ
Publisher: Trans Tech
OAI identifier: oai:eprints.soton.ac.uk:158775
Provided by: e-Prints Soton
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