Abstract
Thermoelastic Stress Analysis (TSA) is a full-field technique for experimental stress analysis that has proved to be extremely effective for studying stress fields in the vicinity of crack-tips. An understanding of such fields is vital to the development of effective diagnosis and prognosis algorithms for Non-Destructive Testing (NDT) and Structural Health Monitoring (SHM). The key to crack-tip studies using TSA is the observation that the stress-sum contours (isopachics) in the vicinity of the tip take the form of a simple curve - the cardioid. This was exploited in [1] in order to estimate the Stress Intensity Factors (SIFs) for crack-tips in mode 1 and mixed-mode opening. The analysis [1] 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.
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