The thermoelastic response obtained from an infra-red (IR) detector contains two<br/>components: the magnitude of the small stress induced temperature change caused by the<br/>thermoelastic effect and the phase angle of the temperature change relative to a reference signal<br/>generated by an application of a stress change. The phase angle is related to nonlinearity in the<br/>thermoelastic response and departures from the simple linear relationship that underpins<br/>thermoelastic stress analysis (TSA). The phase data could be used to make an assessment of<br/>temperature evolutions caused by viscoelastic behaviour resulting from damage and provide a basis<br/>for its evaluation. In the current paper the physics of other infra-red techniques used for nondestructive<br/>evaluation is used to better understand the nature of the thermoelastic response. The<br/>objective is to provide better exploitation of TSA by alternative processing of the IR measurements.<br/>Three case studies are presented that demonstrate the potential of the alternative processing for<br/>evaluating damage
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