Thermoelastic stress analysis under nonadiabatic conditions |
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Authors: | S Offermann J L Beaudoin C Bissieux H Frick |
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Institution: | (1) Laboratoire d'Energétique et d'Optique, Université de Reims Champagne-Ardenne, Moulin de la Housse, B.P. 1039, F-51687 Reims Cedex 2, France;(2) Hochschule für Technik und Wirtschaft der Saarlandes, Goebenstr. 40, D-66117 Saarbrücken, Germany |
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Abstract: | Thermoelastic stress analysis is a full-field stress measurement technique complementary to local techniques like strain gages.
Generally, the heat transfer inside the material is neglected with respect to the frequency of the cyclical loading. An adiabaticity
criterion is established to assert this simplification as a function of the thermal diffusion length and the spatial stress
gradients. Under nonadiabatic conditions, heat diffusion attenuates the spatial temperature gradients, which leads to an underestimation
of stress concentrations. Analytical and numerical considerations allow for the quantification of the spatial resolution.
Finally, several inverse techniques can restore the thermally attenuated contrasts. |
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Keywords: | Fatigue mechanical stress thermoelastic effect infrared thermography |
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