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Thermographic Characterization of the Material Microstructure Using Dissipative Effects

: Rösner, H.; Meyendorf, N.; Sathish, S.

AMA Service GmbH, Wunstorf:
6th Conference and Exhibition on Infrared Sensors and Systems 2000. Proceedings
Wunstorf, 2000
Conference and Exhibition on Infrared Sensors and Systems (IRS2) <6, 2000, Erfurt>
Fraunhofer IZFP ()
Thermographik; material; microstructure; aerospace; fatigue

The cyclic mechanical loading of a test specimen leads to a periodic variation of the surface temperature due to the thermoelastic effect. Additionally, the temperature of the specimen increases due to dissipative effects. Since this dissipation depends upon the microstructure of the material in a characteristic manner, thermographic measurements performed during mechanical cyclic loading allow determination of the materials state, wich depend upon already endured fatigue load of the material. If the material is loaded with high power ultrasound then a nondestructive characterization of fatigue state and an estimation of the remaining lifetime are possible. The paper presents results of thermographic characterization of fatigue in titanium alloys that are typical aerospace materials.