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In TSA the thermoelastic temperature change in the surface of cyclically loaded  materials is measured, which is for isotropic materials proportional to the  change of the sum of the principal stresses. The sensitivity of the infrared  sensors used in TSA is related non-linearly with the absolute temperature. This  can be effectively corrected by a direct calibration of the thermal signal, if  this is not done by the supplier of the measurement system. The injection  moulded PA6 GF 30 has layer-wise changing mechanical and thermoelastic  properties. Therefore is a strain oriented approach used to calibrate the  thermoelastic signal, the measured thermoelastic signal can be directly related  to the sum of the principal strains. In a load increase test the thermoelastic  signal increases proportional to the applied load up to a certain load-level.  Beyond this load, the thermoelastic signal S increases disproportionately high  compared to the applied load. The increase of the thermoelastic signal is caused  by the beginning disruption of the material, what is confirmed by measuring the  acoustic emission. Single-load fatigue measurements are done, indicating that  the maximum applicable load under cyclic loading conditions could be determined  from the thermoelastic signal

Identification of the critical load for cyclic loading of shortfibre reinforced PA6 GF30 by a quantitative analysis of the thermoelastic response