from the conferences organized by TANGER Ltd. provisional website
Each metal is characterized by its typical stacking-fault energy (SFE). The higher this energy is, the less often are stacking errors in the crystal lattice. The stacking-fault energy has a large influence on the behavior of the metal during plastic deformation, which is mainly related to the relationship between SFE and the dislocation ability for climbing and lateral slip. The measurement of deformations is usually performed in a uniaxial tension test. In order to determine the deformations in real time, GAMA's ARAMIS system is used, which is non-contact and is independent of the tested material. Its operation involves the use of digital image correlation. An interesting solution seems to be the use of thermovision to measure deformation by analyzing thermographic images during stretching of materials. The aim of the study was a comparative analysis of the results obtained by measuring strains using the ARAMIS system and temperature using a FLIR thermal imaging camera. Samples cut from sheets of aluminium, copper and steel alloys were designated for testing. In the first frame, the most favorable way of preparing the surface of the plates was determined in order to obtain reliable temperature measurements by increasing the emissivity factor. The samples were then stretched. Then a correlation was made between the temperature and the deformation for a given material. The results allow us state that thermovision can be successfully used in the future to measure material deformations.Keywords: Termovision, 3D scanning
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