Abstract by Kaylee Rellaford
Chemistry and Biochemistry
Optical Characterization of Stressed Aerospace Grade Aluminum
When stress is applied to a material, one possible outcome is failure. Therefore, the characterization of the effects of stress on materials is a field of inherent interest. Nondestructive evaluation (NDE) methods have been developed to prevent major structural failures. Current NDE methods have several limitations such as expense and the need for highly-trained operators. We have proposed an optical technique, second harmonic generation (SHG), which could eliminate some of these limitations. In optical SHG, input light of a single wavelength converts to produce a SHG response at half the wavelength after interaction with the sample surface. In our work, we measure the SHG response before and after mechanical stress on 2024 series aluminum samples. We monitored the SHG change of 2024 samples after the application of varying tensile loads. We found the SHG response decreases with increasing deformation. These results suggest that we have a promising new method that could complement current nondestructive evaluation.