Abstract by Kaylee Rellaford
Chemistry and Biochemistry
Optical Characterization of Stressed Aluminum
Nondestructive testing (NDT) methods have been developed to prevent major structural failures. We have proposed an optical technique, second harmonic generation (SHG), as a NDT method to detect mechanical stress in aluminum. In optical SHG, an input light produces light at half the wavelength. With SHG, the surface of aerospace grade aluminum samples can be investigated. In our work, we measured the SHG response before the sample is stressed and then used a one-armed strength tester to apply set extensions. After the sample was mechanically stressed, we again measured the SHG response. We compared the change in SHG response, which showed decreasing signal as extension length increased. These results showed that we have a promising new method for nondestructive testing.