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Physical Chemistry Seminar
April 19 @ 4:10 pm - 5:00 pm
Vitaliy Goncharov (Guo Group)
Resonant Ultrasound Spectroscopy: Theory and Application
Resonant ultrasound spectroscopy (RUS) is a nondestructive technique for determining elastic properties of metals, alloys, composites, ceramics, and minerals. RUS utilizes ultrasound excitations to probe the samples’ natural frequencies from 0 to 2 MHz. These frequencies are then analyzed to determine the samples’ elastic properties. Elastic moduli such as Young’s modulus, bulk modulus, shear modulus, and Poisson’s ratio can be accurately determined. These moduli are related to fundamental thermodynamic and mechanical properties of a material and describe the response of a material to different types of loading and impact stress. Accurate descriptions of these elastic moduli are thus of great importance to structural and material engineering. Furthermore, the elastic tensor can be defined as a second derivative of Helmholtz free energy in respect to strain. This relationship can be used to study thermodynamic parameters during phase transitions.