Abstract (eng)
Resonant ultrasound spectroscopy (RUS) is a widely used technique in order to determine elastic constants of various materials. Major advantages of this method are the determination of the complete elastic tensor from just one spectrum of measured eigenfrequencies and the performance of experiments at high temperatures. The calculation of the samples eigenfrequencies and a subsequent comparison with measured frequencies provide the possibility to extract elastic constants from the RUS spectrum. Today, due to computers with high computational capacity, various shapes and symmetries of a sample can be evaluated. Since elastic constants are needed for the calculation of the eigenfrequencies, RUS is a powerful method provided that the elastic constants are already known to a certain degree. However, for a material with completely unknown elastic properties, a different method needs to be used in advance. The development of a new measuring device together with a furnace for high temperature measurements was one of the goals of this master thesis. Additionally, the elastic constants, i.e. Young's modulus, shear modulus and Poisson's ratio of various samples were determined as a function of temperature.