Measurement of Young’s modulus and damping for hexoloy SG silicon carbide

Abstract

Stiffness and damping are important design parameters for the potential applications of silicon carbide in the aerospace industry. Thus, Young`s modulus values are needed for calculations of stress and strain, and mechanical damping determines the rate at which vibrations are dissipated in the material. In this paper, the measurements of Young`s modulus and mechanical damping of Hexoloy SG silicon carbide at high temperatures are discussed and compared with published values. These measurements were made using the Piezoelectric Ultrasonic Composite Oscillator Technique (PUCOT). The modulus values are important for calculations involving stress and strain for design purposes. The mechanical damping determines the rate at which vibrations are dissipated in the material. The relationship of the mechanical damping to the strain amplitude is discussed. Microstructural analysis and microhardness tests are discussed as well.