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Measurement of High Temperature Anisotropic Elastic Constants of Zr-2.5Nb Pressure Tube Materials by Resonant Ultrasound Spectroscopy  

Cheong, Yong-Moo (Nuclear Materials Technology Team, Korea Atomic Energy Research Institute)
Kim, Sung-Soo (Nuclear Materials Technology Team, Korea Atomic Energy Research Institute)
Kim, Young-Suk (Nuclear Materials Technology Team, Korea Atomic Energy Research Institute)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.22, no.2, 2002 , pp. 140-148 More about this Journal
Abstract
Anisotropic elastic constants of Zr-2.5Nb pressure tube materials were determined by a high temperature resonant ultrasound spectroscopy (RUS). The resonant frequencies were measured using alumina wave-guides and wide band ultrasonic transducers in a small furnace. The rectangular parallelepiped specimens were fabricated along with the axial, radial and circumferential direction of the pressure tube. A nine elastic stiffness tensor for orthotropic symmetry was determined in the range of room temperature ${\sim}500^{\circ}C$. As the temperature increases, the elastic constant tensor, cij gradually decreases. Higher elastic constants along the transverse direction compared to those along the axial or radial direction are similar to the case of Young's modulus or shear modulus. A crossing of shear elastic constants along axial direction and radial direction was observed near $150^{\circ}C$. This fact corresponds to the crossing of c44 and c66 of single crystal zirconium.
Keywords
resonant ultrasound spectroscopy (RUS); anisotropic elastic constants; zirconium alloy;
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