Thermal Shock Damage Assessment in Ceramics Using Ultrasonic Waves

Authors: Meir Hefetz; Stanislav I. Rokhlin

Abstract:

Structural ceramics are susceptible to microcrack damage by thermal shock. There is a critical temperature for thermal shock damage initiation with damage severity increasing at greater shock temperatures. In this work the applicability of an ultrasonic method to determine the critical temperature and the accumulated damage is demonstrated in alumina. Information is obtained via velocity and attenuation measurements using surface and obliquely incident bulk ultrasonic waves. The elastic anisotropy effect due to preferred crack orientation has been estimated. The critical temperatures for the alumina is about 200 degrees C. The damage increases steeply from 200 degrees C to 400 degrees C and grows significantly above 400 degrees C. Changes up to 17% from the original values in the effective shear moduli and up to 45% in the longitudinal effective modulus in the direction transverse to crack orientation are measured at high thermal shock temperatures. (Author).

Pages:	7
Report Date:	JUL 92
Report Number:	D923333
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Thermal Shock Damage Assessment in Ceramics Using Ultrasonic Waves

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