Doctor of Philosophy (Ph.D.)
We present a thermoelastic derivation of ultrasonic waves propagating in a solid in which an applied homogeneous stress is superimposed on a nonzero initial stress. We also derive the temperature dependence of the elastic coefficients and the linear relationship between the applied stress and a newly defined parameter--the thermal acoustic constant. The stress acoustic constant is defined and its relationship to the acoustic natural velocity is discussed. Experimental considerations pertinent to the ultrasonic measurement techniques used in the investigation are described. The results of the stress-strain and thermal strain experiments verify the predictions of the theory. Finally, we derive an improved formula for correcting the effects of the transducer and the transducer bonding material in ultrasonic standing wave phase velocity measurements. The results are verified by computer models and laboratory experiments.
© The Author
Chern, Engmin J., "Ultrasonic determination of thermoelastic properties of stressed solids" (1981). Dissertations, Theses, and Masters Projects. Paper 1539623724.