HEATING OF SOLID RODS BY ULTRASOUND.
NAVAL WEAPONS CENTER CHINA LAKE CALIF
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Heating of rod-shaped materials by high-intensity ultrasound at 20 kHz is described. Results are presented as time-sequenced temperature profiles along a line parallel to the axis of the rod. The heat absorbed by the rod is calculated from these profiles and leads to a measure of the coupling efficiency. Temperature measurements are accomplished by infrared means and range from 250C--600C for steel, 50C--350C for aluminum, and 25C--50C for plastic. Regions of sonic stress are observed in plastic by employment of the principle of photoelasticity and show the coincidence of maximum stress with maximum temperature. Author
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