AN EXPERIMENTAL DETERMINATION OF ULTRASONIC WAVE VELOCITIES IN PLASTICS AS FUNCTIONS OF TEMPERATURE

A simple and practical apparatus was set up to measure longitudinal ultrasonic wave velocities. The method used to determine velocity is based on measuring the times required for ultrasonic pulses to travel through samples of different lengths. The method is capable of measuring velocities through s...

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Bibliographische Detailangaben
1. Verfasser:	Arnold, Ned D
Format:	Report
Sprache:	eng
Schlagworte:	ACOUSTIC VELOCITY ACRYLIC RESINS EXPERIMENTAL DATA GLASS TEXTILES HALOCARBON PLASTICS LENGTH MATERIALS MEASUREMENT NOSE CONES NYLON PHENOLIC PLASTICS Plastics POLYETHYLENE PLASTICS PULSES REENTRY VEHICLES ROOM TEMPERATURE SAMPLING SPACE(ROOM) TEMPERATURE ULTRASONIC PROPERTIES ULTRASONIC RADIATION ULTRASONICS VELOCITY WAVES
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Beschreibung
Zusammenfassung:	A simple and practical apparatus was set up to measure longitudinal ultrasonic wave velocities. The method used to determine velocity is based on measuring the times required for ultrasonic pulses to travel through samples of different lengths. The method is capable of measuring velocities through samples of a few millimeters thickness with no more than 4% error. The velocities of longitudinal waves through several plastics have been determined over a range of temperatures that, in general, extended from room temperature up to 100C. Five of the materials studied were common plastics for which velocitytemperature curves are given. The other plastics investigated were special-purpose materials used in the nose cones of ballistic re-entry vehicles. Velocity data for these materials is given. Supported by the Air Force Weapons Lab., Kirtland AFB, NM.