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Experimental determination of ultrasonic wave velocities in plastics as functions of temperature. I. Common plastics and selected nose‐cone materials
Author(s) -
Arnold Ned D.,
Guenther Arthur H.
Publication year - 1966
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1966.070100506
Subject(s) - materials science , composite material , ultrasonic sensor , nylon 6 , polyethylene , atmospheric temperature range , glass fiber , fiber , polymer , acoustics , thermodynamics , physics
An experimental study was conducted to determine previously unavailable data showing the relationship between temperature and the velocity of longitudinal ultrasonic waves through several plastics. The ultrasonic frequencies used were between 1 and 10 Mc./sec., and the temperature range covered was between room temperature and 100°C. Velocity–temperature curves were determined for nylon, a high‐ and a low‐density polyethylene, Plexiglas, Teflon, and for several reentry vehicle nose‐cone materials, including chopped nylon phenolic, tape‐wound nylon phenolic, Castable 124, Avcoat I, and Avcoat 19. Less complete data were obtained for Avco phenolic fiber glass, General Electric phenolic fiber glass, and oblique tape‐wound refrasil. These layered materials are difficult to measure, and the velocity of acoustic waves is very dependent on the direction of propagation with respect to the laminations. For most of the materials studied the velocity was found to decrease more or less linearly with increasing temperature. Typically, the velocities at 100°C. were 9–31% less than at room temperature.