ULTRASONIC WAVE VELOCITY - TEMPERATURE STUDIES IN SEVERAL PLASTICS, PLASTIC FOAMS AND NOSE-CONE MATERIALS
Abstract
An experimental study was conducted to (1) show the relationship between temperature and velocity of longitudinal ultrasonic waves through several plastics and nose-cone materials and (2) establish a convenient apparatus for the determination of elastic properties of materials. The velocity-temperature data were needed for use in another project where certain inputs were necessary to more completely describe materials under shock-loaded conditions. The experimental procedure was based on measuring the transit times required for ultrasonic waves in the low-megacycle range to pass through samples of different thicknesses. The resulting accuracy for most of the measurements is within about 1 to 2%. The temperature range of the measurements extended between room temperature and about 125 C, with a few measurements to 250 C. Velocity- temperature curves were determined for nylon, low- and high-density polyethylene, plexiglass (polymethylmethacrylate), Delrin Acetal, teflon. Curves were also drawn for several re-entry vehicle nose-cone materials, including chopped nylon phenolic, Castable 124, Avcoat I and 19, pyrolytic graphite, Phenolic Fibre Glass, Phenolic Carbon, Tape Wound Nylon Phenolic, Rad 58B, Rad 60, and some solid epoxy foams.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1966
- Accession Number
- AD0481174
Entities
People
- Anton J. Dorr
- Arthur H. Guenther
- James R. Asay
- Ned D. Arnold
Organizations
- Air Force Research Laboratory