Accession Number:

AD0827596

Title:

ULTRASONIC AND THERMAL STUDIES OF SELECTED PLASTICS, LAMINATED MATERIALS, AND METALS

Descriptive Note:

Technical rept. Sep 1965-Jun 1967

Corporate Author:

ALBUQUERQUE UNIV NM

Report Date:

1968-01-01

Pagination or Media Count:

271.0

Abstract:

Ultrasonic and thermal investigations of several common plastics, nose cone materials, and alloys are presented. The ultrasonic data consist of measurements of the acoustic shear and longitudinal velocities in the frequency range of 1 to 10 MHz and as a function of temperature to approximately 125 deg C for most of the plastics and to approximately equals 250 deg C for most of the alloys. Some information is presented regarding the dependence of acoustic velocities on uniaxial stress in two aluminum alloys. The temperature dependent ultrasonic data are used to calculate the temperature dependence of the elastic moduli for the materials studied. The thermal analyses describe a differential thermal technique DTA used to study the phase transitions and chemical transformations of the reported materials. This approach was used to measure the linear coefficient of expansion and the specific heat at constant pressure over a temperature range of approximately equals -100 to 200 deg C for the expansion characteristics, and approximately equals -100 to 700 deg C for the specific heat measurements. In addition, heats of fusion are reported. In some cases, the thermal behavior of the reported materials is listed to approximately 1200 deg C. The thermal and ultrasonic data are combined to calculate the Gruneisen ratio as a function of temperature. The application of ultrasonic and thermal investigations to the determination of the equation of state of solids is also presented. The present study shows that such applications are of significant importance to high pressure equation-of-state determinations.

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE