Accession Number:

AD0681578

Title:

AN INVESTIGATION OF THE ELASTIC CHARACTERISTICS OF FIBERGLASS REINFORCED PLASTICS BY THE PULSE ACOUSTIC METHOD,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1968-05-23

Pagination or Media Count:

27.0

Abstract:

A method of determining the dynamic elastic properties of fiberglasses using pulsed ultrasound is described. The method is based on measuring the propagation time of an elastic ultrasonic pulse through the material. Conventional ultrasonic equipment is used. The theoretical basis for determining the elastic characteristics of orthotropic fiberglasses by this method is formulated. Experimental tests were carried out using sheet fiberglass fabricated by the Leningrad plant for laminated plastics. The dynamic and static elastic properties are tabulated and plotted. It is concluded that the ultrasonic pulse method is reliable in determining the elastic properties and in controlling the quality of polymer materials. The elastic properties determined by the pulse method reflect the true elastic relationships between the structural elements of polymer materials. The transition coefficients can be used to evaluate the nonelastic properties of fiberglasses and of other polymer materials. The acoustic parameters and the dynamic elastic constants of orthotropic fiberglasses are accurately described by the stress-strain equations from the theory of elasticity for the anisotropic body. Author

Subject Categories:

  • Refractory Fibers
  • Laminates and Composite Materials
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE