Accession Number : ADA302918

Title :   Ultrasonic Determination of the Elastic Constants of the Stiffness Matrix for Unidirectional Fiberglass Epoxy Composites.

Descriptive Note : Final contract rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Marques, Elizabeth R. ; Williams, James H., Jr

PDF Url : ADA302918

Report Date : DEC 1986

Pagination or Media Count : 27

Abstract : 2727The elastic constants of a fiberglass epoxy unidirectional composite are determined by measuring the phase velocities of longitudinal and shear stress waves via the through transmission ultrasonic technique. The waves introduced into the composite specimens were generated by piezoceramic transducers. Geometric lengths and the times required to travel those lengths were used to calculate the phase velocities. The model of the transversely isotropic medium was adopted to relate the velocities and elastic constants.

Descriptors :   *FIBERGLASS, *STIFFNESS, *ELASTIC PROPERTIES, *CERAMIC MATERIALS, *ULTRASONICS, *CONSTANTS, *EPOXY COMPOSITES, *UNIDIRECTIONAL, *PHASE VELOCITY, SHEAR PROPERTIES, TRANSMITTANCE, SHEAR STRESSES, PIEZOELECTRIC MATERIALS, GEOMETRY, TRANSDUCERS, DETERMINATION, ELASTIC WAVES.

Subject Categories : Ceramics, Refractories and Glass
      Laminates and Composite Materials
      Acoustics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE