Accession Number : ADA303567

Title :   The Ultrasonic Inspection of Interlaminar Damage in Composite Materials,

Corporate Author : DELAWARE UNIV NEWARK CENTER FOR COMPOSITE MATERIALS

Personal Author(s) : Yost, Bruce A. ; Pipes, R. B.

PDF Url : ADA303567

Report Date : 10 MAY 1979

Pagination or Media Count : 126

Abstract : Ultrasonic inspection techniques were used to interrogate the internal damage of E glass/epoxy disks (3M - Scotchply 1003) that had been subjected to fatigue loadings and static loadings. Two types of disks were examined; defective disks which contained implanted Teflon defects of various sizes and pristine disks with no implanted defects. The growth of overall damage in each disk, as well as, the growth of individual delaminations were monitored with 'C' scan techniques. The location of each delamination was determined through examination of the reflected waveform; photomicrographs revealed the actual location of each delamination and the two results were compared. Locations of delaminations were adequately determined by the ultrasonic methods. Finally, a finite element model of a pristine disk was developed. The validity of this model was proven through comparison of predicted and observed deflections and radial strains. (MM)

Descriptors :   *COMPOSITE MATERIALS, *LAMINATES, *DAMAGE ASSESSMENT, *ULTRASONICS, MATHEMATICAL MODELS, FIBERGLASS, STRESS ANALYSIS, FINITE ELEMENT ANALYSIS, STIFFNESS, MODULUS OF ELASTICITY, DEFLECTION, THESES, STRAIN(MECHANICS), GLASS, BENDING, REFLECTION, DEFECTS(MATERIALS), FATIGUE(MECHANICS), EPOXY COMPOSITES, ACOUSTIC EMISSIONS, DELAMINATION, ULTRASONIC TESTS, CYCLIC LOADS, POISSON RATIO, TETRAFLUOROETHYLENE RESINS.

Subject Categories : Laminates and Composite Materials
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE