Accession Number : ADA119402

Title :   The Ultrasonic Detection of Unbond in Deep Layers of Multilayered Composites.

Descriptive Note : Final rept. 15 Jul 81-31 Mar 82,

Corporate Author : NAVAL SURFACE WEAPONS CENTER SILVER SPRING MD

Personal Author(s) : Youshaw,Robert A ; Warren,Jeffrey M

PDF Url : ADA119402

Report Date : 10 May 1982

Pagination or Media Count : 30

Abstract : The through transmission ultrasonic method was applied to the problem of detecting unbond in deep layers of multilayer composites. A casting containing severe internal defects was used for the base metal. A range of thickness and non-parallel surfaces were considered. Using the decibel scale, the casting was characterized on a one inch grid. From the difference between this and subsequent measurements as layers were applied, it was possible to distinguish between bond and unbond on layers well beneath the surface.

Descriptors :   *Composite materials, *Ultrasonics, *Detection, Bonding, Nondestructive testing, Castings, Thickness, Layers, Defects(Materials)

Subject Categories : Laminates and Composite Materials
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE