Accession Number : ADD014572

Title :   Eddy Current Method to Measure Distance between Scanned Surface and a Subsurface Defect.

Descriptive Note : Patent, Filed 9 Jan 89, patented 8 May 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Vernon, Susan N ; Gammell, Paul M

Report Date : 08 May 1990

Pagination or Media Count : 10

Abstract : This invention relates to a method for nondestructive inspection (NDI) of composite materials comprising conductive fibers. The depth of broken fiber damage in nonmetal matrix composites such as graphite/epoxy and carbon/carbon materials may be ascertained and eddy current inspection is extended to include thick metal sections by this method. Inspection is possible with access limited to a single surface. Keywords: Patents, PAT-CL-32A-237. (jes)

Descriptors :   *COMPOSITE MATERIALS, *SUBSURFACE, CONDUCTIVITY, DAMAGE, EDDY CURRENTS, FIBERS, INSPECTION, MATRIX MATERIALS, MEASUREMENT, METALS, NONDESTRUCTIVE TESTING, NONMETALS, PATENTS, RANGE(DISTANCE), SCANNING, SURFACES, THICKNESS

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE