Accession Number : ADA331089

Title :   Topographic Radioscopic Metrology for Corrosion Mapping.

Descriptive Note : Conference proceedings.

Corporate Author : WRIGHT LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Brausch, John C.

PDF Url : ADA331089

Report Date : 23 JUN 1994

Pagination or Media Count : 14

Abstract : Corrosion of aging aircraft is a pivotal concern in today's Air Force as large transport and tanker aircraft are utilized well beyond their intended design life. The C/KC-135 aircraft, built in the late 1950's and early 1960's is currently projected for service through the year 2040. For such geriatric aircraft, corrosion is often the life limiting factor. Inspection for lap-joint corrosion on the C/KC-135 during depot maintenance has historically been conducted in a quasi-destructive manner. Typically, maintenance Personnel inspect fastener lines for visual indications of corrosion i.e. blistering paint, corrosion products, and skin pillowing. If a suspect region is located, the fasteners are removed and a section of the skin lap-seam is peeled open for an invasive inspection. This method is both inefficient and costly. The Aging Aircraft Disassembly and Hidden Corrosion Detection Program, conducted at the Oklahoma City Air Logistics Center (OC-ALC) is attempting to identify off the-shelf nondestructive inspection (NDI) equipment and technologies that can accurately detect and quantify corrosion in fuselage lap-joint structures of the C/KC-135 and E-3 aircraft. OC-ALC requested that the materials Directorate of Wright Laboratory develop a laboratory meterological tool by which the corrosion on disassembled aircraft fuselage skins can be accurately measured and mapped. This tool would be used to produce the solution set by which the vendor 'round-robin' inspections would be graded. The resulting technique, Topographic Radioscopic Metrology (TRM), exploits the calibrated gray scale of a digitized radioscopic image through image processing. The resulting 'corrosion maps' supply a topographical quantification of material loss due to corrosion.

Descriptors :   *SYMPOSIA, *X RAY DIFFRACTION, MAINTENANCE, IMAGE PROCESSING, AGING(MATERIALS), CORROSION, NONDESTRUCTIVE TESTING, TOPOGRAPHY, FUSELAGES, TANKER AIRCRAFT, METROLOGY.

Subject Categories : Properties of Metals and Alloys
      Transport Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE