Accession Number : ADA318667

Title :   Nondestructive Detection and Characterization of Corrosion in Aircraft.

Descriptive Note : Final rept. 1 Jul 93-30 Sep 96,

Corporate Author : IOWA STATE UNIV AMES CENTER FOR NONDESTRUCTIVE EVALUATION

Personal Author(s) : Rose, James H. ; Moulder, John C. ; Gray, Joseph N.

PDF Url : ADA318667

Report Date : NOV 1996

Pagination or Media Count : 9

Abstract : We have developed a fully characterized pulsed eddy current (PEC) instrument to detect and characterize second-layer corrosion in aircraft skin. In the first year, we developed the theory needed to accurately model the response of the PEC instrument measured on a variety of calibration specimens. In the second year, we made experimental measurements on a number of realistic samples including a corrosion test panel provided by Boeing corporation. In addition, inverse methods were developed for estimating the location and amount of hidden corrosion. In the third year, the inversion methods were fully incorporated in the PEC instrument. New methods were developed: (1) for calculating the response due to pitting corrosion; and (2) for removing interfering signals from fasteners and other structures. The experimental effort in the third year focused on technology transfer. The instrument was a highly successful participant in the Air Force blind trials for corrosion detection and characterization.

Descriptors :   *CORROSION, *NONDESTRUCTIVE TESTING, AIRCRAFT, AIR FORCE RESEARCH, CORROSION INHIBITION, BACKSCATTERING, DEFECTS(MATERIALS), FUSELAGES, SKIN(STRUCTURAL), EDDY CURRENTS, X RAY TUBES, PITTING, BREMSSTRAHLUNG.

Subject Categories : Properties of Metals and Alloys
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE