Nondestructive Detection and Characterization of Corrosion in Aircraft.
Final rept. 1 Jul 93-30 Sep 96,
IOWA STATE UNIV AMES CENTER FOR NONDESTRUCTIVE EVALUATION
Pagination or Media Count:
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.
- Properties of Metals and Alloys
- Test Facilities, Equipment and Methods