Accession Number : AD0438893


Title :   INVESTIGATION OF EDDY CURRENT TECHNIQUES IN ANALYZING AIRCRAFT STRUCTURES FOR FATIGUE DAMAGE.


Descriptive Note : Rept. for 12 Sep 63-31 Mar 64,


Corporate Author : OKLAHOMA UNIV RESEARCH INST NORMAN


Personal Author(s) : Sims,E M


Report Date : 28 Apr 1964


Pagination or Media Count : 54


Abstract : The primary objective of the program was to develop nondestructive methods of evaluating aircraft structures of aluminum alloys for fatigue damage. The approach to the problem was primarily through the use of eddy current instrumentation. Flat plate and sheet aluminum alloys, of types 7075-T6, 6061-T6, and 2024-T3, were supplied by OCAMA for the test program. Specimens were reverse stress cycled to varying degrees of damage and inspected with eddy current instrumentation. These were then pulled to rupture to correlate eddy current response to reduction in strength and ductility. (Author)


Descriptors :   *AIRCRAFT , *STRUCTURES , *ALUMINUM ALLOYS , NONDESTRUCTIVE TESTING , FATIGUE(MECHANICS) , FATIGUE(MECHANICS) , INSTRUMENTATION , RUPTURE , FRACTURE(MECHANICS) , METAL PLATES , SHEETS , ELECTRIC CURRENT , MAGNETIC FIELDS , LOADS(FORCES) , VIBRATION , STEEL , DAMAGE , DETECTION , FRACTOGRAPHY , PHOTOMICROGRAPHY , DYES , PENETRATION , TABLES(DATA)


Distribution Statement : APPROVED FOR PUBLIC RELEASE