Accession Number : ADA266350


Title :   Role of Microstructure on Fatigue Durability of Aluminum Aircraft Alloys


Descriptive Note : Interim status rept.


Corporate Author : ALUMINUM CO OF AMERICA ALCOA CENTER PA ALCOA TECHNICAL CENTER


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266350.pdf


Report Date : 09 Mar 1993


Pagination or Media Count : 26


Abstract : Alcoa historical 7050 fatigue test data has been assembled and reviewed. The range of microstructures examined in the program has been expanded from two in the contract proposal to five. In addition to the old and new quality thick plate, the program includes low porosity thick plate, low particle thick plate, and thin plate. These materials provide a range of microstructures/ fatigue failure modes to help understand and model early stage fatigue damage. Through the scope of the program has expanded, the total program cost to the Navy has not changed. The fatigue test data on additional microstructural variants of 7050 have been assembled. Fractography of failed coupon specimens has been completed. The microstructural features controlling fatigue initiation have been identified. Samples of old and new quality plate have been supplied to the UCLA team in support of their ONR program.


Descriptors :   *MICROSTRUCTURE , *FATIGUE(MECHANICS) , *AIRCRAFT PANELS , THERMOMECHANICS , ALUMINUM ALLOYS , DEFORMATION , LITHIUM ALLOYS , METAL PLATES , POROSITY , STRUCTURAL PROPERTIES , COMPUTERIZED SIMULATION


Subject Categories : Properties of Metals and Alloys


Distribution Statement : APPROVED FOR PUBLIC RELEASE