Accession Number : ADA275814

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

Descriptive Note : Progress summary rept. Mar-Dec 93,

Corporate Author : ALUMINUM CO OF AMERICA ALCOA CENTER PA

Personal Author(s) : Brockenbrough, J. R. ; Bucci, R. J. ; Hinkle, A. J. ; Magnusen, P. E. ; Miyasato, S. M.

Report Date : 29 DEC 1993

Pagination or Media Count : 40

Abstract : The goal of this program is to provide a framework through which metallic alloy development programs and aircraft life assessment methodologies may exploit the potentially significant advantages in performance, weight reduction and cost savings offered by quality improved materials and processes. The key performance attribute studied in this investigation is fatigue durability as identified by cracking which originates from microstructural features and grows to an inspectable dimension of economic consequences (i.e., a crack requiring diagnostic or corrective action during the operational lifetime of a part). Meeting the program objective consists of the following steps: (1) coupling historical material performance data with new data to formulate the opportunity and validate the concept, (2) quantifying the relationship between microstructure and performance, (3) synthesizing and verifying analytical models for predicting statistical fatigue response from microstructure data, and (4) developing test/evaluation protocols to facilitate technology implementation and concept scale-up to quantify payoff potential.

Descriptors :   *AIRCRAFT, *FATIGUE, *MICROSTRUCTURE, COSTS, COUPLINGS, CRACKS, ECONOMICS, ALUMINUM ALLOYS, MATERIALS, MODELS, QUALITY, PERFORMANCE(ENGINEERING), RESPONSE, SAVINGS, SCALE, TEST AND EVALUATION, WEIGHT REDUCTION.

Subject Categories : Metallurgy and Metallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE