Accession Number : ADA226516

Title :   Superplastic Formed Aluminum-Lithium Aircraft Structures.

Descriptive Note : Final rept. May 88-Jul 89,

Corporate Author : ROCKWELL INTERNATIONAL LOS ANGELES CA

Personal Author(s) : Anton, C. E. ; Martin, G. R.

Report Date : JUN 1990

Pagination or Media Count : 396

Abstract : This final report contains the results of Phase II of this two phase program which is primarily concerned with technology demonstration. The report begins with the submission of three advanced SPF designs; a floor support beam, keelson shear panel and a forward fuselage bulkhead. A detailed Weight and Life Cycle cost (LCC) trade study was done on each of these. The LCC study showed a cost savings of $14.8 million for the floor support beam, a $5.01 million savings for the keelson shear panel and a $7.8 million cost increase for the forward bulkhead (this was attributed to design complexity). The weight savings study showed a weight savings for the floor support beam and keelson shear panel (7.05 lbs and 2.57 lbs) and a weight penalty of 3.85 lbs for the forward bulkhead. The durability and damage tolerance analysis of the floor support beam resulted in a durability life of 63,650 cycles and a damage tolerant life of 34,000 cycles. Strength data results from the solution heat treatment optimization confirmed that longer solution heat treatment intervals did not increase the strength properties of the 8091 A1-Li material. (js)

Descriptors :   *ALUMINUM, *BULKHEADS, *LITHIUM, AIRCRAFT, AIRFRAMES, BEAMS(STRUCTURAL), COMMERCE, COSTS, DAMAGE, DAMAGE ASSESSMENT, DEMONSTRATIONS, FLOORS, FORWARD AREAS, FUSELAGES, LIFE CYCLE COSTS, OPTIMIZATION, SOLUTION HEAT TREATMENT, STRENGTH(GENERAL), STRENGTH(MECHANICS), TOLERANCE, WEIGHT REDUCTION.

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE