Fabrication of structural components from commercial aluminum alloys using superplastic formingSPF technology was used to fabricate structural components from the 7475 Al and 8090 Al-Li commercial alloys. Gas-pressurization cycles were established for SPF three-hat stiffener configurations on the basis of uniaxial data and component-geometry considerations. It is established that higher forming rates than the optimum strain rates selected from the uniaxial data for each alloy could be used in the later stages of forming without reducing SPF components' dimensional conformity. Cavitation was precluded through the use of back pressure during forming.
Document ID
19910064288
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hales, S. J. (Analytical Services and Materials, Inc. Hampton, VA, United States)
Bales, T. T. (Analytical Services and Materials, Inc. Hampton, VA, United States)
Shinn, J. M. (NASA Langley Research Center Hampton, VA, United States)
James, W. F. (Lockheed Engineering and Sciences Co. Hampton, VA, United States)