Dr Chauncey Wu, NASA Langley Research Center, Virginia, USA.
Design and Manufacturing of Tow-Steered Composite Shells Using Fiber Placement, And Testing and Analysis of Advanced Composite Tow-Steered Shells.
Advanced composite shells may offer the potential to improve the structural performance of future aircraft fuselage structures. In this talk the design and manufacture of cylindrical shells with tailored, tow-steered layups and continuously varying fiber angle orientations will be discussed. The shells were fabricated from unidirectional IM7/8552 graphite-epoxy pre-preg slit tape material fiber-placed on a constant-diameter mandrel. Each shell had the same nominal 8-ply [±45/±Θ]s layup, where the nominal fiber angle Θ in the tow-steered plies varied continuously from 10 degrees along the crown to 45 degrees on each side, then back to 10 degrees on the keel. One shell was fabricated with all 24 tows placed during each pass of the fiber placement machine, resulting in many tow overlaps on the shell surface. The fiber placement machine’s individual tow cut/restart capability was also used to manufacture a second shell with tow drops and a more uniform laminate thickness. In addition to the design and manufacturing processes for these shells, an overview will be given of issues encountered during their fabrication and post-cure evaluation. Structural testing and analysis of the shells will also be discussed.
ABOUT THE PRESENTER
Chauncey Wu is an Acquisition Manager in the Science Office for Mission Assessments at the NASA Langley Research Center. He started his NASA career as a co-op student in 1985, and graduated from Purdue University with a BS in 1988. He earned a MS from the University of Illinois in 1990, and a PhD from Delft University of Technology in 2006. In addition to several structures research branches, he has also worked on launch vehicle systems analysis and conceptual design. His research interest is the design, analysis, manufacturing and testing of advanced composite tow-steered structures.
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