Composites Optimization and Analysis in
Space Launch Vehicles: United Launch Alliance
(ULA) Utilizes Free Size Optimization for a Doubler
Repair of a Gouge Type Defect
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eVeNt desCRiPtioN:
Doublers are commonly used in launch vehicles to repair composite sandwich facesheet defects,
such as gouges or depressions, because they locally increase the strength of the facesheet in the
area of the repair. Although doublers can be of a diferent material than the facesheets, they
ofen have comparable strength and stifness. Terefore, the doubler's infuence on the overall
extensional and bending stifness of the sandwich can be signifcant. ULA explored the use of
OptiStruct, HyperWorks' structural optimization and analysis solver, to optimize the size and
shape of a composite doubler to minimize the stresses.
PaRtiCiPaNts will leaRN:
• Concept design synthesis for composites
• Modeling and analysis of laminated structures
• Size & shape optimization of composite sandwich structures
PReseNteR's Bio:
Tim Harrell is a structural analyst at United Launch Alliance. He received his degree from Ten-
nessee Tech University in Civil Engineering with an emphasis on Structural Mechanics. At ULA,
the majority of time has been spent working on analyzing non-conformances on both the Atlas
and Delta launch vehicles to determine if they still are structurally sound.
Dr. Robert Yancey is Vice President—Aerospace Solutions for Altair where he focuses on
developing and delivering innovative simulation and design based solutions. Troughout
his academic and professional career he has been involved with the characterization, design
optimization, and analysis of composites in a variety of industries. He holds degrees from MIT,
Virginia Tech, and the University of Dayton and has been with Altair since 1999.
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date aNd time:
May 27, 2014
2:00 PM EST
PReseNteRs
Tim Harrell
Structural Engineer
United Launch Alliance
Robert Yancey
VP Aerospace Solutions
Altair
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