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Aerostructures Branch
NASA Dryden Flight Research Center, Edwards, California
Biography (From NASA Tech Briefs, 1 August, 2010):
Dr. William Ko joined NASA’s Dryden Flight Research Center in 1977 after receiving a PhD in aeronautics from California Institute of Technology and conducting research at Southwest Research Institute in San Antonio, Texas. An accomplished scientist and inventor, he is credited with developing a number of mathematical theories critical to advancing the state-of-the-art in aerospace structural mechanics including the Blatz-Ko Constitutive Law for hyper-elastic materials, the Ko Flight Structure Aging Theory for fatigue life predictions, and the Ko Displacement Theory for structural shape predictions. The Ko Displacement Theory is currently being used at NASA Dryden to develop sophisticated fiber optic shape sensing technology that could one day give aircraft wings the ability to alter their shape in flight.
Selected Publications:
Ko, W. L., “Elastic Stability of Superplastically Formed/Diffusion Bonded Orthogonally Corrugated Core Sandwich Plates,” AIAA 80-0683, presented at the AIAA/ASME/ASCE/AHS/AHC 21st Structures, Structural Dynamics, and Materials Conference, Seattle, WA, May 12–14, 1980.
William L. Ko, “Accuracies of Southwell and Force/Stiffness Methods in the Prediction of Buckling Strength of Hypersonic Aircraft Wing Tubular Panels”, NASA Technical Memorandum 88295, November 1987
Ko, William L. and Raymond H. Jackson, “Compressive Buckling Analysis of Hat-Stiffened Panel”, NASA TM-4310, Aug. 1991.
Ko, William L. and Raymond H. Jackson, Combined-Load Buckling Behavior of Metal-Matrix Composite Sandwich Panels Under Different Thermal Environments, NASA TM-4321, 1991.
Ko, William L. and Raymond H. Jackson, Thermal Behavior of a Titanium Honeycomb-Core Sandwich Panel, NASA TM-101732, 1991.
Ko, William L. and Raymond H. Jackson, “Combined Compressive and Shear Buckling Analysis of Hypersonic Aircraft Structural Sandwich Panels,” AIAA Paper No. 92-2487-CP. Presented at the 33rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, Dallas, Texas, April 13–15, 1992; also NASA TM-4290, 1991.
Ko, William L., “Mechanical and Thermal Buckling Analysis of Sandwich Panels Under Different Edge Conditions,” Proc. 1st Pacific International Conference on Aerospace Science and Technology, Tainan, Taiwan, Dec. 6–9, 1993
Ko, William L. and Raymond H. Jackson, “Compressive and Shear Buckling Analysis of Metal Matrix Composite Sandwich Panels under Different Thermal Environments,” Composite Structures, Vol. 25, July 1993, pp. 227–239.
Ko, William L. and Raymond H. Jackson, Mechanical and Thermal Buckling of Rectangular Sandwich Panels Under Different Edge Conditions, NASA TM-4585, 1994.
William L. Ko and Raymond H. Jackson (Dryden Flight Research Center, Edwards, California), “Shear buckling analysis of a hat-stiffened panel”, NASA Technical Memorandum 4644, November 1994
William L. Ko "Thermocryogenic Buckling and Stress Analysis of a Partially Filled Cryogenic Tank Subjected to Cylindrical Strip Heating" National Aeronautics and Space Administration Office of Management Scientific and Technical Information Program, 1994.
William L. Ko, “Thermocryogenic buckling and stress analyses of a partially filled cryogenic tank”, in Aerospace thermal structures and materials for a new era, edited by Earl Arthur Thornton, 1995, AIAA, ISBN 1-56347-182-5
Ko, W.: Mechanical and thermal buckling behavior of rectangular plates with different central cutouts. NASA TM 206542, March (1998)
William L. Ko, “Anomalous buckling characteristics of laminated metal-matrix composite plates with central square holes”, NASA technical paper 1998-206559, July 1998
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