prepared by Structural Mechanics Associates ; principal investigators, M.K. Ravindra, H. Banon ; Science Applications, inc. ; principal investigators, J.T. Gordon, Jr., J.E. Reaugh ; Northwestern University, Department of Civil Engineering ; principal investigators, T. Belytschko, T.E. Abrahamson, Yul-Woong Hyun ; Sandia National Laboratories ; principal investigator, K.W. Schuler ; Massachusetts Institute of Technology, Aeroelastic and Structures Research Laboratory, Department of Aeronautics and Astronautics ; principal investigators, E.A. Witmer, S.E. French