Research in structures, structural dynamics, and materials, 1989 : work-in-progress and other special presentation papers presented at the AIAA/ASME/ASCE/AHS/ASC 30th Structures, Structural Dynamics, and Materials Conference held in Mobile, Alabama, April 3-5, 1989 / - Hunter, William F.; Noor, Ahmed Khairy, (National Aeronautics and Space Administration, Langley Research Center ;, 1989)