Research in Structures, Structural Dynamics and Materials, 1990 : work-in-progress papers presented at the AIAA/ASME/ASCE/AHS/ASC 31st Structures, Structural Dynamics and Materials Conference held in Long Beach , California, April 2-4, 1990 / - Barthelemy, Jean-Francois M.; Noor, Ahmed Khairy, (National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division ;, 1990)