A DCAMM seminar will be presented by
Professor Dimitris A. Saravanos
Dept. of Mechanical Engineering & Aeronautics
University of Patras, Greece
Abstract:
Polymer-matrix composites exhibit significantly higher damping capacity than most common metals, as a result of the polymer matrix, interphases and heterogeneity. Therefore, composite laminates entail the potential to enhance structural damping through proper material selection, laminate configuration and structural design. They offer capabilities to further enhance damping through synergistic interactions with shear polymer damping layers and/or foam cores in sandwich laminates. The damping of composite structures is highly tailorable, yet antagonistic to stiffness and strength. Therefore, its exploitation requires robust multi-scale analytical capabilities ranging from the composite ply to the structural scale.
The presentation will review analytical and experimental work conducted on this subject. The theoretical background of composite damping will be reviewed. Mechanics for predicting the damping of angle-ply laminates, laminates with restrained viscoelastic layers and thick sandwich laminates with foam cores will be presented. The prediction of damping in composite structures using specialty finite elements will be outlined. Subsequently, the damping of composite beams, blade sections and large flexible blade structures will be analyzed. The structural mechanics and dynamics models will initially address the damping of composite beam sections behaving linearly, including sections with bending-torsion coupling. The effects of large rotations and geometric nonlinearity on the structural damping of strips, blade sections and flexible composite blades subject to either tensile loads or buckling loads will be finally presented. In all case, numerical results and correlations with measured data will be shown.
Danish pastry, coffee and tea will be served 15 minutes before the seminar starts.
All interested persons are invited