MATERIAL DAMPING IN COMPOSITE ROTORS

The paper is concerned with material damping in composite rotors. The material damping for a high-modulus carbon fiber in epoxy resin has be en investigated for different angles of filament winding. When the sep arate contributions on the damping from the stresses in the directions of the fibers, transverse to the fibers and in shear are taken into a ccount, the damping coefficient has a minimum when the filament windin g angle is between 10 degrees and 45 degrees, which fortunately for mo st applications is also the optimal interval for the filament winding angle to get minimum weight. To get the lowest possible dissipation en ergy for three different constraints, lateral eigenfrequency, maximum torque due to static stress and maximum torque due buckling, there exi sts an optimal filament winding angle interval. This interval is in th e same region as the optimal filament winding for minimum weight.