The Torsional Damping Properties of FRP Laminated Cylinder.

The dynamic characteristic of the FRP is important for the application of robot arm etc. In this work, we applied damping capacity conception to torsional damped oscillation of laminated composite cylinder and suggested a method to estimate the torsional damping characteristic. An experiment was conducted to verify the theory and this calculation method. The good agreement obtained between the theoretical and the experimental values for seven types of laminated composite cylinders, these being unidirectional (0°, 90°) plies, cross-plies (±15°, ±30°, ±45°, ±60°, +75°) plies. It shows that the mathematical technique developed here is satisfactory for predicting the damping behaviors of laminated composite cylinders. Torsional damping characteristic of laminated composite cylinder varies with fiber orientation angle.