Vibration damping of high Poisson's ratio fiber-reinforced polyurethane laminates.

摘要

Although lightweight structural composite materials damp vibrations better then metals, there is strong need for improvement. Recently, fiber reinforced polyurethane has received attention due to its high vibration damping capability. The current research evaluates the role of high Poisson's ratios in damping of mechanical vibrations in fiber reinforced solid (non-foam) polyurethane laminates in bending. Experimental data such as natural frequency, damping loss factors for bending and torsion modes were collected from aluminum baseline, soft and medium matrix laminated panels and compared to finite element analysis. Bending mode loss factors for the panels ranged from 2 to 8% and the laminates had skin loss factors up to 27%. For the panels, the soft laminate produced the highest damping with indications of some constrained layer damping between plies. When compared to experimental natural frequency results, the FEA results had variations at the higher modes. The average damping loss factor, as determined by FEA, was found to be 2.73% for the soft laminate and 1.63% for the medium laminate.