Abstract: A typical composite system used in naval ship was selected as the object of study, which include glass fiber (SW220(S2)) and carbon fiber (T700) as the reinforcing fiber, vinyl resin (430LV, 3201) and epoxy resin (350) as the matrix. Through the dynamic mechanical thermal analysis (DMA) test of Fiber Reinforced Polymer (FRP) with different fiber and matrix combination, the damping characteristics of the above materials system were obtained in different temperature and frequency, and the effect of fiber types, ply angle and resin matrix types were analyzed. The results show that the resin matrix is the main factor affecting the damping characteristics. In the three kinds of resin matrix, the tanδ_max(430LV)≈0.88, tanδ_max(3201)≈0.8, and tanδ_{max (350)}≈0.7. At 0 ℃~30 ℃, the loss factor of the resin matrix is about 0.05, and the loss factor of FRP is reduced to about 0.035 because of adding fiber, and the storage modulus is increased by 7 times~8 times. At 0 ℃~30℃, comparing with the composite whose fiber orientation is 0°/90°, the loss factor of composite with ±45° fiber orientation is increased by 0.02~0.03 and the storage modulus is decreased by 6 GPa~8 GPa. At 0 ℃~30 ℃, the loss factor of GFRP is 0.02 higher than that of the CFRP, but the storage modulus is 1/3. When the experimental frequency is increased from 1 Hz to 1000 Hz, the loss factor of FRP is decreased by 45%~70%, but the storage modulus is increased by less than 10%.

Key words: fiber reinforced polymer, damping, loss factor, time-temperature superposition, dynamic mechanical thermal analysis