Effect of layering angles on shape memory properties of graphene oxide/carbon fiber hybrid reinforced composites prepared by vacuum infiltration hot pressing system

摘要

Seven groups of different layering angles of Graphene oxide/Carbon fiber(GO-CF)hybrid reinforced shape memory composites are prepared by vacuum infiltration hot pressing system.The layering angles are respectively[0°]4,[±I5°]S,[±30°]s,[±45°]s,[±60°]s,[±75°]s,and[90°]4.The shape fixation ratio,shape recovery ratio,and shape recovery driving force of GO-CF hybrid reinforced shape memory composites are investigated.The composite with the layering angle of[0°]4 has the minimum shape fixation ratio of 90.9%,the maximum shape recovery ratio of 97.6%,and the maximum recovery force of 2.83 N.Compared to[0°]4,the composite with the layering angle of[90°]4 has the 9.13% higher shape fixation ratio,but it has 16.1% lower shape recovery ratio and 59.4% lower recovery force.The microstructure of the composites is characterized and the microstructure of seven groups of composites is satisfactory.Therefore,the matrix within each group of composites has a similar effect on the shape memory properties of the composites.With the layering angle increased,the fiber resilience in the axial direction(X-direction)and the accumulated internal stress gradually decrease.With the layering angle increased,the shape fixation ratio and recovery time of GO-CF hybrid reinforced shape memory composites increase,while the shape recovery ratio,recovery force,and recovery rate decrease.