A hybrid fiber‐reinforced plastic (HFRP) composite is defined as a composite material that is reinforced by two or more continuous fiber materials in the same resin matrix. This article used the hand layup method to prepare epoxy‐based flax and glass HFRP composites. Under the same fiber hybrid ratio, the interlayer and sandwich hybrid lamination methods were used for mechanical properties testing of the composite. The tensile and bending properties of the HFRP composites were obtained by tensile and three‐point bending tests, and the cross‐sectional morphology of the material was observed by a scanning electron microscopy. The thermomechanical properties of the HFRP composite were analyzed by the dynamic mechanical thermomechanical analysis (DMTA). The results showed that the effect of the different layup methods on the tensile properties of the HFRP composite material was less than the effect of the bending properties, and the bending properties showed a significant positive effect for the hybrid composites. When the glass fiber sheet was used as the core layer and the flax fiber sheet was used as the surface layer, the hybrid composites had improved bending properties, and their bending strength and flexural modulus were approximately 3.22 times and 3.81 times that of flax FRP composites, respectively. The storage modulus and glass transition temperature of the HFRP composites were higher than those of flax FRP composites as they increased by 84.1% and 8.01°C, respectively.
In this study, we aimed to explore the effect of concrete short columns confined by flax/glass fiber hybrid-reinforced epoxy resin (FFRP/GFRP) composites. Taking the same fiber hybrid ratio and different paving orders as parameters, analysis of the axial compressive mechanical properties of eight groups of FFRP/GFRP composite-confined concrete short columns, including one group of flax fiber-reinforced epoxy resin (FFRP) composite-confined concrete short columns and one group of unconstrained concrete short column, was conducted. The effects of different layering sequences on failure modes, load–displacement curves, energy dissipation ductility and the stress–strain relationship of hybrid composite-confined concrete short columns were analyzed. The results show that the axial compression failure modes of FFRP/GFRP composite-confined concrete short columns with the same hybrid ratio and different paving sequences were basically the same, and the CC-H6 group was the most prominent. The ultimate bearing capacity and axial deflection were 91.05% and 11.49% higher than those of the control group (CC-FFRP), and the energy dissipation coefficient was also the largest, at 9.79. The failure trend of the stress–strain curve of the confined concrete short column specimens was basically the same, and the stress and axial strain of the members were increased by 247.9~292.5% and 486.7~701.0%, respectively.
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