Hybrid effect and pseudo-ductile behaviour of unidirectional interlayer hybrid FRP composites for civil engineering applications. (20th May 2018)

• Record Type: Journal Article
• Authors: Ribeiro, Filipe; Sena-Cruz, José; Branco, Fernando G.; Júlio, Eduardo
• Is Part Of: Construction & building materials. Volume 171(2018)
• Page Start: 871
• Page End: 890
• Publication Date: 2018-05-20
• Subjects: Hybrid composite -- Fragmentation -- Mechanical properties -- Analytical modelling; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.03.144
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Influence of several factors on hybrid effect was investigated. Significant hybrid effects on both ST carbon and HM carbon materials were registered. Combining HM carbon with E-glass or basalt or ST carbon lead to pseudo-ductile tensile behaviour. Existing analytical model satisfactorily predicted the response of these hybrid composites. Abstract: An experimental study on the tensile stress-strain curves of interlayer (layer-by-layer) unidirectional hybrid FRP composites was conducted aiming at evaluating the corresponding hybrid effect and pseudo-ductility of this innovative solution. Different combinations of the following dry unidirectional fabric materials, also varying the number of layers, were adopted in tests: high-modulus carbon, standard carbon, E-glass, and basalt. The composites were produced layer-by-layer by hand lay-up method, using an epoxy-based resin as matrix. The results have shown a strain increase at failure of both standard carbon and high-modulus carbon fibres with the volume decrease of these materials in hybrid combinations. It was also concluded that combining high-modulus carbon with E-glass, high-modulus carbon with basalt, or high-modulus carbon with standard carbon can lead to very good pseudo-ductile tensile behaviour. Finally, it should be highlighted that an existing analytical model in the literature was satisfactorily adopted to predict the tensile response of these hybrid composites.