Mechanical Properties Of Hybrid Composites Reinforced By Carbon And Basalt Fibers

Automobile lightweight is the development direction of automobile technology in low-carbon era.The application of lightweight materials and new structures is the main way to achieve lightweight vehicles.Carbon fiber reinforced plastic(CFRP)have been widely used in automotive industry due to their extraordinary specific strength/stiffness and low density.Nevertheless,its inherent brittleness and high cost somewhat obstruct the more extensive applications in industry.Basalt F iber has higher thermal resistance,superior ductility,and lower cost than carbon fiber.Hence the carbon/basalt fiber hybrid composite can not only combine the advantages of both fibers,but also can reduce the cost of the material,and has a wider appli cation prospect in the industry.Nevertheless,relatively fewer works have been reported on the mechanical properties of such hybrid composites reinforced by carbon and basalt fibers available on the market.In order to investigate and improve the performa nce of carbon/basalt fiber hybrid composite,which is adapt to practical applications.In this paper,the mechanical properties and failure mechanism of carbon/basalt fiber hybrid composites are systematically analyzed from the perspective of stacking sequ ences and hybrid ratio by combining experimental,theoretical and simulation methods.The specific contents can be summarized as follows:The influence of stacking sequences and hybrid ratio on the tensile properties of carbon /basalt fiber hybrid composites was studied by experimental method,the theoretical model was established.The stacking sequences had an evident influence on the tensile strength,while less on tensile modulus.The effects of stacking sequences and hybrid ratio on the flexural respons e of carbon /basalt fiber hybrid composites were studied by experimental methods.The progressive damage process and final failure mode of laminates were recorded and analyzed by digital photography and scanning electron microscopy,respectively.The results were verified by the finite element method and improved theoretical model.It is found a good agreement appears on the experimental,simulation and theoretical results.Basalt fibers can not only hinder the crack propagation in the thickness direction of the laminates,but also improve the brittle failure mode of carbon fiber laminates.The impact and residual bending properties of CFRP/BFRP hybrid composite laminates were studied by means of EPM(Energy Profiling Method)analysis and 3D scanning technology through low-speed impact and three-point bending tests.Results shown that BC3 S has the highest penetration threshold and the most excellent impact performance compared with C3B6C3 and B3C6B3.Placing the tough basalt fiber layer on the outer side of the laminate can effectively prevent the flexural properties of the composites degradation due to impact.