Research On The Properties Of Carbon Fiber Triaxial Woven Fabric Composite

The basic structure of Triaxial Woven Fabric(TWF)has regular hexagonal holes evenly distributed in the plane.The performance of triaxial woven composite material has the advantages of in-plane quasi-isotropy,and it can effectively reduce the surface density of the material.Sports equipment and other fields have great application potential.Carbon fiber triaxial woven composite materials can be used for satellite mesh reflector antennas,but the current material performance research is insufficient.In this paper,research work is carried out on the preparation of carbon fiber triaxial woven fabric composites,mechanical performance testing,and failure mechanism analysis.First,using T300 carbon fiber as the reinforcing fiber material and epoxy resin as the matrix,the porous carbon/epoxy triaxial woven composite material was prepared by the resin film infusion(Resin Film Infusion,RFI)process.A total of 2kinds of fine fiber were designed.The four specifications of samples with a combination of 3 degrees and 3 center distances correspond to the realization of 3specifications of porosity,which are 34%,37%,and 41% respectively.Secondly,an in-plane tensile test,a three-point bending test,and a bending test were carried out.The non-contact full-field strain(Digital image correlation,DIC)measurement system was used to record the strain distribution of the sample,and the3 D profiler was used to observe the sample tension.The morphology of the extended fracture surface is analyzed,and the influence of fabric structure parameters on the in-plane quasi-isotropic mechanical properties of the specimen and the tensile damage mechanism are analyzed.The results show that for materials of different specifications,the maximum decrease in tensile strength at 7 angles in the plane is 55%,which is a decrease of 76.45 MPa,and the maximum decrease in tensile modulus is 30%,which is a decrease of 4.16GPa;when the porosity is 34%,When the fiber bundle is T300-3K,the tensile performance is the best,the average in-plane tensile strength is 94.52 MPa,and the average tensile modulus is 11.23 GPa.The porosity and fiber bundle specifications are negatively correlated with the tensile modulus;the main failure modes of tensile failure include fiber bundle fracture,fiber bundle pull-out and staggered failure,and the main tensile failure mechanisms are pure shear failure and torsional shear failure,Tension-shear coupling failure.The main influencing factors of the bending elastic modulus are the material thickness and the specification of carbon fiber bundle;the in-plane quasi-isotropy coefficient is between 0.76 and 0.96,the difference is small,and the quasi-isotropic characteristics are obvious.The minimum foldable radius of the bending performance is quasi-isotropic,and the change trend is the same as the bending elastic modulus,and the average minimum foldable radius is 5.77 mm.In addition,the in-plane compression performance test method of thin-plate composite materials was explored.The sandwich column sandwich method was used to test the in-plane compression performance of the triaxial woven composite material.The isotropy coefficient is between 0.77 and 0.91,and the compressive strength has a significant positive correlation with the porosity and thickness of the composite material.