Elastic properties of needled and braiding C/C composites
Based on the microstructure,volume parameters and braiding angle of needled and braiding C/C composites,a unit cell model with needled areas and braiding structures is proposed,in order to study the effect of braiding structure and needled density on the overall mechanical properties of the composites.A microstructure model of needled and braiding C/C composites was established to study the effects of braiding angle and needled density on the overall elastic properties of the composites.The results indicate that there is stress concentration in the contact area between the acupuncture area and the fibers,as well as in the matrix around the fibers area.The braiding angle had a significant impact on the elastic properties of the needled and braiding C/C composites.The axial tensile test of composites was conducted according to the standard of GB/T 33501-2017,and the predicted elastic modulus of the model was in good agreement with the experimental data,with an error of 2.27％in the predicted results.The study of the microstructure of needled and braiding C/C composites can provide some basis for the design of the microstructure and exploration of mechanical properties of subsequent composites.
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