Study On The Preparation And Mechanical Properties Of Three-dimensional Woven Tubular Carbon Fiber Composites

3D woven fabric composite material is prepared by composite process by using threedimensional woven fabric as preform.Compared with traditional 2D fabric laminate composite,3D woven fabric composite has better interlaminar shear resistance.In addition,for the prefabricated fabric with complex shape,it can be woven in one time to improve the integrity of the composite material.At present,3d woven fabrics and their composites have attracted more and more attention in domestic high-tech industries,and many achievements have been made in design and application.This topic design weaving the three different woven structure,the prefabricated body 3D carbon fiber cylinder fabric composite was prepared by using VARTM molding process the carbon fiber cylinder,the carbon fiber cylinder of different woven structure of composite material mechanics test,at the same time on the cylinder of 3D woven composites mesoscopic modeling and simulation analysis.Firstly,the weaving process and common structure of 3D woven cylindrical fabric were studied.Three kinds of fabric structures,namely shallow curve-link,shallow straight-link and through-thickness orthogonal,were selected.The machine drawing was designed according to the fabric structure,and four layers of carbon fiber cylindrical fabric were woven on 3D cylinder loom.Then,epoxy resin was used as the matrix material and VARTM process was used to compound the 3D woven cylinder composites.Compared with stainless tube core mold and paraffin rod core mold,3D woven carbon fiber cylinder composites with better quality and appearance were prepared.Furthermore,axial compression and three-point bending tests were carried out on the three-dimensional woven carbon fiber cylinder composites to obtain the compression and bending strength of the specimens.The failure process of the composites during deformation was recorded,and the mechanical behaviors of the specimens with different microstructure under compression and bending state were analyzed.Finally,the geometric relationship of the meso-structure of 3D woven carbon fiber cylinder composites is analyzed.A typical single cell model of 3D woven carbon fiber cylinder composites is established by Solidworks 3D modeling software.The single cell compression performance is simulated by using the progressive damage analysis method.The effect of fabric structure on progressive damage behavior of composites was analyzed and compared.