Mechanical anisotropy of three dimensional woven composites

On-axis and off -axis tensile , compress , bend properties of four kinds of different st ructural carbon/epoxy 3D layer -to -layer orthogonal angle interlock woven composites along 0°, 30°, 45°, 60°, 90°directions areevaluated based on a series of experiment and analysis. The result s show that 3D angle interlock woven compositesbelong to the orthogonal anisot ropic material. The st rength-direction and modulus-direction curves of tensile ,compress and bend seem to be maple leaf s , and are characterized by double major axis. There are some differencesbetween these four kinds of different st ructures composites in mechanical anisot ropic properties , and better composites with larger st rength and modulus in the warp direction are the layer -to -layer angle interlock st ructures withstuffer warp , and , by cont rast , better composites with larger st rength and modulus in the weft direction are the layer-to-layer angle interlock st ructures with denser wef t density. It is emphasized that predicted mechanical propertiescan be achieved if fiber kind , fiber size , preform st ructure and yarn density are chosen reasonably.