考虑纬斜的三维机织圆筒预制体细观结构表征OA

Micro-computed tomography(Micro-CT)was employed to elucidate the actual meso-scale archi-tecture of 3D woven angle interlock cylinder preforms.A detailed analysis was conducted to ascertain the cross-sec-tional geometry and the spatial arrangement of yarns within each system.It was observed that the weft skew phenom-enon occurred during the fabrication process of the cylinder preform.Under the premise that the cross-sectional pro-files of warp and weft yarns are rectangular and lens-shaped,respectively,a geometric model for a 3D woven cylin-der fabric exhibiting weft skew has been formulated.This model delineates the interdependencies among yarn param-eters,fabric characteristics,and the structural dimensions of the cylinder preform.The model's accuracy has been quantified,with an error margin of-1.958％.The cylindrical specimen was meticulously prepared for subsequent a-nalysis.Analysis of the findings revealed that the weft yarn skew typically ranges from 30° to 50°,a variance that is significantly influenced by the weft density.Notably,the skew increases with a higher weft density.These insights provide crucial technical guidance for the process design of 3D woven cylinder prefabrication.