知识与财富的链接
为研究变密度结构设计对三维机织角联锁复合材料面外力学性能的影响,设计制备了三维机织角联锁不变密度复合材料、三维机织角联锁经纱变密度复合材料和三维机织角联锁纬纱变密度复合材料。结合扫描电子显微镜、数字图像相关技术和X射线计算机断层扫描等检测技术,对角联锁变密度复合材料的面外压缩力学行为、内部损伤量化和渐进损伤等进行了测试与表征。研究结果表明：上疏下密角联锁纬纱变密度复合材料展现出优异的压缩性能,其压缩比强度比不变密度复合材料高3.40%;同时,上疏下密角联锁纬纱变密度复合材料损伤体积仅为11.64 mm3,远低于不变密度复合材料的26.90 mm3。进一步分析得到,不变密度复合材料压缩破坏以剪切失效为主,而上疏下密角联锁纬纱变密度复合材料则为基体开裂。
Objective Angle interlock composites have been widely used in defense engineering fields because of their excellent interlayer delamination performance, strong designability, near-clean forming and other characteristics, and can still maintain good structural integrity after post-processing. In recent years, major equipment components in the air, sky and sea have increasingly high requirements for lightweight, and, therefore, it is urgent to carry out innovative structural design and application of angle interlock composites to effectively reduce structural parameters and improve load-bearing efficiency. Among them, angle interlock composite with variable densities provides an effective means to realize the "light-strength coordination" of components.
