This paper reports an innovative multiaxial 3D orthogonal-interlock woven architecture and weaving process, associated with the compressive properties of its composites. Three types of multiaxial 3D woven composite plates with different bias yarn contents (S1: 22.7%, S2: 27.1%, and S3: 33.2%) are prepared, compressive are loads applied in both the warp and weft directions, and the failure mechanism is evaluated using micro-computed tomography (micro-CT). The experimental results show that the compressive stress–strain curves of the specimens S1 and S2 under warp loading follow a linear increase prior to the peak stress, while that of the specimen S3 increases nonlinearly up to failure. Additionally, the stress–strain curves of all specimens loaded in the weft direction show a linear response within the full strain range. S1 and S3 withstand the maximum compressive strengths in the warp and weft directions accordingly. The compressive properties of multiaxial 3D woven composites mainly depend on the directional fiber content along the loading direction. CT image slices show that matrix cracks, fiber/matrix interface debonding and fiber breakage/splitting are the major failure patterns of multiaxial 3D woven composites subjected to compression loads.

本文报告了一种创新的多轴 3D 正交互锁编织结构和编织工艺，与其复合材料的压缩性能相关。制备了三种不同斜交纱含量（S1：22.7%，S2：27.1%，S3：33.2%）的多轴向3D编织复合板，压缩载荷为经纬向载荷，失效机理为使用显微计算机断层扫描评估（微CT）。实验结果表明，试样 S1 和 S2 在翘曲载荷下的压应力 - 应变曲线在峰值应力之前遵循线性增加，而试样 S3 的压缩应力 - 应变曲线非线性增加直至破坏。此外，在纬向加载的所有试样的应力-应变曲线在整个应变范围内显示出线性响应。S1和S3相应地承受经向和纬向的最大抗压强度。多轴 3D 编织复合材料的压缩性能主要取决于沿加载方向的定向纤维含量。CT 图像切片显示基体裂纹、纤维/基体界面脱粘和纤维断裂/分裂是多轴 3D 编织复合材料在压缩载荷下的主要失效模式。