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针对植入Z-pin后的碳纤维增强平纹机织复合材料的微观结构,建立了含Z-pin的机织复合材料单层板和层合板的单胞模型。预报了Z-pin直径、面内分布密对单层板的面内纵向拉伸力学性能的影响,得出了含有Z-pin的机织复合材料单胞在受面内拉伸时,会在Z-pin附近出现应力集中,单胞首先会在应力集中区域发生失效而导致强度降低。通过三维单胞模型模拟了Z-pin在层合板中拉出脱离过程,得出了不同Z-pin直径、不同分离层厚度下的拉拔力—位移曲线。建立了用非线性弹簧模拟Z-pin的双悬臂梁模型,结合VCCT裂纹扩展技术,模拟了含有Z-pin复合材料层合板的Ⅰ型裂纹扩展,得出了Z-pin直径越大,分布越密,层合板的等效Ⅰ型应变能量释放率GIC越大,且直径越大使GIC随裂纹扩展的波动幅度越大,分布越密使GIC波动的波长越小。
Aiming at the microstructure of carbon fiber reinforced plain weaved composites with Z-pin implanted, a single cell model of Z-pin woven composite monolayer and laminate was established. The effect of Z-pin diameter and in-plane distribution density on the longitudinal tensile mechanical properties of single-layer sheet is predicted. It is concluded that when the Z-pin-containing woven composite unit cells are stretched in the in-plane, In the vicinity of the Z-pin, stress concentration occurs, and the unit cell first fails in the stress-concentrated region and causes a decrease in strength. The pull-out process of Z-pin in laminate was simulated by 3D cell model, and the pullout-displacement curves of Z-pin with different thickness of separation layer were obtained. A double-cantilever beam model with Z-pin nonlinear spring was established. Combined with the VCCT crack propagation technique, the crack propagation of type Ⅰ with Z-pin composite laminates was simulated. The larger the Z-pin diameter, the larger the distribution The greater the GIC, the larger the GIC, and the larger the GIC amplitude with crack propagation, the closer the distribution is, the smaller the GIC wave length is.