Abstract Interpenetrating phase composite (IPC), also known as co-continuous composite, is one type of material that may exhibit an unusual combination of high stiffness, strength, energy absorption, and damage tolerance. Here we experimentally demonstrate that IPCs fabricated by 3D printing technique with rationally designed architectures can exhibit a fracture toughness 16 times higher than that of conventionally structured composites. The toughening mechanisms arise from the crack-bridging, process zone formation and crack-deflection, which are intrinsically controlled by the rationally designed interpenetrating architectures. We further show that the prominently enhanced fracture toughness in the architected IPCs can be tuned by tailoring the stiffness contrasts between the two compositions. The findings presented here not only quantify the fracture behavior of complex architected IPCs but also demonstrate the potential to achieve tailorable mechanical properties through the integrative rational design and the state-of-the-art advanced manufacturing technique.

中文翻译：

---

通过 3D 打印增强结构互穿相复合材料的断裂韧性

摘要 互穿相复合材料 (IPC)，也称为共连续复合材料，是一种具有高刚度、强度、能量吸收和损伤容限的不寻常组合的材料。在这里，我们通过实验证明，通过 3D 打印技术制造的具有合理设计架构的 IPC 的断裂韧性是传统结构复合材料的 16 倍。增韧机制源于裂纹桥接、工艺区形成和裂纹偏转，这些都由合理设计的互穿结构本质上控制。我们进一步表明，可以通过调整两种组合物之间的刚度对比来调整结构化 IPC 中显着增强的断裂韧性。