Abstract In this study, for the first time, we produced synthetic spicule-inspired structures (SISs) by 3D printing technology to improve both strength and toughness of brittle rigid resin. The SISs with 0.375 mm cylinder wall thickness without cores showed an improvement of 21%, 1450%, 6000% and 68% in flexural strength, strain, specific toughness and buckling stress (compared to the control samples), respectively. The Shear test results showed that SISs, provide a structure with better dispersing stress. Changing the architecture of solid rods to spiculic structures led to stopping and deflecting the crack path, and subsequently prevented catastrophic failure in these structures. Therefore, SISs can offer a novel and promising approach to increase the strength and flexibility of these brittle materials.

中文翻译：

---

增材制造仿生人工骨针的裂纹扩展和增韧机制

摘要 在这项研究中，我们首次通过 3D 打印技术制备了合成针状结构（SISs），以提高脆性刚性树脂的强度和韧性。0.375 mm 圆柱壁厚且无芯的 SIS 的弯曲强度、应变、比韧性和屈曲应力（与对照样品相比）分别提高了 21%、1450%、6000% 和 68%。剪切试验结果表明，SIS 提供了具有更好分散应力的结构。将实心杆的结构更改为针状结构可以阻止和偏转裂纹路径，从而防止这些结构发生灾难性故障。因此，SIS 可以提供一种新颖且有前景的方法来增加这些脆性材料的强度和柔韧性。