论文标题
与杂化Nacre样螺旋微结构的复合材料中的能量耗散
Energy dissipation in composites with hybrid nacre-like helicoidal microstructures
论文作者
论文摘要
天然陶瓷复合材料具有复杂的微观结构，可导致曲折的裂纹路径并赋予它们高韧性。当前的微有效复合材料尚未达到其微观结构中相同的复杂性水平，从而导致较差的性质。为了实现复杂的微观结构，使用具有4个自由度的设置进行了磁辅助滑移铸件（MASC）。在所有可能的微观结构中，由于其倾斜和扭曲裂纹路径的能力，选择了Nacre样和螺旋式排列之间的杂种设计。在压缩下测试了由硅酮基质中的氧化铝微血小板组成的杂化微观结构试样，并在压缩下进行了测试及其机械性能。尽管Nacre样复合材料表现出最高的强度和韧性，但螺旋杂种可以显示出一些延展性和更高的刚度。因此，这里提出的制造策略可能是研究更复杂的微观结构的简单途径，鉴于增加了微型骨骼增强复合材料的韧性。
Natural ceramic composites present complex microstructures that lead to tortuous crack paths and confer them high toughness. Current microreinforced composites do not yet reach the same level of complexity in their microstructures, resulting in poorer properties. To achieve complex microstructuration, magnetically-assisted slip casting (MASC) was conducted using a setup with 4 degrees of freedom. Among all possible microstructures, a hybrid design between nacre-like and helicoidal arrangements was selected due to its ability to tilt and twist the crack path. The hybrid microstructured specimen fabricated, consisting of aluminum oxide micro platelets in a silicone matrix, were tested under compression and their mechanical performance compared. Although nacre-like composites exhibited the highest strength and toughness, helicoidal hybrids could show some ductility and higher stiffness. The fabrication strategy proposed here could thus be a simple route to study more complex microstructures in view of increasing the toughness of microplatelet reinforced composites.
