混杂类珍珠层螺旋微结构复合材料的能量耗散
Energy dissipation in composites with hybrid nacre-like helicoidal microstructures
摘要：
天然陶瓷复合材料具有复杂的微观结构，导致曲折的裂纹路径并赋予其高韧性。目前的微增强复合材料在其微观结构中尚未达到相同的复杂程度，导致性能较差。为了实现复杂的微结构化，磁辅助注浆成型（MASC）进行了使用设置与4个自由度。在所有可能的微结构中，选择了珍珠状和螺旋状排列之间的混合设计，由于其能够倾斜和扭曲裂纹pathway.Hybrid微结构试样制造，由氧化铝微晶片在有机硅基体中组成，在压缩下进行测试，并比较它们的力学性能。虽然珍珠质类复合材料表现出最高的强度和韧性，螺旋杂交体可以表现出一定的延展性和更高的刚度。因此，这里提出的制造策略可以是一个简单的路线，研究更复杂的微观结构，在增加微片增强复合材料的韧性。
英文摘要：
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.
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