模拟微结构对片状增强复合材料和陶瓷中弹性波传播的影响
Modeling the effect of microstructure on elastic wave propagation in platelet-reinforced composites and ceramics
摘要：
致密陶瓷在要求高机械刚度、耐化学性和耐温性以及低重量的应用中是不可替代的。为了提高其韧性，陶瓷可以用细长的夹杂物来增强。最近的制造策略已被开发来控制聚合物和陶瓷基体中的盘状微粒的取向，并建立周期性的微结构。鉴于可用的可能的微观结构的无限数量，需要建模工具来选择潜在的最佳设计。周期性微结构可参与弹性波散射以耗散来自振动的机械能。在本文中，提出了一个模型来确定的频率带隙的周期性结构的复合材料和陶瓷和微结构参数的影响进行了研究。结果被用来定义未来制造的硬块体陶瓷材料，结合传统的陶瓷性能与高抗振性的指导方针。
英文摘要：
Dense ceramics are irreplaceable in applications requiring high mechanical stiffness, chemical and temperature resistance and low weight. To improve their toughness, ceramics can be reinforced with elongated inclusions. Recent manufacturing strategies have been developed to control the orientations of disc-like micro-particles in polymeric and ceramic matrices and to build periodic microstructures. Given the infinite number of possible microstructures available, modeling tools are required to select the potentially best design. Periodic microstructures can be involved in elastic wave scattering to dissipate mechanical energy from vibrations. In this paper, a model is proposed to determine the frequency bandgaps associated to periodic architectures in composites and ceramics and the influence of microstructural parameters are investigated. The results are used to define guidelines for the future fabrication of hard bulk ceramic materials that combine traditional ceramic properties with high vibration resistance.
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