Understanding What Makes Nacre Strong and Tough --Development of New Bioinspired Nanocomposites

了解是什么使珍珠层强大和坚韧-设计规则制造合成纳米复合材料模仿贝壳摘要珍珠层从贝壳是一种天然的复合材料，具有精心设计的微观结构，其强度和韧性是其组成部分的20至30倍。控制其显着的机械行为是知之甚少，也没有设计指导方针，以开发新的合成复合材料模仿珍珠层。在这个方向上的第一个努力将是一个多尺度的微结构如何控制珍珠层的变形和破坏机制的整个调查。在这个阶段采用最先进的实验技术和密集的建模。在第二项努力中，将开发新型纳米复合材料模仿珍珠层。他们的设计将基于形态和机械特征，这些特征被认为是珍珠层强度和韧性的关键。陶瓷薄片与较软金属相结合的组合将提供一种坚硬且耐损伤的材料，适用于航空航天和MEMS/NEMS应用。

UNDERSTANDING WHAT MAKES NACRE STRONG AND TOUGH -- Design Rules for Manufacturing Synthetic Nanocomposites Mimicking SeashellsAbstractNacre from seashells is a natural composite with such a well-designed microstructure that its strength and toughness are 20 to 30 times those of its constituents. What controls its remarkable mechanical behavior is poorly understood and there is no design guideline to develop new synthetic composites mimicking nacre. A first effort in this direction will be a throughout investigation of how the microstructure controls the deformation and failure mechanisms of nacre at multiple scales. State of the art experimental techniques and intense modeling are employed at this stage. In a second effort, novel nanocomposites mimicking nacre will be developed. Their design will be based on the morphological and mechanical features that where identified to be key to the strength and toughness of nacre. A combination of ceramic platelets bonded with a softer metallic phase would provide a hard and damage tolerant material ideal for aerospace and MEMS/NEMS applications.