Towards Multiscale Mechanical Design of Hierarchical Cellular Materials

面向分层多孔材料的多尺度机械设计

• 批准号: 0824688
• 负责人: Youping Chen
• 金额: $ 25万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0824688&HistoricalAwards=false
• 关键词: Towards; Multiscale; Mechanical; Design; Hierarchical

Wood is an example of an extraordinary cellular material that is highly porous yet lightweight, strong, stiff, hard and tough, a combination of mechanical properties that have not been achieved in synthetic porous materials. The objective of this proposal is to use computational and experimental analyses to create a fundamental understanding of how the multiscale structural organization of wood, from the molecular to the macroscopic, determines its mechanical properties and to discover design principles that may generally apply to multiscale hierarchical design of synthetic cellular materials. The outcomes of this research will include: (1) a simulation tool for multiscale modeling of polymeric materials from the atomic to the macroscopic, (2) a quantitative structural model of wood from molecules to wood tissue, (3) the multiscale structure-property relationship of wood, and (4) guidelines for hierarchical design of synthetic cellular materials.If successful, this research will not only enhance our understanding of the unique mechanical properties of wood, but will also provide a theoretical tool for analysis and design of hierarchically-structured polymeric materials. It will contribute to the development of next generation multiscale, multifunctional composite materials. In addition, a fundamental understanding of the importance of the hierarchical structure of wood is also crucial for plant biologists who are interested in the genetic mechanisms that govern secondary cell wall formation. Simulation tools that give insight into how wood composition and structure determine its mechanical properties will also inform biologists about how wood composition can be modified to enhance specific end uses. This research necessarily merges materials science and mechanical engineering with biology, and, therefore, provides a unique opportunity to establish a multidisciplinary learning and training program that transcends the traditional boundaries between academic disciplines and offer students an integrated approach of team research and career development.

木材是一种特殊的多孔材料，这种材料具有高度渗透性，但重量轻、强度大、坚硬、坚硬，具有合成多孔材料所不具备的机械性能。这项建议的目的是利用计算和实验分析，从根本上理解木材的多尺度结构组织，从分子到宏观，如何决定其机械性能，并发现通常适用于合成蜂窝材料的多尺度分层设计的设计原则。本研究的成果包括：(1)聚合物材料从原子到宏观的多尺度模拟工具；(2)木材从分子到木材组织的定量结构模型；(3)木材的多尺度结构-性能关系；(4)合成多孔材料的分级设计准则。如果研究成功，这项研究不仅将加深我们对木材独特力学性质的理解，还将为分层结构聚合物材料的分析和设计提供理论工具。它将为下一代多尺度、多功能复合材料的发展做出贡献。此外，对于对次生细胞壁形成的遗传机制感兴趣的植物生物学家来说，对木材等级结构的重要性有一个基本的了解也是至关重要的。模拟工具可以深入了解木材成分和结构如何决定其机械性能，还将向生物学家提供有关如何修改木材成分以增强特定最终用途的信息。这项研究必然将材料科学和机械工程与生物学相结合，因此，它提供了一个独特的机会，以建立一个超越传统学科之间界限的多学科学习和培训计划，并为学生提供团队研究和职业发展的综合方法。