Interface Engineering of Fiber Reinforced Calcium-based Composites

纤维增强钙基复合材料界面工程

• 批准号: 1462575
• 负责人: Florence Sanchez
• 金额: $ 29.99万
• 依托单位: Vanderbilt University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1462575&HistoricalAwards=false
• 关键词: Interface; Engineering; Fiber; Reinforced; Calcium

The use of discontinuous and randomly oriented nano/microfibers (steel, carbon, polymer) as reinforcements in calcium-based materials for civil and biomedical applications has received increasing attention due to their promising potential for superior structural and multifunctional composites. The interface between the fibers and the matrix plays a vital role in material performance and must be accurately characterized to effectively design materials. The goal of this research project is to understand reinforcement mechanisms in fiber reinforced calcium-based composites. Fundamental understanding of key features of fiber reinforcements will enable better material design and fabrication strategies. The broader impacts are twofold. Civil engineering applications: Advanced materials that extend the life of civil infrastructure, reduce maintenance costs, and enhance safety and sustainability will save billions of tax dollars a year and have many magnified indirect effects on society. Biomedical applications: Advanced biomimetic materials will provide more effective medical treatments. The educational component will introduce high school students to the intriguing science of the very small and will develop a graduate level course module on material durability.The goal is to fundamentally understand the molecular structure and dynamics at the fiber-solid-liquid interfaces that control reinforcement mechanisms in fiber reinforced calcium-based materials with an emphasis on determining the nature of the interface and how it relates to interfacial mechanical behavior. The focus is on the molecular to nanoscale and the chemo-mechanical interactions at reinforcement matrix interfaces. Molecular dynamics modeling and experimental characterizations of the structure and dynamics of the interfaces will be integrated to (i) elucidate the interfacial interactions between fiber surfaces, calcium-bearing solid phases, and surrounding liquid phases, (ii) quantify and relate the effect of the chemical structure to the mechanical properties of reinforcement matrix interfaces, and (iii) formulate molecular dynamics-informed interface cohesive traction-separation relationships that connect the molecular scale to the micro-continuum scale at interfaces. The research will (i) provide a molecular to nanoscale picture necessary to achieve improved engineering properties, (ii) make advances in relating chemistry and mechanical properties at interfaces, and (iii) bridge the gap between nano-mechanics and micro-mechanics at interfaces.

不连续和随机取向的纳米/微米纤维（钢、碳、聚合物）作为用于民用和生物医学应用的钙基材料中的增强体的使用由于其作为上级结构和多功能复合材料的有前途的潜力而受到越来越多的关注。纤维和基体之间的界面在材料性能中起着至关重要的作用，必须准确表征以有效设计材料。本研究的目的是了解纤维增强钙基复合材料的增强机理。对纤维增强材料关键特性的基本了解将有助于更好地设计材料和制定制造策略。更广泛的影响是双重的。土木工程应用：先进的材料可以延长民用基础设施的寿命，降低维护成本，提高安全性和可持续性，每年将节省数十亿美元的税收，并对社会产生许多放大的间接影响。生物医学应用：先进的仿生材料将提供更有效的医学治疗。教育部分将向高中生介绍有趣的微小科学，并将开发有关材料耐久性的研究生水平课程模块。目标是从根本上了解控制纤维增强机制的纤维-固-液界面的分子结构和动力学纤维增强钙-基于材料，重点是确定界面的性质以及它与界面机械行为的关系。重点是分子到纳米级和增强基体界面的化学机械相互作用。分子动力学建模和实验表征的结构和动力学的接口将被整合到（i）阐明纤维表面，含钙固相，和周围的液相之间的界面相互作用，（ii）量化和相关的化学结构的影响，增强基体界面的机械性能，以及（iii）制定分子动力学通知的界面内聚牵引-分离关系，其在界面处将分子尺度连接到微连续尺度。这项研究将（i）提供一个必要的分子到纳米级的图片，以实现改进的工程性能，（ii）在相关的化学和机械性能的接口，和（iii）桥梁之间的差距差距纳米力学和微观力学接口的进展。