Collaborative Research: Fracture Mechanics of Glasses with Nanoscale Phase Separation - A Multiscale Experimental and Computational Study

合作研究：纳米级相分离玻璃的断裂力学——多尺度实验和计算研究

基本信息

批准号：
1762275
负责人：
John Mauro
金额：
$ 25万
依托单位：
Pennsylvania State Univ University Park
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-07-01 至 2023-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1762275&HistoricalAwards=false
关键词：
Collaborative Research Fracture Mechanics Glasses

项目摘要

Although glasses exhibit unique properties, such as high strength and transparency, their inherent brittleness seriously limits their use in many practical applications. Extrinsic treatments can increase the toughness of glass but typically compromise its optical transparency. As an alternative route, this award supports fundamental research to elucidate how controlled nanoscale composition may be used to enhance the resistance to fracture of glass. This knowledge will accelerate the design of tough, yet transparent glasses. Insights from this study will promote glass as a competitive material for a broader range of applications, for which glasses have not been considered until now due to concerns related to safety and reliability resulting from their risk of fracture. Insights from this project will also lead to improved glass performance in many existing applications,for instance, lighter automotive windshields would result in significant energy savings. Thus, the research will not only promote the progress of science but due to the prevalence of glass will also advance the national health, prosperity, and welfare. By integrating multiple disciplines, including physics, material science, and mechanical engineering, this research will train a diverse group of students in various aspects of engineering and contribute to forming the next generation of scientists that the U.S. glass industry critically needs to compete globally. In addition, this award will support: inclusion of undergraduate students in research, integration of research and education through extensive collaboration with glass manufacturer Corning Inc., and recruitment of minority students and outreach to K-12 students through university programs Brittleness remains the main drawback of glasses. To overcome this age-old limitation, this research aims to elucidate the effects of nanoscale heterogeneities and controlled phase separation on the fracture toughness of calcium aluminosilicate glasses,an archetypical model for alkali-free display glasses. The bottom-up strategy relies on high-throughput molecular dynamics simulations, benefits from topological constraint theory, and culminates in peridynamic simulations to ensure the hand-shake of all the considered spatial scales: atoms, microstructure, and continuum. These predictions are systemically validated by experiments, which comprise structural analysis and mechanical tests. This interdisciplinary effort will offer some new insights in the thermodynamics and kinetics of phase separation in glasses. This new fundamental knowledge will serve as a guide to elucidate the distinct roles of the atomic topology, heterogeneity thereof, and nanoscale phase separation in controlling the nanoductility and macroscopic toughness of silicate glasses.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

尽管眼镜表现出独特的特性，例如高强度和透明度，但它们的固有脆性严重限制了它们在许多实际应用中的使用。外在处理可以增加玻璃的韧性，但通常会损害其光学透明度。作为替代途径，该奖项支持基础研究，以阐明如何使用受控的纳米级成分来增强对玻璃断裂的抗性。这些知识将加速强硬但透明的眼镜的设计。这项研究的见解将促进玻璃作为更广泛的应用范围的竞争材料，直到现在，由于与骨折风险相关的安全性和可靠性，直到现在才考虑眼镜。该项目的见解还将导致许多现有应用中的玻璃性能提高，例如，更轻的汽车挡风玻璃将导致大量节能。因此，这项研究不仅将促进科学的进步，而且由于玻璃的盛行，还将促进国家健康，繁荣和福利。通过整合包括物理学，材料科学和机械工程在内的多个学科，这项研究将培训各个工程各个方面的多元化学生，并为组成下一代科学家而做出贡献，美国玻璃行业在全球范围内需要竞争。此外，该奖项将支持：通过与玻璃制造商Corning Inc.的广泛合作以及招募少数族裔学生的招聘以及通过大学课程通过大学课程招募K-12学生的研究，包括研究和教育的本科生在研究和教育中融合，这仍然是眼镜的主要缺点。为了克服这一古老的局限性，该研究旨在阐明纳米级异质性和控制相分离对钙铝硅酸盐玻璃的断裂韧性的影响，铝硅酸盐玻璃是一种无碱性显示玻璃的原型模型。自下而上的策略依赖于高通量分子动力学模拟，受拓扑约束理论受益，并在植物动力学模拟中达到顶点，以确保所有所考虑的空间尺度的手持：原子，微结构和连续性。这些预测是通过实验系统验证的，该实验包括结构分析和机械测试。这项跨学科的工作将提供一些在玻璃相位分离的热力学和动力学方面的新见解。这种新的基本知识将作为阐明原子拓扑，异质性和纳米级阶段分离在控制硅酸盐眼镜的纳米可靠性和宏观韧性方面的独特作用的指南。这项奖项反映了NSF的法定任务，并通过评估该基金会的智力效果，并通过评估了基金会的范围。