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GOALI: Deformation and Cracking Behavior of Oxide Glass under Indentation

目标：压痕下氧化物玻璃的变形和开裂行为

基本信息

批准号：
1936368
负责人：
Liping Huang
金额：
$ 63.79万
依托单位：
Rensselaer Polytechnic Institute
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-03-15 至 2025-02-28
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1936368&HistoricalAwards=false
关键词：
GOALI Deformation Cracking Behavior Oxide

项目摘要

NON-TECHNICAL DESCRIPTION: Crack-resistant glass is of paramount importance for a wide range of applications such as personal electronics, automobiles, solar panels, buildings, and submarine communications cables. This project aims to advance fundamental knowledge on crack initiation in glass under impact (e.g., dropping a smart phone with cover glass onto a solid floor). This project gains this knowledge by integrating in-situ experiments with virtual mechanical tests in large-scale computer simulations. An integrated education component is to develop computational modules for a required undergraduate course “Computational Materials Design”. Students involved in the project have opportunities to interact with researchers at Corning Incorporated in characterizing the structure of glasses and solving practical problems in the industrial setting. In carrying out this project, graduate and undergraduate students are trained in frontier areas of glass science and technology. On-going efforts are being made to inspire and encourage K-12 students to pursue science and engineering as a career path, by igniting curiosity in young minds and instilling confidence in women and underrepresented minorities.TECHNICAL DETAILS: Despite extensive studies, what controls crack initiation in glass under sharp contact loading remains elusive. The difficulty arises mainly due to the experimental complexity associated with in-situ investigations at a local scale (tens of microns) under complex and non-uniform stresses. In this project multiple in-situ optical diagnosis techniques such as Raman, optical microscopy and Brillouin light scattering are used simultaneously to characterize the evolution of structure and properties of glass under uniform stress states (e.g., hydrostatic, uniaxial compression or a mixed state) in a diamond anvil cell to provide the reference data necessary for understanding the glass response to sharp contact loading. Micro-Brillouin spectroscopy is used to map the residual densification underneath an indent and the residual stress field around an indentation with a spatial resolution of ~1 um. These results provide key insights in understanding the deformation and cracking behaviors of glass under indentation, and critical data for fitting potential parameters for molecular dynamics simulations of multi-component glasses and for validating computer models. Based on these reliable potentials, virtual mechanical tests such as 3D nanoindentation in molecular dynamics simulations with well-controlled parameters are carried out to provide a detailed understanding of the dynamic structural changes, the deformation modes, and the critical stress states that lead to the initiation of different types of cracks under indentation. Simulated 3D nanoindentation tests are providing the key missing information in experiments that has limited one’s understanding of how glass cracks.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.

非技术描述：抗裂玻璃对于个人电子产品、汽车、太阳能电池板、建筑物和海底通信电缆等广泛应用至关重要。该项目旨在提高玻璃在冲击下裂纹萌生的基础知识（例如，将带有盖玻璃的智能电话掉落到固体地板上）。该项目通过将现场实验与大规模计算机模拟中的虚拟机械测试相结合来获得这些知识。一个综合教育组成部分是为本科生必修课程“计算材料设计”开发计算模块。参与该项目的学生有机会与康宁公司的研究人员进行互动，以描述玻璃的结构并解决工业环境中的实际问题。在执行这一项目时，研究生和本科生在玻璃科学和技术的前沿领域接受培训。通过激发年轻人的好奇心，培养女性和少数族裔的自信心，不断努力激励和鼓励K-12学生将科学和工程作为职业道路。技术难题：尽管进行了广泛的研究，但在急剧接触载荷下，控制玻璃裂纹萌生的因素仍然难以捉摸。出现的困难主要是由于在复杂和不均匀的应力下，在局部尺度（几十微米）的现场调查相关的实验复杂性。在本项目中，同时使用拉曼、光学显微镜和布里渊光散射等多种原位光学诊断技术来表征玻璃在均匀应力状态（例如，流体静力学、单轴压缩或混合状态），以提供理解玻璃对尖锐接触载荷的响应所需的参考数据。微布里渊光谱是用来映射的残余致密化下的一个压痕和周围的残余应力场的空间分辨率为1微米。这些结果提供了关键的见解，在理解下压痕玻璃的变形和开裂行为，和关键数据拟合潜在的多组分玻璃的分子动力学模拟参数和验证计算机模型。基于这些可靠的潜力，虚拟力学测试，如三维纳米压痕在分子动力学模拟与良好控制的参数进行详细了解的动态结构变化，变形模式，和临界应力状态，导致不同类型的裂纹压痕下的启动。模拟三维纳米压痕测试提供了实验中缺失的关键信息，这些信息限制了人们对玻璃如何破裂的理解。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。