Debonding in Bi-layer Material Systems under Moisture Effects : A Multi-scale Fracture Approach

水分影响下双层材料系统的脱粘：多尺度断裂方法

• 批准号: 0856325
• 负责人: Oral Buyukozturk
• 金额: $ 35.39万
• 依托单位: Massachusetts Institute of Technology
• 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: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0856325&HistoricalAwards=false
• 关键词: Debonding; Bi; layer; Material; Systems

Bi-layer material systems are present in various applications ranging from nanometer thick thin films in circuit boards to large structural elements in a building. Fracture behavior in a bi-layer material system is a complex phenomenon and current analytical and numerical techniques are unable to describe its physical behavior when environmental effects, such as moisture, are present. The objective of this research project is to develop an experimentally validated new simulation technique in order to understand the fracture behavior of bi-layer materials under the effect of moisture. The proposed research is motivated from the durability concern of epoxy-concrete systems that are widely used in retrofitting concrete structures. A framework for multi-scale simulation combining behavior at atomistic scale, and finite element method at structural level, will be developed through an optimization technique and extensive laboratory experiments.This research will significantly advance the scientific knowledge in the area of fracture mechanics in bi-layer material systems with moisture and chemical effects, and introduce a new paradigm in engineering analysis of complex material systems. Application and development of this methodology to infrastructure problems involving bi-material systems, such as concrete and epoxy systems, will lead to a better design, reduced maintenance cost, and help ensure public safety against unanticipated structural failures. Knowledge and methodology developed in this project will be integrated into education via course curricula and made available for public through the OpenCourseware website of Massachusetts Institute of Technology and specialized research websites. Every effort will be made to involve undergraduates, females, and minority students, in the conduct of the research.

双层材料系统存在于各种应用中，从电路板中的纳米厚薄膜到建筑物中的大型结构元件。 双层材料系统中的断裂行为是一种复杂的现象，当存在湿度等环境影响时，当前的分析和数值技术无法描述其物理行为。 该研究项目的目标是开发一种经过实验验证的新模拟技术，以了解双层材料在水分影响下的断裂行为。 这项研究的动机是对广泛用于混凝土结构改造的环氧混凝土系统的耐久性问题进行研究。 通过优化技术和广泛的实验室实验，将开发一个结合原子尺度行为和结构层面有限元方法的多尺度模拟框架。这项研究将显着推进具有水分和化学效应的双层材料系统断裂力学领域的科学知识，并引入复杂材料系统工程分析的新范式。 该方法的应用和开发涉及双材料系统（例如混凝土和环氧树脂系统）的基础设施问题，将带来更好的设计，降低维护成本，并有助于确保公共安全免受意外结构故障的影响。 该项目开发的知识和方法将通过课程融入教育，并通过麻省理工学院的开放课件网站和专业研究网站向公众开放。 我们将尽一切努力让本科生、女性和少数民族学生参与研究的进行。