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从电路板中的纳米厚薄膜到建筑物中的大型结构元件的各种应用中。 双层材料系统的断裂行为是一个复杂的现象，目前的分析和数值技术无法描述其物理行为时，环境的影响，如水分，存在。 本研究项目的目的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作用下的断裂行为。 建议的研究是出于对广泛用于混凝土结构加固的环氧混凝土系统的耐久性的关注。 通过优化技术和大量的实验室实验，将发展一个结合原子尺度行为和结构层次有限元方法的多尺度模拟框架，这一研究将极大地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，并为复杂材料系统的工程分析引入一个新的范式。 这种方法的应用和发展涉及双材料系统，如混凝土和环氧树脂系统的基础设施问题，将导致更好的设计，降低维护成本，并有助于确保公众安全，防止意外的结构故障。 在该项目中开发的知识和方法将通过课程纳入教育，并通过马萨诸塞州理工学院的开放式课程网站和专门的研究网站向公众提供。 将尽一切努力让本科生、女生和少数民族学生参与研究。