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素。 双层材料系统中的断裂行为是一种复杂的现象，当存在环境影响（例如水分）时，当前的分析和数值技术无法描述其身体行为。 该研究项目的目的是开发一种经过实验验证的新仿真技术，以了解水分作用下双层材料的断裂行为。 拟议的研究是由于环氧混凝土系统的持久性关注而动机，这些系统广泛用于改造混凝土结构。 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. 将这种方法的应用和开发用于涉及双重系统的基础设施问题，例如混凝土和环氧系统，将导致更好的设计，降低维护成本，并帮助确保公共安全，以防止意外的结构故障。 该项目中开发的知识和方法将通过课程课程纳入教育，并通过马萨诸塞州技术研究所和专业研究网站的OpenCourseware网站公开提供公开服务。 将尽一切努力使本科生，女性和少数族裔学生参与研究。