U.S.-Germany Cooperative Research: Rate Effects in the Fracture Toughness of Ferroelectric Ceramics under Mechanical Loading

美德合作研究：机械载荷下铁电陶瓷断裂韧性的速率效应

• 批准号: 0129025
• 负责人: Christopher Lynch
• 金额: $ 0.6万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-03-15 至 2005-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0129025&HistoricalAwards=false
• 关键词: U.S.; Germany; Cooperative; Research; Rate

0129025LynchThis award supports Christopher Lynch and students from Georgia Tech in a collaboration with Juergen Roedel of the Department of Material at the Technical University of Darmstadt, Germany. The aim of the international project is to design ferroelectric ceramics that are less brittle and more reliable than those used today. This will require detailed knowledge of both the quasi-static and fatigue crack properties under both electrical and mechanical loading. To improve the materials properties, the mechanisms of their failure have to be fully understood. The US group has developed a finite element computer code capable of determining stress and electric field concentrations in ferroelectric materials. The German group has developed experimental techniques and specialized fixtures for measuring the crack propagation behavior of brittle materials under combined electrical and mechanical loading. By bringing together the strengths of both groups, new analytical techniques and new experimental techniques will make possible a full understanding of the fracture process in lead zirconate titanate (PZT), which in turn will elucidate the role of microstructure in the fracture process. The work plan provides for extensive participation by graduate students in the international travel and research.

0129025Lynch该奖项支持Christopher Lynch和佐治亚理工学院的学生与德国达姆施塔特工业大学材料系的Juergen Roedel合作。这个国际项目的目标是设计出比现在使用的铁电陶瓷更不脆、更可靠的铁电陶瓷。这将需要在电气和机械载荷下的准静态和疲劳裂纹特性的详细知识。为了改善材料的性能，必须充分了解它们的失效机理。这家美国集团开发了一种有限元计算机代码，能够确定铁电材料中的应力和电场集中。这家德国集团开发了实验技术和专门的夹具，用于测量脆性材料在电气和机械联合加载下的裂纹扩展行为。通过将这两个小组的优势结合在一起，新的分析技术和新的实验技术将使人们能够全面了解锆钛酸铅(PZT)的断裂过程，这反过来将阐明微观结构在断裂过程中的作用。该工作计划允许研究生广泛参与国际旅行和研究。