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.

0129025lynchthis Award支持克里斯托弗·林奇（Christopher Lynch）和佐治亚理工学院的学生与德国达姆斯塔特技术大学材料系的Juergen Roedel合作。 国际项目的目的是设计与当今使用的铁电陶瓷的脆性不那么脆弱，更可靠。 这将需要详细了解电气和机械负载下的准静态和疲劳裂纹特性。 为了改善材料特性，必须完全了解其失败的机制。 美国集团开发了有限的计算机代码，能够确定铁电材料中的应力和电场浓度。 德国组开发了实验技术和专门的固定装置，用于测量在组合电气和机械负载下脆性材料的裂纹传播行为。 通过汇集两组的优势，新的分析技术和新的实验技术将使人们能够充分理解锆石钛酸铅（PZT）中的断裂过程，这反过来又将阐明微结构在骨折过程中的作用。 该工作计划规定，研究生在国际旅行和研究中进行了广泛的参与。