SGER: Application of Dynamic Failure Mechanics to Material and Interface Selections for Protecting Critical Structures

SGER：动态失效力学在保护关键结构的材料和界面选择中的应用

• 批准号: 0456807
• 负责人: Luoyu Xu
• 金额: --
• 依托单位: Vanderbilt University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-15 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0456807&HistoricalAwards=false
• 关键词: SGER; Application; Dynamic; Failure; Mechanics

Abstract for: SGER: Application of Dynamic Failure Mechanics to Material and Interface Selections for Protecting Critical Structures, CMS proposal 0456807PI: Luoyu Xu, Vanderbilt UniversityThe American homeland is in imminent danger of terrorist action. Although buildings, bridges, nuclear power plants and like structures might not avoid catastrophic failure in extreme events, research needs to be carried out to protect critical structures. In the case of existing structures, a quick and effective way to achieve this goal is to use structural protection systems such as composite jackets. Previous applications of composite materials to civil structures were mainly focused on structural rehabilitation under fatigue or seismic loading (i.e., low strain rate situations). Systematic studies on improving structural survivability using composite materials and other protective materials under impact or blast loading condition (high strain rate situations) have received only preliminary attention. However, fundamental scientific groundwork is still significantly lacking. The goal of this proposal is to explore the fundamentals of dynamic failure mechanism and mechanics involved in improving structural survivability using protective systems, before these systems can be extensively applied to critical structures. This objective will be implemented through real-time, small-scale model experiments of dynamic failure incorporating dynamic fracture mechanics analysis. The intellectual merit of the proposed activities is the identification of an interdisciplinary area of fundamental and practical importance. Complicated dynamic failure mechanism and mechanics can be extensively explored through carefully designed small-scale model experiments before these principles are applied to practical large-scale structures. The proposed activities will advance knowledge and understanding within the field of dynamic failure mechanics and across broader fields including composite materials and structural engineering. Since this project is focused on a highly visible research area of international importance to the general population, it is expected to lead to an immediate impact on society.

摘要：SGER：动态失效力学在保护关键结构的材料和界面选择中的应用，CMS 提案 0456807PI：许洛宇，范德比尔特大学美国本土正面临恐怖行动的迫在眉睫的危险。 尽管建筑物、桥梁、核电站和类似结构可能无法避免极端事件中的灾难性故障，但仍需要进行研究以保护关键结构。 对于现有结构，实现这一目标的快速有效的方法是使用复合材料护套等结构保护系统。 以前复合材料在土木结构中的应用主要集中在疲劳或地震载荷（即低应变率情况）下的结构修复。使用复合材料和其他防护材料在冲击或爆炸载荷条件（高应变率情况）下提高结构生存能力的系统研究仅受到初步关注。然而，基础科学基础仍然严重缺乏。 该提案的目标是在这些系统广泛应用于关键结构之前，探索使用保护系统提高结构生存能力所涉及的动态失效机制和力学的基础知识。 这一目标将通过结合动态断裂力学分析的实时、小规模动态失效模型实验来实现。 拟议活动的智力价值在于确定了具有基础和实际重要性的跨学科领域。在将这些原理应用于实际的大型结构之前，可以通过精心设计的小规模模型实验来广泛探索复杂的动态失效机制和力学。 拟议的活动将增进动态失效力学领域以及复合材料和结构工程等更广泛领域的知识和理解。 由于该项目的重点是对普通民众具有国际重要性的高度可见的研究领域，因此预计将对社会产生直接影响。