Collaborative Reseach: Novel NDE/SHM Approach Based on Highly Nonlinear Dynamics

协作研究：基于高度非线性动力学的新型 NDE/SHM 方法

• 批准号: 0825983
• 负责人: Piervincenzo Rizzo
• 金额: $ 22万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0825983&HistoricalAwards=false
• 关键词: Collaborative; Reseach; Novel; NDE; SHM

This research will develop an experimental research program to create a new paradigm for Non Destructive Evaluation and Structural Health Monitoring (NDE/SHM) of materials and structures based on Highly Nonlinear Solitary Waves (HNSWs). The proposed research leverages on the tunability provided by highly nonlinear systems to open up a new field of theoretical and experimental investigations aimed at: a) understanding the coupling between a highly nonlinear oscillators and linear structures; b) detecting defects across scales: from the micro- to the macro-scopic level; c) evaluating applied stress in a given system; d) characterizing the mechanical properties of materials tailoring the pulse properties during propagation (inverse approach) aided by numerical modeling, and e) designing new, and therefore patentable, actuators/sensors technology for stress wave generation and detection. In the last two decades researches and applications of elastic stress waves (both in the sonic and ultrasonic range) for NDE/SHM have thrived owing to their capability of assessing the elastic properties of materials and the presence of damage. The recent discovery and development of the highly nonlinear wave theory and its numerical and experimental validation offer a new tool to the NDE/SHM community. The soundness of engineering systems is essential to avoid catastrophic failures that may be accompanied by severe consequences for the environment, can lead to the loss of human life, and produce tonnage of demolition waste. It is therefore of paramount importance to the nation?s sustainability, economy growth and safety that NDE/SHM, to be able to accurately detect defects at early stages or to characterize the mechanical properties of a given structure. With the proposed research we plan to delve in the fundamental understanding of highly nonlinear waves coupling with materials and structures, offering a direct opportunity to transfer the technology in viable commercial applications much improved over the state-of-the-art actuating/sensing technology for NDE/SHM. The work builds on complementary expertise at the University of Pittsburgh and the California Institute of Technology Caltech and will establish a solid research collaboration between the two institutions. The program will train graduate and undergraduate student to a new approach to sustainable engineering solutions.

这项研究将开发一项实验研究计划，以创建基于高度非线性孤立波（HNSWS）的材料和结构的非破坏性评估和结构健康监测（NDE/SHM）的新范式。拟议的研究利用了高度非线性系统提供的可调性，以开放一个新的理论和实验研究领域，旨在：a）理解高度非线性振荡器与线性结构之间的耦合； b）跨尺度检测缺陷：从微观到宏观水平； c）评估给定系统中的应用应力； d）表征在传播过程中定制脉冲特性的材料的机械性能（反向方法），并通过数值建模为e）设计新的，因此可以专利的执行器/传感器技术，用于应力波的产生和检测。 在过去的二十年中，NDE/SHM的弹性应力波（无论是在声音和超声波范围内）的研究和应用，由于它们能够评估材料的弹性特性和损害的存在，因此蓬勃发展。 高度非线性波理论及其数值和实验验证的最新发现和发展为NDE/SHM社区提供了新的工具。 工程系统的健全性对于避免可能伴随着对环境的严重后果，可能导致人类生命的损失并产生拆除浪费的吨位至关重要。 因此，NDE/SHM能够在早期阶段准确检测缺陷或表征给定结构的机械性能，这对国家的可持续性，经济增长和安全至关重要。 通过拟议的研究，我们计划深入研究对高度非线性波与材料和结构相连的基本理解，从而为在可行的商业应用中传输技术的直接机会比NDE/SHM的最先进的促进/感应技术得到了巨大改进。 这项工作以匹兹堡大学和加利福尼亚理工学院加州理工学院的补充专业知识为基础，将在两个机构之间建立可靠的研究合作。 该计划将培训毕业生和本科生，从而采用可持续工程解决方案的新方法。