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

合作研究：基于高度非线性动力学的新型 NDE/SHM 方法

• 批准号: 0825345
• 负责人: Chiara Daraio
• 金额: --
• 依托单位: California Institute of Technology
• 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 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0825345&HistoricalAwards=false
• 关键词: Collaborative; Research; 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.

本研究将开发一个实验研究计划，以创建基于高度非线性孤立波（HNSW）的材料和结构的无损评估和结构健康监测（NDE/SHM）的新范式。该研究利用高度非线性系统的可调性，开辟了一个新的理论和实验研究领域，旨在：a）理解高度非线性振子和线性结构之间的耦合; B）检测从微观到宏观的跨尺度缺陷; c）评估给定系统中的外加应力; d）分析系统的非线性特性。d）表征材料的机械性能，在数值建模的辅助下定制传播过程中的脉冲性能（逆方法），以及e）设计新的、因此可获得专利的用于应力波产生和检测的致动器/传感器技术。 在过去的二十年中，弹性应力波（包括声波和超声范围内）的NDE/SHM的研究和应用蓬勃发展，由于其评估材料的弹性性能和损伤的存在的能力。 近年来，高度非线性波动理论的发现和发展及其数值和实验验证为NDE/SHM界提供了一种新的工具。 工程系统的健全性对于避免灾难性故障至关重要，灾难性故障可能伴随着对环境的严重后果，可能导致人类生命的损失，并产生大量的拆除废物。 因此对国家来说至关重要？NDE/SHM的可持续性，经济增长和安全性，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。 通过拟议的研究，我们计划深入研究与材料和结构耦合的高度非线性波的基本理解，提供直接机会将该技术转移到可行的商业应用中，大大改善了NDE/SHM的最先进的致动/传感技术。 这项工作建立在匹兹堡大学和加州理工学院的互补专业知识的基础上，并将在两个机构之间建立坚实的研究合作。 该计划将培养研究生和本科生的新方法，以可持续的工程解决方案。