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EAGER: Understanding Nonlinear Mechanical Behavior in Porous Infrastructure Materials

EAGER：了解多孔基础设施材料中的非线性机械行为

基本信息

批准号：
1744371
负责人：
John Popovics
金额：
$ 10万
依托单位：
University of Illinois at Urbana-Champaign
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-08-01 至 2019-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1744371&HistoricalAwards=false
关键词：
EAGER Understanding Nonlinear Mechanical Behavior

项目摘要

This EArly-concept Grant for Exploratory Research (EAGER) project will provide enhanced understanding of the mechanical response behavior of porous infrastructure materials. Porous infrastructure materials are critical to the foundations of civilized life, from underlying structural bedrock to the tallest concrete structures in the world. Societal pressures for increased material efficiency are expanding the use and specifications of these materials. In addition, improved monitoring of such materials is necessary to extend material life, safely and economically, and ensure public safety for the nation infrastructure. However, progress toward expanding design and inspection of porous infrastructure materials is hampered because some aspects of their mechanical response behavior are poorly understood. This study addresses the gaps in existing knowledge through direct observations using new experimental techniques that can shed light on the micro-seismic initiation behavior of rock, establish a new non-linear basis to interpret vibration and wave propagation responses in concrete structures for structural health monitoring, and potentially provide new insight about time dependent material behaviors including shrinkage and creep in concrete. Dynamic Mesoscale Nonlinear Elastic (DME) behaviors in porous infrastructure materials will be studied using innovative experimental measurements at two different length scales. The study is composed of the following efforts: (i) Design and carry out macroscale observations of material nonlinear DME behaviors through vibrational studies across environmental conditions; (ii) Design and carry out microscale observations of nonlinear DME behaviors through Environmental Scanning Electron Microscope (ESEM) measurements across environmental conditions; (iii) Evaluate the observations between the length scales to formulate a feasible basis for new physically-based phenomenological theory underlying DME behaviors. The findings of the work will provide unique insight and a new foundation to understand and interpret dynamic mechanical responses of a broad range of porous engineered materials, and as such offer benefits to broad swaths of the academic community.

这个早期概念探索性研究资助 (EAGER) 项目将加深对多孔基础设施材料机械响应行为的理解。从底层结构基岩到世界上最高的混凝土结构，多孔基础设施材料对于文明生活的基础至关重要。提高材料效率的社会压力正在扩大这些材料的用途和规格。此外，有必要加强对此类材料的监控，以安全、经济地延长材料寿命，并确保国家基础设施的公共安全。然而，由于人们对其机械响应行为的某些方面知之甚少，多孔基础设施材料的扩展设计和检查的进展受到阻碍。这项研究通过使用新的实验技术进行直接观察来填补现有知识的空白，这些技术可以揭示岩石的微震引发行为，建立新的非线性基础来解释混凝土结构中的振动和波传播响应以进行结构健康监测，并可能提供关于时间依赖性材料行为（包括混凝土收缩和蠕变）的新见解。将使用两种不同长度尺度的创新实验测量来研究多孔基础设施材料中的动态介观非线性弹性（DME）行为。该研究由以下工作组成：（i）通过跨环境条件的振动研究，设计并进行材料非线性 DME 行为的宏观观测； (ii) 通过环境扫描电子显微镜 (ESEM) 在各种环境条件下进行测量，设计并进行非线性 DME 行为的微观观察； (iii) 评估长度尺度之间的观测结果，为 DME 行为的新的基于物理的现象学理论制定可行的基础。这项工作的结果将为理解和解释各种多孔工程材料的动态机械响应提供独特的见解和新的基础，从而为学术界的广泛领域带来好处。