Detection of CFRP-concrete interfacial debonding using active microwave thermography

Zou Xingxing; Mirala Ali; Sneed Lesley H.; Al Qaseer Mohammad Tayeb; Donnell Kristen

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Detection of CFRP-concrete interfacial debonding using active microwave thermography

机译：使用活性微波热定貌检测CFRP - 混凝土界面剥离

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Active microwave thermography (AMT), a thermographic technique that utilizes a microwave-based thermal excitation, is proposed as an efficient technique for non-contact, real-time inspection of embedded flaws. This study examines the use of AMT to detect interfacial debonding of the carbon fiber reinforced polymer (CFRP)-concrete interface. CFRP-concrete interfacial damage is caused by external mechanical loading and monitored under AMT. CFRP strips bonded to concrete prisms are tested in direct shear to initiate debonding. AMT is used to monitor the CFRP surface thermal profile in an attempt to detect and monitor interfacial damage. Correlations between the mechanical response (namely, applied load vs. composite displacement relative to the substrate, i.e., slip) and AMT results (namely, temporal CFRP thermal response) are found. High thermal contrast, TC, defined as the CFRP surface thermal response caused by loading, is observed where interfacial debonding initiates and propagates along the bonded length. An increase in the TC slope occurs when a load drop occurs, which indicates local debonding occurrence or mobilization. At different load levels, the interfacial slip and surface temperature distributions along the bonded length show similar trends. These correlations indicate that initiation and propagation of CFRP-concrete interfacial damage can be monitored by the AMT technique.

机译：有源微波热成像（AMT），一种利用基于微波的热激励的热敏技术，被提出为嵌入缺陷的非接触式实时检查的有效技术。本研究探讨了使用AMT检测碳纤维增强聚合物（CFRP）的界面脱晶 - 控制界面。 CFRP - 混凝土界面损伤是由外部机械载荷和在AMT下监测引起的。 CFRP与混凝土棱镜的条带进行直接剪切以启动剥离。 AMT用于监测CFRP表面热调，试图检测和监测界面损坏。找到机械响应（即，施加的载荷与基板，I.，SLIP）和AMT结果（即，临时CFRP热响应）之间的相关性的相关性。观察到高热对比，定义为由装载引起的CFRP表面热响应，其中界面剥离引发并沿键合长度传播。当发生负载下降时，发生了TC斜率的增加，这表明了局部剥离发生或动员。在不同的载荷水平下，沿粘合长度的界面滑动和表面温度分布显示出类似的趋势。这些相关性表明，可以通过AMT技术监测CFRP-混凝土界面损伤的启动和传播。

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来源
《Composite Structures》 |2021年第3期|113261.1-113261.12|共12页
作者
Zou Xingxing; Mirala Ali; Sneed Lesley H.; Al Qaseer Mohammad Tayeb; Donnell Kristen;
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作者单位

Missouri Univ Sci & Technol Dept Civil Architectural & Environm Engn 1401 North Pine St Rolla MO 65409 USA;

Missouri Univ Sci & Technol Dept Elect & Comp Engn Microwave Sensing Sense Lab 141 Emerson Elect Co Hall 301 W 16th St Rolla MO 65409 USA;

Missouri Univ Sci & Technol Dept Civil Architectural & Environm Engn 1401 North Pine St Rolla MO 65409 USA;

Iowa State Univ Ctr Nondestruct Evaluat CNDE Dept Elect & Comp Engn 2215 Coover Hall 2520 Osborn Dr Ames IA 50011 USA;

Missouri Univ Sci & Technol Dept Elect & Comp Engn Microwave Sensing Sense Lab 141 Emerson Elect Co Hall 301 W 16th St Rolla MO 65409 USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
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关键词
Active microwave thermography (AMT); Carbon fiber reinforced polymer (CFRP) composite; Interfacial debonding; Single-lap direct shear test;

机译：活性微波热量成像（AMT）;碳纤维增强聚合物（CFRP）复合材料;界面剥离;单圈直接剪切测试;

Detection of CFRP-concrete interfacial debonding using active microwave thermography

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