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首页> 外文会议>Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments >Correlation of Impedance and Compressive Stress of Carbon Nanofiber Aggregates for Structural Health Monitoring
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Correlation of Impedance and Compressive Stress of Carbon Nanofiber Aggregates for Structural Health Monitoring

机译：用于结构健康监测的纳米碳纤维集料的阻抗和压应力相关性

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A carbon nanofiber aggregate (CNFA) contains carbon nanofibers (CNFs) as an admixture of selfconsolidating mortar and produces an electrical response under stress. CNFA is a sensor that notifies the health status and provides a signal for the structural health monitoring system. It is necessary to understand the working principle and behavior of a CNFA and observe if CNFAs show consistency under various stress. In this research, three sets of test methods were tested under different loading methods to investigate the electrical impedance of CNFA under compressive stress, including the sweep-frequency test, the response from load removal, and the response from a car wheel. The behavior of CNFAs and their consistency under various loading conditions relies on the fact that they are conductive under stress. First, the sweep-frequency test compares the electrical impedance for various frequencies ranging from 1 to 500 kHz when the CNFA is scanned without the load and with a constant load. After reaching the targeted load, it is kept constant. Second, the impedance of CNFA is recorded for a constant load and a selected frequency. The electrical response of the CNFA under constant load is compared with the electrical response without any load. Third, the car wheel provides the load to the CNFA. The three methods demonstrated a positive correlation between impedance and compressive stress. The variables considered in the tests are various concentrations of CNFs and the age of samples. Irrespective of these variables, the test results from three methods show consistency in the behavior of CNFA. Therefore, the correlation between the electrical impedance and the stress is validated based on the experimental study.
机译：碳纳米纤维骨料（CNFA）包含碳纳米纤维（CNF），作为自固结砂浆的混合物，并在应力下产生电响应。CNFA是一种传感器，用于通知健康状态，并为结构健康监测系统提供信号。有必要了解CNFA的工作原理和行为，并观察CNFA在各种压力下是否表现出一致性。在本研究中，三套测试方法在不同的加载方式下进行测试，以研究压缩应力下CNFA的电阻抗，包括扫频测试、荷载移除响应和车轮响应。CNFA的行为及其在各种载荷条件下的一致性取决于它们在应力下的导电性。首先，当在无负载和恒定负载的情况下扫描CNFA时，扫描频率测试比较从1到500 kHz的各种频率的电阻抗。达到目标负载后，保持恒定。其次，记录恒定负载和选定频率下的CNFA阻抗。将CNFA在恒定负载下的电气响应与无任何负载时的电气响应进行比较。第三，车轮为CNFA提供负载。这三种方法证明了阻抗和压应力之间的正相关性。测试中考虑的变量是CNF的各种浓度和样品的年龄。不管这些变量如何，三种方法的测试结果都显示了CNFA行为的一致性。因此，在实验研究的基础上验证了电阻抗和应力之间的相关性。

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