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首页> 外文期刊>Journal of aerospace engineering >Improved Method to Determine Young's Modulus for Concrete Cylinder Using Electromechanical Spectrum: Principle and Validation
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Improved Method to Determine Young's Modulus for Concrete Cylinder Using Electromechanical Spectrum: Principle and Validation

机译：使用机电谱确定混凝土筒的杨氏模量的改进方法：原理和验证

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Electromechanical impedance (EMI) has been used as an in-situ nondestructive testing (NDT) method for concrete material property testing, e.g., strength and Young's modulus, for decades. However, current EMI methods for determining Young's modulus require establishing a large database of conventional compressive testing results to correlate the EMI spectrum. Although they can track the development of Young's modulus of concrete using statistical metrics, the EMI method cannot quantitively determine the Young's modulus of concrete without referring to a reference state in the baseline database. EMI physical models usually consider the contribution of the host structure as mechanical impedance which is more localized than the global mechanical properties of the structure. However, very few studies have investigated the physical relation between mechanical impedance and Young's modulus. Furthermore, the EMI spectrum is highly sensitive to the boundary condition of sensors which results in poor repeatability due to sensor variability. In this paper, a novel testing method EMI Resonance (EMI-R) is proposed and validated to quantitatively determine Young's modulus of concrete cylinders through an integrated, theoretical, and experimental study. First, the eigen frequencies of a cylinder were tested using the EMI spectrum of a single lead zirconide titanite (PZT) sensor. Then, the Young's modulus was calculated based on eigen frequencies. Finite element (FE) analysis and impact resonance (IR) tests were implemented for validation. Results showed good agreement between the newly proposed EMI resonance (EMI-R) method and the conventional IR test method. The results have confirmed that the newly proposed EMI-R method does not require any correlation of EMI spectrum to compression testing results. The influence of the variation of sensors is also diminished because of the inertness of PZT in the low frequency band. (c) 2020 American Society of Civil Engineers.
机译：机电阻抗（EMI）已被用作用于混凝土材料性能检测的原位无损检测（NDT）方法，例如强度和杨氏模量数十年。然而，用于确定杨氏模量的当前EMI方法需要建立大量传统压缩测试结果的数据库，以将EMI光谱相关联。虽然他们可以使用统计指标跟踪年轻的混凝土模量的发展，但是EMI方法不能定量地确定杨氏模量而不参考基线数据库中的参考状态。 EMI物理模型通常考虑宿主结构作为机械阻抗的贡献，该机械阻抗比结构的全局机械性能更为局部。然而，很少有研究已经调查了机械阻抗和杨氏模量之间的物理关系。此外，EMI光谱对传感器的边界条件非常敏感，这导致由于传感器变异性导致的可重复性差。本文提出了一种新型测试方法EMI共振（EMI-R），通过综合，理论和实验研究定量地确定杨氏模量的混凝土模量。首先，使用单铅锆钛矿（PZT）传感器的EMI光谱测试圆柱的特征频率。然后，基于特征频率计算杨氏模量。有限元（FE）分析和冲击共振（IR）测试用于验证。结果表明，新提出的EMI共振（EMI-R）方法与常规IR试验方法之间的良好一致。结果证实，新提出的EMI-R方法不需要EMI谱与压缩测试结果的任何相关性。由于低频带中的PZT惰性，传感器变化的影响也在减小。 （c）2020年美国土木工程师协会。

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  • 来源
    《Journal of aerospace engineering》 |2020年第6期|04020079.1-04020079.11|共11页
  • 作者

    Kong Zhihao; Lu Na;

  • 作者单位

    Purdue Univ Lyles Sch Civil Engn W Lafayette IN 47907 USA;

    Purdue Univ Lyles Sch Civil Engn W Lafayette IN 47907 USA|Purdue Univ Ctr Intelligent Infrastruct W Lafayette IN 47907 USA;

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