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On the detectability of transverse cracks in laminated composites using electrical potential change measurements

机译：利用电势变化测量层压复合材料中横向裂纹的可检测性

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摘要

Real-time health monitoring of structures made of laminated composites is necessary as significant damage may occur without any visible signs on the surface. Inspection by electrical tomography (ET) seems a viable approach that relies on voltage measurements from a network of electrodes across the inspected domain to infer conductivity change within the bulk material. If conductivity decreases significantly with increasing damage, the obtained conductivity map can be correlated to the degradation state of the material. We focus here on detection of transverse cracks. As transverse cracks modify the in-plane transverse conductivity of a single ply, we expect them to be detectable by electrical measurements. Yet, the quality of detection is directly related to the sensitivity of the measurements to the presence of cracks. We use numerical experiments to demonstrate that the sensitivity depends on several material and geometrical parameters. Based on the results, the applicability of ET to detect transverse cracks is discussed. One conclusion from the study is that detecting transverse cracks using ET is more reliable in some laminate configurations than in others. Recommendations about the properties of either the pristine material or the inspected structures are provided to establish if ET is reliable in detecting transverse cracks. (C) 2014 Elsevier Ltd. All rights reserved.
机译：必须对由层压复合材料制成的结构进行实时健康状况监控，因为可能会发生严重损坏，并且表面上没有任何可见的迹象。通过电子断层扫描（ET）进行检查似乎是一种可行的方法，该方法依赖于跨检查区域的电极网络进行电压测量，以推断散装材料中的电导率变化。如果电导率随着损伤的增加而显着降低，则获得的电导率图可以与材料的降解状态相关。我们在这里集中于横向裂缝的检测。由于横向裂纹会改变单层的平面内横向电导率，因此我们希望通过电学测量可以检测到它们。然而，检测的质量直接与测量对裂纹存在的敏感性有关。我们使用数值实验来证明灵敏度取决于几种材料和几何参数。在此基础上，讨论了电渗流在横向裂纹检测中的适用性。该研究的一个结论是，在某些层压板配置中，使用ET检测横向裂纹比其他层压板更为可靠。提供有关原始材料或检查结构的性能的建议，以确定ET在检测横向裂纹方面是否可靠。 （C）2014 Elsevier Ltd.保留所有权利。

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  • 来源
    《Composite Structures》 |2015年第3期|237-246|共10页
  • 作者

    Selvakumaran Lakshmi; Long Quan; Prudhomme Serge; Lubineau Gilles;

  • 作者单位

    King Abdullah Univ Sci & Technol, Phys Sci & Engn Div, COHMAS Lab, Thuwal 239556900, Saudi Arabia;

    King Abdullah Univ Sci & Technol, Comp Elect & Math Sci & Engn Div, Thuwal 239556900, Saudi Arabia|Univ Texas Austin, Inst Computat Engn & Sci, Austin, TX 78712 USA;

    Ecole Polytech, Dept Math & Ind Engn, Montreal, PQ H3C 3A7, Canada;

    King Abdullah Univ Sci & Technol, Phys Sci & Engn Div, COHMAS Lab, Thuwal 239556900, Saudi Arabia;

  • 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
  • 中图分类
  • 关键词

    Transverse cracking; Sensitivity; Electrical tomography; Analytical model; Laminated composites;

    机译：横向开裂敏感性电层析成像分析模型层状复合材料;

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