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Impact Damage Detection in CFRP Composite via Electrical Resistance Tomography by Means of Statistical Processing
Journal of Nondestructive Evaluation ( IF 2.6 ) Pub Date : 2020-04-22 , DOI: 10.1007/s10921-020-00677-2
Jan Cagáň , Lenka Michalcová

This study assesses the damage-detection capability of electrical resistance tomography for carbon fiber-reinforced polymer composites damaged by barely visible impact damage. Although electrical resistance tomography suffers from low spatial resolution, the method is sensitive to small conductivity changes and is therefore a suitable tool for detection of point inhomogeneity. For assessment purposes, a set of rectangular specimens were damaged by barely visible impact damage at various energies. From reconstructed images of the conductivity changes, the amplitudes and position errors for different image priors were evaluated. Amplitudes were related to the area of the delamination obtained by C-scan and assessed statistically by probability-of-detection curves. The impacts were also compared with drilled thru-holes on specimens with the same configuration. The results indicate that electrical resistance tomography is able to detect the delamination area caused by barely visible impact damage in this particular laboratory case using the amplitude of the center of gravity. The presented amplitude sensitivity, together with the position error, allows the electrical resistance tomography to be considered as a tool for structural health monitoring for early detection of barely visible impact damage what provides suggestions for further research. The performed study is the first one this comprehensive because of the number of specimens, which goes toward a statistical assessment of the electrical resistance tomography detection capability.

中文翻译:

CFRP复合材料的冲击损伤检测基于电阻层析的统计处理

本研究评估了电阻层析成像对因几乎不可见的冲击损伤而损坏的碳纤维增强聚合物复合材料的损伤检测能力。尽管电阻层析成像的空间分辨率较低,但该方法对微小的电导率变化很敏感,因此是检测点不均匀性的合适工具。出于评估目的,一组矩形试样在各种能量下受到几乎不可见的冲击损坏。根据电导率变化的重建图像,评估了不同图像先验的幅度和位置误差。振幅与通过 C 扫描获得的分层面积相关,并通过检测概率曲线进行统计评估。冲击还与在具有相同配置的试样上钻通孔进行了比较。结果表明,电阻断层扫描能够使用重心的振幅检测在这个特定的实验室案例中几乎不可见的冲击损坏造成的分层区域。所呈现的幅度灵敏度以及位置误差允许电阻断层扫描被视为结构健康监测的工具,用于早期检测几乎不可见的撞击损坏,为进一步研究提供建议。所进行的研究是第一个如此全面的研究,因为样本数量多,可对电阻断层扫描检测能力进行统计评估。结果表明,电阻断层扫描能够使用重心的振幅检测在这个特定的实验室案例中几乎不可见的冲击损坏造成的分层区域。所呈现的幅度灵敏度以及位置误差允许电阻断层扫描被视为结构健康监测的工具,用于早期检测几乎不可见的撞击损坏,为进一步研究提供建议。所进行的研究是第一个如此全面的研究,因为样本数量多,可对电阻断层扫描检测能力进行统计评估。结果表明,电阻断层扫描能够使用重心的振幅检测在这个特定的实验室案例中几乎不可见的冲击损坏造成的分层区域。所呈现的幅度灵敏度以及位置误差允许电阻断层扫描被视为结构健康监测的工具,用于早期检测几乎不可见的撞击损坏,为进一步研究提供建议。由于样本数量多,所进行的研究是第一个如此全面的研究,这对电阻断层扫描检测能力进行了统计评估。所呈现的幅度灵敏度以及位置误差允许电阻断层扫描被视为结构健康监测的工具,用于早期检测几乎不可见的撞击损坏,为进一步研究提供建议。所进行的研究是第一个如此全面的研究,因为样本数量多,可对电阻断层扫描检测能力进行统计评估。所呈现的幅度灵敏度以及位置误差允许电阻断层扫描被视为结构健康监测的工具,用于早期检测几乎不可见的撞击损坏,为进一步研究提供建议。所进行的研究是第一个如此全面的研究,因为样本数量多,可对电阻断层扫描检测能力进行统计评估。
更新日期:2020-04-22
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