Monitoring of damage evolution in carbon fiber reinforced polymer composites by electrical impedance tomography

IF 4.1 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Ndt & E International Pub Date : 2024-09-16 DOI:10.1016/j.ndteint.2024.103239

Xiaoying Cheng , Junling Liu , Kehong Zheng , Zhenyu Wu , Lin Shi , Xudong Hu

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Abstract

Electrical impedance tomography (EIT) has been widely investigated as a nondestructive testing method for carbon fiber reinforced polymer (CFRP) composites. However, the performance of EIT method on the damage process monitoring of the composites is lack of investigation. Herein, quasi-static indentation tests were utilized to introduce damage on CFRP laminates. The damage evolution process was monitored by EIT, while the potential of distinguishing the elastic deformation stage from the plastic stage was analyzed with the aid of acoustic emission. It was found that the changes in conductivity first appeared in the non-central region. With the accumulation of damage, the conductivity changes gradually extended to the center region. The reconstructed damage images were in the crossover shape, which was consist with the micro-CT results that showed the fracture of fibers in ±45° direction. This work further promotes the application of EIT in damage process monitoring of CFRP components.

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通过电阻抗断层扫描监测碳纤维增强聚合物复合材料的损伤演变

电阻抗断层扫描（EIT）作为碳纤维增强聚合物（CFRP）复合材料的一种无损检测方法已得到广泛研究。然而，电阻抗层析成像法在复合材料损伤过程监测方面的性能还缺乏研究。在此，利用准静态压痕测试对 CFRP 复合材料引入损伤。利用 EIT 监测了损伤演变过程，并借助声发射分析了区分弹性变形阶段和塑性阶段的潜力。研究发现，电导率的变化首先出现在非中心区域。随着损伤的累积，电导率的变化逐渐扩展到中心区域。重建的损伤图像呈交叉状，这与显微 CT 结果一致，后者显示纤维断裂方向为 ±45°。这项工作进一步推动了 EIT 在 CFRP 组件损伤过程监测中的应用。

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来源期刊

Ndt & E International 工程技术-材料科学：表征与测试

CiteScore

7.20

自引率

9.50%

发文量

121

审稿时长

55 days

期刊介绍： NDT&E international publishes peer-reviewed results of original research and development in all categories of the fields of nondestructive testing and evaluation including ultrasonics, electromagnetics, radiography, optical and thermal methods. In addition to traditional NDE topics, the emerging technology area of inspection of civil structures and materials is also emphasized. The journal publishes original papers on research and development of new inspection techniques and methods, as well as on novel and innovative applications of established methods. Papers on NDE sensors and their applications both for inspection and process control, as well as papers describing novel NDE systems for structural health monitoring and their performance in industrial settings are also considered. Other regular features include international news, new equipment and a calendar of forthcoming worldwide meetings. This journal is listed in Current Contents.