Shin Chow-Shing, Huang Shun-Hsuan
Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan.
Polymers (Basel). 2024 Aug 22;16(16):2374. doi: 10.3390/polym16162374.
The widely used adhesive joining technique suffers from the drawback of being unable to be dismantled to examine for degradation. To counteract this weakness, several structural health monitoring (SHM) methods have been proposed to reveal the joint integrity status. Among these, doping the adhesive with carbon nanotubes to make the joint conductive and monitoring its electrical resistance change is a promising candidate as it is of relatively low cost and easy to implement. In this work, resistance change to monitor fatigue debonding of composite single-lap adhesive joints has been attempted. The debonded area, recorded with a liquid penetrant technique, related linearly to the fatigue life expended. However, it correlates with the resistance change in two different trends. Scanning electron microscopy on the fracture surface reveals that the two trends are associated with distinct failure micromechanisms. Implications of these observations on the practical use of the resistance change for SHM are discussed.
广泛使用的胶粘剂连接技术存在无法拆卸以检查降解情况的缺点。为了克服这一弱点，人们提出了几种结构健康监测（SHM）方法来揭示接头的完整性状态。其中，在胶粘剂中掺杂碳纳米管以使接头导电并监测其电阻变化是一个有前景的选择，因为它成本相对较低且易于实施。在这项工作中，尝试通过电阻变化来监测复合材料单搭接胶粘剂接头的疲劳脱粘情况。用液体渗透技术记录的脱粘面积与消耗的疲劳寿命呈线性关系。然而，它与电阻变化呈现两种不同的趋势。断口表面的扫描电子显微镜显示，这两种趋势与不同的失效微观机制相关。讨论了这些观察结果对电阻变化在结构健康监测实际应用中的意义。
