Damage detection of CFRP laminates using electrical resistance measurement and neural network
Damage detection of CFRP laminates using electrical resistance measurement and neural network
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DOI：
10.1016/s0263-8223(00)00016-7
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发表时间：
1999-12
影响因子：
6.3
通讯作者：
D. Seo;Jung-Ju Lee
中科院分区：
文献类型：
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作者：
D. Seo;Jung-Ju Lee
由于碳纤维是电导体，电阻的测量似乎是一种有价值的技术，用于原位检测碳纤维增强聚合物（CFRP）层压板中的各种类型的损伤。在这种情况下，碳纤维既是增强材料，也是检测CFRP层压板损伤的传感器。本研究所探讨的电阻法CFRP层板损伤检测方法，是在CFRP结构表面贴附电极而不需特殊制作的方法。在本文中，我们调查的电阻变化作为疲劳损伤的损伤参数，如剩余强度和刚度的退化。在疲劳测试期间测得的刚度和电阻变化显示出非常相似的变化趋势。这是因为累积疲劳损伤表现为残余刚度的降低;这些损伤也会引起电阻的变化。因此，我们可以使用电阻的这种变化作为损伤参数。通过刚度退化模型，从电阻损伤模型预测了复合材料层合板在疲劳载荷作用下的损伤。电阻随着刚度的降低而逐渐增加，并且当最终疲劳失效即将来临时显示出非常突然的变化。预测值与实验数据吻合良好，但在最后阶段，刚度和电阻突然变化。
As carbon fibers are electrical conductors, the measurement of the electrical resistance appears to be a valuable technique for the in situ detection of various types of damage in carbon fiber reinforced polymers (CFRP) laminates. In such cases, carbon fibers are both the reinforcement and the sensor to detect damage in CFRP laminates. The damage-detecting method of CFRP laminates by electrical resistance measurement that are investigated in this study is made possible by attaching electrodes on the surface of the CFRP structures without special manufacturing. In this paper, we investigate the electrical resistance change as a damage parameter of fatigue damage such as the degradation of residual strength and stiffness. The measured stiffness and electrical resistance change during fatigue tests showed a very similar trend of change. This is because cumulative fatigue damage is represented by the degradation of residual stiffness; these damages also cause change in electrical resistance. Thus, we can use this change in electrical resistance as a damage parameter. We also predict the future damage of composite laminates in fatigue loading from electrical resistance damage model by following a stiffness degradation model. Electrical resistance gradually increased as the stiffness reduced, and showed a very abrupt change when final fatigue failure was imminent. The predicted value showed good agreement with the experimental data except in the final stage, where stiffness and electrical resistance changed abruptly.