Plug & Monitor Type Delamination Diagnostic CFRP Structure System using Electric Resistance Change Method

层压复合材料的分层通常是不可见的或难以肉眼检测到的。分层导致初级结构可靠性低。为了改善低可靠性，需要在役分层识别的自动系统。本研究采用电阻变化法进行分层检测。由于该方法采用增强碳纤维本身作为分层检测的传感器，因此该方法不会降低静强度或疲劳强度；该方法同样适用于现有结构。实验和分析结果表明，基于响应面的电阻变化法是非常有效的。然而，对分层位置的估计仍然存在较大的估计误差。为了提高分层位置估计的性能，本文提出了一种新的数据处理方法。将该方法应用于层合组合梁。采用有限元分析方法对复合材料层合梁的分层裂缝进行了监测。结果表明，即使对于回归方程中未使用的新数据，该方法也具有良好的分层位置估计性能。

Delamination of laminated composites is usually invisible or difficult to detect visually. Delamination causes low reliability for primary structures. Automatic systems for in-service delamination identifications are desired to improve low reliability. The present study employs an electric resistance change method for delamination detection. Since the method adopts reinforcement carbon fiber itself as sensors for delamination detection, this method does not reduce static or fatigue strength ; also, the method is applicable to existing structures. Authors have found that the electric resistance change method with response surfaces is very effective experimentally and analytically. However, a large error of estimation remains for estimation of delamination location. In the present study, a new data processing procedure is proposed to improve performance of estimations of delamination location. The new method is applied to laminated composite beams. A delamination crack of a laminated composite beam is monitored with the new method using FEM analyzes. As a result, the method reveals excellent performance of estimations of delamination location even for new data not used in regression equations.