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

复合材料层合板的分层通常是不可见的或难以目测的。分层导致一次结构的可靠性较低。需要用于服务中分层识别的自动系统来改善低可靠性。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结构的静力和疲劳强度，也适用于既有结构。作者发现，带响应面的电阻变化法在实验和分析上都是非常有效的。然而，对于分层位置的估计，估计误差仍然很大。在本研究中，提出了一种新的数据处理方法来提高分层位置估计的性能。并将该方法应用于复合材料层合梁。用该方法对复合材料层合梁的脱层裂纹进行了有限元分析。结果表明，即使对于回归方程中没有使用的新数据，该方法也表现出了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.