History Memorable Monitoring System for Composites using Electrical Impedance Changes

碳纤维增强复合材料(CFRP)层合板在许多航空航天结构中得到了应用。采用了几种CFRP层压板的加工方法来制作CFRP结构。复合材料结构的固化监测对于质量控制和提高结构的力学性能至关重要。养护后，对CFRP结构进行应变监测，以确定加工的完整性，以及振动监测和外加应力监测，以了解外荷载的情况。由于分层是不可见的或肉眼难以检测到的，导致一次结构的可靠性较低。为了改善低可靠性，需要使用智能分层识别系统。建立一个结构健康监测系统来监测脱层是理想的方法之一。当碳纤维增强塑料燃料箱中发生大量基质开裂时，基质开裂只会导致燃油泄漏。矩阵…的这些损伤更多的裂纹和分层对航空航天应用具有重要意义。近年来，采用电阻抗变化法来检测碳纤维复合材料层合板的内部损伤。这种改变电阻的方法不需要昂贵的仪器。由于该方法采用增强碳纤维本身作为传感器，不会造成强度降低，适用于现有的CFRP结构，因此，本研究采用电阻抗变化法对固化监测、应变监测、基质裂缝监测和分层监测的传感器进行了研究。这些成功的结果使我们能够在许多应用中通过电阻和电容的变化来监测CFRP层合板的大量信息。这里不仅给出了个别的成功结果，还提出了一种新的统一的变阻抗方法概念。采用面向对象的程序设计系统对复合材料进行分析。“复合材料”类在这里被设计来表示复合材料和目标复合材料组件的历史。使用电阻抗变化法监测的所有固化施加的应变和损伤信息都输入到“复合材料”类的存储器中。通过电阻抗变化法，我们可以得到复合材料部件的个人简历。较少

Carbon Fiber Reinforced Polymer (CFRP) laminates are applied to many aerospace structures. Several processing methods of the CFRP laminates have been adopted to fabricate the CFRP structures. Cure monitoring of composite structures is crucial for quality control and improvement of mechanical properties of structures. After curing, strain monitoring of the CFRP structures is very important to confirm integrities of processing, as well as vibration monitoring and applied stress monitoring to know the condition of the external loading. Since the delamination is invisible or difficult to detect by visually, the delamination causes low reliability for primary structures. To improve the low reliability, smart systems of delamination identifications in-service are desired. A structural health monitoring system to monitor the delaminations is one of the desired approaches. Matrix cracking simply causes fuel leak when a lot of matrix cracking occurs in a CFRP fuel tank. These damages of matrix … More cracking and delaminations are significant for aerospace applications. Recently, an electrical impedance change method is employed to detect the internal damages of CFRP laminates. The electrical resistance change method does not require expensive instruments. Since the method adopts a reinforcement carbon fiber itself as a sensor, this method does not cause reduction of strength, and it is applicable to existing CFRP structures.In the present research, therefore, the electrical impedance change method is adopted for sensors of cure monitoring, strain monitoring, matrix crack monitoring and delamination monitoring. These successful results enable us to monitor a lot of information of the CFRP laminates by means of the electrical resistance and capacitance changes in many applications. Not only the individual successful results, a new united concept of the electrical resistance change method is proposed here. Object-oriented programming system is adopted for analyses of composites. Class "composites" is designed here to represent composite materials and history of the target composite component. All of the curing applied strain and damage information monitored using the electrical impedance change method is input in the memory of the "composite" class. By means of the electrical impedance change method, we can obtain the personal resume of the composite components. Less