Electric Resistance Change Method for Cure/Strain/Damage Monitoring of CFRP Laminates

A. Todoroki, "Electric Resistance Change Method for Cure/Strain/Damage Monitoring of CFRP Laminates", Key Engineering Materials, Vols. 270-273, pp. 1812-1820, 2004

Online since:

August 2004

Authors:

Akira Todoroki

Keywords:

Carbon Fiber Reinforced Polymer/Plastic (CFRP), Cure, Damage, Electric, Laminates, Monitoring, Resistance, Strain

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References

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Paper TitlePages

Application of Electric Resistance Change Method to Damage Detection of CFRP Bolted Joints

Authors: Yoshinobu Shimamura, Keiko Oda, Akira Todoroki, Hideo Kobayashi, Takaomi Inada

Abstract: Bolted joints are widely used for composite structures. As is well known, excessive bearing load gives rise to bearing failure at hole boundaries. Detecting bearing failure is important for assuring integrity of composite structures. Conventional nondestructive inspection methods are expensive, cumbersome, time-consuming, and not suitable for health monitoring, and a simple, low-cost inspection method for bearing failure must be developed. Authors have experimentally demonstrated detection bearing failure by an electrical resistance change method. In this study, detectablity of remote damage, which includes bearing failure, using an electric resistance change method is investigated analytically. The results show that fiber breaking and delamination induce permanent increase in the electric resistance of the bolted composite joints, and that the proposed method, which involves measuring electric resistance, is effective for detecting bearing failure.

653

Wireless Strain Monitoring of CFRP Laminates Using Electric Resistance Change with Oscillating Circuit

Authors: Roysuke Matsuzaki, Akira Todoroki

Abstract: To identify a delamination crack in a CFRP laminate wirelessly, we proposed an electric resistance change method with oscillating circuit in the previous study. Although the method detects the delamination creation, it cannot monitor condition of applied strain before delamination creation because the electric resistance change due to strain changing is quite small. In the present study, a bridge circuit, two amplifiers and voltage-controlled oscillator are added to sensing circuit so that it can monitor very little change of the electric resistance change. Using proposed strain sensing system, the electric resistance change and oscillating frequency change due to strain changing are experimentally measured. As a result, the method is found to successfully monitor the applied strain.

1415

Diagnostic Method for Delamination Monitoring of CFRP Plate Using Kriging Interpolation Method

Authors: Atsushi Iwasaki, Akira Todoroki, Satoshi Izumi, Shinsuke Sakai

Abstract: The present paper proposes a new diagnostic tool for the structural health monitoring that employs a Kriging Interpolation. Structural health monitoring is a noticeable technology for aged civil structures. Most of the structural health monitoring systems adopts parametric method based on modeling or non-parametric method such as artificial neural networks or response surfaces. The conventional methods require FEM modeling of structure or a regression model. This modeling needs judgment of human, and it requires much costs. The present method does not require the process of modeling, in order to identify the damage level using the discriminant analysis. This suggest us, this technique is applicable to the health monitoring system, which identifies the damage of the structure, easily. In the present paper, we developed the damage diagnostic methods using Kriging method for identifying delamination from data. Kriging method is a interpolation technique which shown in geostatistic. We applied this method to identifications of delamination crack of CFRP structure. Delamination cracks are invisible and cause decrease of compression strength of laminated composites. Therefore, health-monitoring system is required for CFRP laminates. The present study adopts an electric potential method for health monitoring of graphite/epoxy laminated composites. The electric potential method does not cause strength reduction and can be applied existing structures by low cost. As a result, it was shown that this method is effective for identification of damages.

1422

Statistical Damage Detection of Laminated CFRP Beam Using Electrical Resistance Change Method

Authors: Kosuke Takahashi, Akira Todoroki, Yoshinobu Shimamura, Atsushi Iwasaki

Abstract: Statistical diagnosis using electrical resistance changes is performed to detect a delamination crack in a CFRP beam. This method enables to reduce data required for damage identification. First, a new measuring method of multiple electrical resistance changes is proposed to perform statistical diagnosis. The proposed method measures electrical resistance changes of multiple segments in a CFRP beam although electrical interference must be considered when multiple voltages are charged at once. Next, statistical diagnosis is performed on loading to the CFRP beam. A delamination crack is detected by the change of relative relationship between multiple electrical resistance changes due to damage occurring. As a result, the monitored states of the CFRP beam are diagnosed exactly by the proposed damage detection system.

2337

Effect of Dent on Self-Sensing Method of CFRP

Authors: Akira Todoroki, Roysuke Matsuzaki, Yusuke Samejima, Yoshiyasu Hirano

Abstract: Authors’ group has been done researches on the damage monitoring of the laminated Carbon Fiber Reinforced Plastic (CFRP) using the electrical resistance change method. The method adopts reinforcement carbon fibers as sensors, and it is called self-sensing method. Using thin CFRP laminates, delamination crack location and dimension are identified with the electrical resistance change method. However, the electrical resistance decreases when a delamination crack is made in a thick CFRP beam. The present paper experimentally investigates the effect of the dent for the measurements of electrical resistance change. Indentation tests are performed for the thick CFRP plates. The effect of the dent is calculated compared with the effect of piezoresistivity caused by the residual stress relief. As a result, the effect of the dent is larger than the effect of the residual stress relief for the thick CFRP. For the thick CFRP, dents cause the significant reduction of the electrical resistance in the thickness direction, and that causes electrical resistance decrease.

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