| Co-Investigator(Kenkyū-buntansha) |
FUKUNAGA Hisao Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (50134664)
KAMEYAMA Masaki Tohoku University, Graduate School of Engineering, Research Associate, 大学院・工学研究科, 助手 (30302178)
KAWABATA Nariyuki Anan National College of Technology, Department of Mechanical Engineering, Research Associate, 機械工学科, 助手 (70390507)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2005: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2004: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Research Abstract |
For future high-speed vehicles, there are a lot of damages induced by external impact events, which lead to high possibility of accidents. To improve the safety and reliability of these composite structures, it is very important to automatically and non-destructively detect and monitor the damages in the meaning of real-time. In this research, for intelligent composite structures embedded with piezoelectric sensors, based on the low-frequency responses induced by impact loads, the identification technique of impact force from external bodies is developed. Meanwhile, for the prediction of damage locations and damage extents, based on the identified impact force and a numerical model, the realization of damage monitoring method is taken as purpose. From 2004〜2005, the following works have been accomplished :
1.An identification technique of impact force based on the experimental data and numerical model is developed. In this method, the Chebyshev polynomial is employed to simulate the imp
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act force history, which leads to high accuracy and high speed. Impact tests of CFRP plates have been carried out to show its effectiveness.
2.An identification method for impact force, which is only based on the experimental data, is developed.
3.For CFRP-reinforced panels and sandwich plates, the effectiveness of the above method has been verified, which illustrate very high reliability and accuracy.
4.The weight-drop tests for quasi-isotropic laminates with 32 layers have been performed. When the damages happen, the above two impact force identification methods have been proven to be effective.
5.For the evaluation of impact damages, a powerful 3D FEM model is developed. Also, to simulate the interface damages, a novel cohesive model is proposed.
6.Based on the results of the weight-drop tests for quasi-isotropic laminates with 32 layers, the effectiveness of the proposed numerical model for damage evaluation has been demonstrated. At the same time, by employing the identified impact loads and the numerical model to evaluate the damages induced by impacts, the effectiveness of this damage monitoring system for composite materials has been verified. Less
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