| Project/Area Number |
16360055
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Osaka University |
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Principal Investigator |
KUBO Shiro Osaka University, Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (20107139)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAGAMI Takahide Osaka University, Graduate School of Engineering, Associate Professor, 大学院工学研究科, 助教授 (50192589)
IOKA Seiji Osaka University, Graduate School of Engineering, Research Associate, 大学院工学研究科, 助手 (50283726)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥15,100,000 (Direct Cost: ¥15,100,000)
Fiscal Year 2006: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 2005: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥7,200,000 (Direct Cost: ¥7,200,000)
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| Keywords | Inverse Problem / Electric Potential Method / Nondestructive Evaluation / Composite Materials / Delamination / Smart Material / Crack Identification / Fracture Mechanics / 復号材料 / 非被壊検査 |
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| Research Abstract |
The present study deals with the development of the active and passive defect monitoring system using the piezoelectric material: the electric potential distribution is passively obtained on the piezoelectric film without application of an electric current and also supersonic wave is actively emitted from the piezoelectric film, and the responses are used for defect identification using the inverse analysis. The major results obtained are summarized as follows.
1. For the construction of the passive electric potential CT (computed tomography) method, an inverse analysis scheme was proposed for identification of cracks from the electric potential distribution observed on the piezoelectric film. It was found that the method is applicable to identification of a three-dimensional crack, and estimation of crack location, size and numbers of through-thickness plural cracks, even when the interaction between electric potentials was significant.
2. The passive electric potential CT method was applied to the identification of defect in composite materials. The effect of the delamination on the electric potential on piezoelectric film pasted on the composite materials was examined using the finite element method. It was found that the method is applicable to the reasonable estimation of the location and size of the delaminations.
3. For the construction of the passive/active electric potential CT method, a smart sensor and devices were developed which can be used for both for the passive and the active identification of defects. Using the sensor the supersonic waves were emitted. The effect of the location of sensor and the crack was examined. It was found that the crack can be identified from the supersonic wave response obtained by the sensor.
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