2003 Fiscal Year Final Research Report Summary
Defect Identification by the Active and Passive Electric Potential CT (Computer Tomography) Methods Using Spatial Electromagnetic Field Measurements
| Project/Area Number |
13555027
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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 | 展開研究 |
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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) |
IOKA Seiji Osaka University, Graduate School of Engineering, Research Associate, 大学院・工学研究科, 助手 (50283726)
SAKAGAMI Takehide Osaka University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (50192589)
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| Project Period (FY) |
2001 – 2003
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| Keywords | Inverse Problem / Electric Potential Method / Nondestructive Evaluation / Composite Materials / Crack Identification / Delamination / Smart Material / Fracture Mechanics |
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| Research Abstract |
The present study deals with the development of the active and passive electric potential CT (computed tomography) methods for the identification of cracks and defects from electromagnetic field measurements based on the inverse analyses. The major results obtained are summarized as follows.
1.The applicability of the passive electric potential CT method to the identification of a through-thickness crack in a plate specimen was examined numerically and experimentally. In the presence of the crack the electric potential distribution of a piezoelectric film glued on the surface of the specimen showed characteristic two peaks. It was found that the crack can be identified from the characteristic parameters of the two peaks based on the proposed inverse analysis scheme. The method was successfully extended to the identification of an inclined crack by using a ratio of the two peaks. It was found that the crack numbers can be estimated by applying the AIC (Akaike information criterion) even when two cracks are closely located.
2.Identification of a three-dimensional surface crack breaking on the back surface by the passive electric potential CT method was examined. A characteristic potential distribution was found on the piezoelectric film which can be used for the three-dimensional crack identification.
3.The passive electric potential method was applied to the identification of of delamination in composite laminates. It was found that the interlaminar defect can be identified from the electric potential distribution on the piezoelectric film when the composites are loaded under three-point bending.
From these results the passive electric potential CT method was found applicable for quantitative identification of two-and three-dimensional cracks and defects.
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Research Products
(26 results)
