2002 Fiscal Year Final Research Report Summary
Development of a simple automatic measurement of the deformation or strain using a TV camera
| Project/Area Number |
12555030
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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 | SASEBO NATIONAL COLLEGE OF TECHNOLOGY |
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Principal Investigator |
FUKUDA Takayuki Department of Mechanical Engineering, Associate Professor, 機械工学科, 助教授 (10181273)
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| Co-Investigator(Kenkyū-buntansha) |
USHIJIMA Seiji DAISHIN GIKEN Co., Ltd. Technology Development Division, Researcher, 技術開発事業部, 研究員
KAWASUE Kikuhito Miyazaki University, Department of Mechanical Systems Engineering, Associate Professor, 工学部, 助教授 (20214645)
FUJIMURA Kensei Department of Mechanical Engineering, Professor, 機械工学科, 教授 (50039666)
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| Project Period (FY) |
2000 – 2002
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| Keywords | Measurement of deformation or strain / Image correlation technique / TV camera / Measurement of a large deformation / Non-contact measurement / Measurement of the strain distribution |
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| Research Abstract |
This study is the development of an automatic measurement, taken by TV camera, of the deformation of real objects. The images from a TV camera or a microscope are digitized and stored in the computer memory while the specimen is being deformed. The images recorded at different times are compared each other and the deformation is calculated automatically. Fortunately, since the magnified surface image has a characteristic pattern, it can be utilized for the adequate marking and, therefore, the manual drawing of meshes or marks on the surface is unnecessary. The cross-correlation method is used for the image processing. In the cross-correlation method, the first original image is divided into small square meshes on the computer memory. Though the size of meshes should be changed depending on the magnification of a microscope or the grain size of a specimen, in this technique the size can be changed easily without contact to the surface since the image data is processed on the computer memory.
In our experiments, static tensile and torsional tests of carbon steels are carried out. Then those specimen surfaces are locally observed. The characteristic of micro-deformations under these static loads is made clear from the results obtained by the image processing technique.
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