| Project/Area Number |
09555303
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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 |
Aerospace engineering
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
MUROZONO Masahiko Faculty of Engineering, KYUSHU UNIVERSITY,Associate Professor, 工学部, 助教授 (10190943)
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| Co-Investigator(Kenkyū-buntansha) |
SHINMOTO Yasuhisa Faculty of Engineering, KYUSHU UNIVERSITY,Reaearch Associate, 工学部, 助手 (30226352)
YAMASAKI Masahide Faculty of Engineering, KYUSHU UNIVERSITY,Research Associate, 工学部, 助手 (00038085)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥11,500,000 (Direct Cost: ¥11,500,000)
Fiscal Year 1998: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 1997: ¥6,300,000 (Direct Cost: ¥6,300,000)
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| Keywords | Laser speckle interferometry / Aerodynamic heating / Thermal deformation / Strain Measurement / High Temperature / Interference fringe / Image processing |
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| Research Abstract |
When the materials will be used at a high temperature atmosphere, the properties of the material must be matched with high temperature conditions. However, it is very difficult to measure the thermal strain in structures with existing methods, because the instrument used for strain measurement is in itself influenced by temperature. Electronic speckle pattern interferometry (ESPI) is a very useful method for measuring in-plane surface displacement. Using the cw-laser and the image processing system, it is possible to measure the displacement and strain : Unlike the traditional method for strain measurement such as the strain gauge or the moire method, the ESPI method requires no special surface preparation or the attachments and can measure the in-plane displacement with no contact and in real time. In this study, we discussed the use of ESPI for the measurement of the strain or the thermal strain of the objects at high temperature. And several methods to calculate the strain value from the interference fringe pattern were also discussed. In the experiments, the specimen was loaded in parallel with a load cell which provided the loading step. The specimen was a flat plate or a plate with a 12mm-diameter hole in its center. Strain gauges were attached to the specimen both in parallel and in normal directions to the loading direction. This study provides an example of how ESPI has been used to measure the two- dimensional displacement and strain distribution in the specimen. The results measured by using the ESPI were comparable with the data which were obtained by the strain-gauge method in tensile testing.
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