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한국항공우주학회 한국항공우주학회지 韓國航空宇宙學會誌 第29卷 第2號
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    초록·키워드

    In this work, we investigate a measurement technique of strains and stresses using strain gage in an environment of variable temperature. The concept of a reference compensation strain gage is introduced to eliminate thermal output, or errors due to (1) the temperature dependency of electrical resistance of a grid conductor and (2) the mismatch of CTE(coefficient of thermal expansion) between a strain gage grid conductor and a test sample. We experimentally showed that the present method could measure the strains of an isotropic beam in a variable temperature environment for both free and fixed boundary conditions. Especially, for fixed condition, the values of thermal loads calculated from the measured strain data were compared with those of a load cell. This method was also applied to measure the CTE's of a carbon/epoxy composite.

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