Determination of Principal Strains and Simple Measurement of Poisson's Ratio by Moiré Rosette Method

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  • モアレロゼット法による主ひずみの決定とポアソン比の簡易測定
  • モアレロゼットホウ ニヨル ヌシヒズミ ノ ケッテイ ト ポアソンヒ ノ カン

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The moiré rosette method using two concentric, circular grids can be used as a mean of determining the principal strains and their directions in the case of complex strain fields. But the fundamental theory of this method has not been established yet.<br>In this paper, it is shown that the discrimination of principal axes and the determination of principal directions can be done by forming fringes with several mismatch values.<br>Further, a simple method for measuring the Poisson's ratio is presented, and its accuracy is discussed.

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