レーザホログラフィー干渉法を用いた一様モーメント負荷による直交対称積層板の曲げ弾性係数の測定

概要

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The accurate measurement of the flexural modulus of composite sheet materials is essential in the analysis of composite structures subject to bending loads. The bending of thin symmetric sandwich laminate plates is characterized by a matrix containing four independent terms. In the past, little attention has been given to the direct measurement of these terms. In the present paper, a new method is devised for loading a uniform bending moment or a uniform twisting moment to a symmetric sandwich laminate plate. Holographic interferometry was used as a means of determining the curvatures in a thin orthotropic sheet. The flexural modulus is obtained from the moment-curvature relation. Finally, the experimental result of the deformed shape for another loading condition is compared with the result of FEM using flexural stiffness terms derived from our experiment. Both results have a good agreement. Direct measurement could be the only practical means of accurately deriving the flexural stiffness terms.
1988-10-25