810 X 線侵入深さを考慮した繊維強化材料の応力評価

概要

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The criterion of biaxial or triaxial analysis was examined with the distribution of microstresses in the fiber reinforced material by finite element method (FEM). The microstresses in the matrix phase and the long-fiber phase were generated in FEM calculation, from the thermal stresses due to the temperature deference between these two phases. Two models of different fiber arrangement were used to calculate microstress states. The correlation between the free surface effect and the distribution of microstresses both in the matrix and the fiber was investigated. The weighted average strain <ε_ψ> in the direction at the angle ψ inclined from the surface normal was calculated under the consideration of the X-ray absorption. The criterion of the biaxial and triaxial stress measurement was discussed from the <ε_ψ> sin^2 ψdiagram calculated on different volume fractions and fiber arrangements.
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