1743 負荷後繊維破断による局所的応力集中に及ぼす母材の塑性変形の影響(S16-4 複合材料(2),S16 先進材料の強度・機能評価とメゾメカニックス)

概要

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In this study, stress concentrations near loaded and initial fiber breaks are analyzed for unidirectional composites with matrix yielding and interfacial sliding. To this end, by performing detailed 3D finite element analysis, it is demonstrated that significant nonproportional stressing occurs in the matrix near loaded fiber breaks in contrast to initial breaks, and that the nonproportional stressing induces almost elastic shear deformation in the matrix outside the first nearest-neighbor fibers of loaded fiber breaks. Then, the 3D shear-lag analytical solution derived by the present authors is modified to be applicable to low fiber volume fractions and is employed to discuss how the nonproportional stressing in the matrix influences the stress concentrations near loaded fiber breaks. The 3D analytical solution is shown to be applicable to loaded, as well as initial, fiber breaks, if the matrix shear modulus in the solution is prescribed by taking account of the nonproportional stressing. It is thus concluded that the nonproportional stressing in the matrix may considerably lower the stress concentrations near loaded fiber breaks.
一般社団法人日本機械学会の論文
2005-09-18