908 一方向CFRPの非主軸試験片の不均質変形場のDIC計測(OS9-(3)オーガナイズドセッション《複合材料の変形と破壊およびマルチスケール計算技術》)

概要

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Effects of end constraints on strain field of off-axis carbon/epoxy tensile specimens with a low aspect ratio are examined in detail by means of the digital image correlation method (DIC). The full fields of strain in off-axis specimens that are measured by DIC are compared between two kinds of end-tab shapes: the conventional rectangular-shaped tab and an oblique-shaped tab proposed by Sun and Chung. For specimens with the conventional rectangular tabs, a significant difference appeared between the longitudinal and lateral strains measured at the center and near the end-tab. A localized deformation band with a finite width is observed to develop along fibers. The oblique tabs effectively relax the end-constraint effect and almost removed the inhomogeneous state of deformation in initial linear elastic range. For the subsequent region of non-linear response, the oblique tabs markedly reduce the inhomogeneity in longitudinal and lateral strain fields.
2011-08-26