Abstract
A systematic examination of the effect of specimen size on the off-axis static tensile strength of a unidirectional carbon/epoxy laminate has been attempted for different fiber orientations. For this purpose, static tension tests are first performed on one-, two- and three-dimensional geometrically similar unnotched specimens of the unidirectional CFRP laminate, respectively. The comparison of the results on 2D-geometrically similar specimens indicates that the off-axis tensile strength tends to decrease as the width of specimen increases. In contrast, the off-axis tensile strength of 1D-geometrically similar specimen tends to increase as the thickness of specimen increases. The opposite features of the 1D and 2D scale effects reduce the scale effect on 3D-geometrically similar specimens in quantitative terms. The present study also suggests a difference between the scale dependences of the on-axis and off-axis strengths of the unidirectional CFRP laminate not only in quantitative terms but also in qualitative terms. Existing strength models are also tested for accuracy of prediction of the multidimensional scale effects on the off-axis tensile strength of the unidirectional CFRP laminate.
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