Yarn crimp effects of Plain-weave fabric lamina and Iso-phase double laminate Analysed by Grating Shearography

摘要

Phase-shifting grating Shearography has been applied for the investigation of the tensile behaviour of carbon/epoxy plain-weave fabric composite with a small waviness. Experimental analyses were performed for the configurations of single lamina and iso-phase double laminate. The yarn crimp effects such as the tension/bending and tension/in-plane shear couplings were concentrated on the resin rich regions for the single lamina. As for the iso-phase double laminate, the yarn crimp effects were still significant because although the transverse shear strain due to the local bending effect of yarns is a little constrained by the other neighboring layer, the degree of the constraint was certainly insufficient to degenerate the local bending effect.