EXAMINATION OF BENDING DEFORMATION BEHAVIORS OF CFRP WITH HELICOIDAL LAMINATE STRUCTURE BY DIC ANALYSIS

Abstract

This paper investigates on the four-point flexural deformation behaviors of helicoidally laminated CFRP by the use of Digital Image Correlation method. It is found that the helicoidal laminate shows very unique deformation behaviors. Namely, in the flexural span, the helicoidal laminate exhibits large shear strain values and equivalently inclined principal strain vectors on the tension and compression side. These behaviors clearly show that the helicoidal laminate does not follow beam theory.