Measurement of Negative Poisson's Ratio of CFRP Laminates Using 3D Digital Scanning Method

Abstract

In this study, a through-the-thickness negative Poisson's ratio of an angle-ply carbon fiber-reinforced plastic (CFRP) laminate is experimentally investigated using a 3D digital scanning method. For this, an image-based measurement method using a 3D digital scanner is developed to obtain the thickness change of CFRP laminates. The thickness change is used to calculate the through-the-thickness Poisson's ratio of CFRP laminates. Then, a tensile test of a [±θ°] angle-ply CFRP laminate is performed, and the through-the-thickness Poisson's ratio is measured based on the developed method. The results obtained suggest that the through-the-thickness Poisson's ratio exhibits negative values which become increasingly negative as (visco)plastic deformation progresses in the laminate, as demonstrated in our previous analysis.