Investigation about Internal Observation of Nonlinear Flexural Behavior of Randomly Oriented Chopped Strand Thermoplastic CFRP by Using In-situ X-ray CT with 3 Point Bending Testing Machine

Abstract

In this study, the nonlinear flexural behavior of discontinuous and randomly oriented chopped strand thermoplastic CFRP was found to be related to the damage depth of the surface layer of the specimen, which were observed using an in-situ three-dimensional X-ray CT bending test system. The nonlinear behavior of the developed CFRP showed correlation between the occurrence of damage at the outer edge of the compression side and the process of development, and the stress of starting point of the nonlinear behavior was similar to the in-plane compressive strength obtained by the in-plane compression test. A simple theoretical model using the damage depth at the outer edge of the compression side of the developed CFRP under three-point bending load and in-plane compressive strength that was confirmed the nonlinear bending behavior of the developed CFRP agreed with the experimental value.