Tomohiro Yokozeki, Ph.D, studied aerospace engineering at The University of Tokyo on damage characterization and prediction in composite laminates. He worked for Japan Aerospace Exploration Agency as a researcher from 2004 to 2006 and has been working in the department of aeronautics and astronautics in The University of Tokyo as a lecturer from 2007 to 2008, and an associate professor since 2009. His research interest includes multifunctional materials and structures, non-conventional composite structures and related manufacturing, and damage simulation on composites.
Numerical analysis on the mechanical properties of carbon fiber-reinforced thermoplastic composites with in-plane fiber bundle waviness.
Carbon fiber reinforced thermoplastic composites (CFRTP) are expected to be applied to structural components owing to high productivity and recyclability. Initial imperfections (fiber bundle waviness, fiber misalignment, voids, variation of fiber volume fraction, etc) are inevitably induced in composites during the manufacturing process, and these imperfections cause the deterioration of mechanical performance of composites. In-plane fiber bundle waviness is often observed in thin unidirectional CFRTP, which is of concern in the present talk. This study experimentally investigates the quantitative measurement of fiber bundle waviness (e.g. amplitude and wave length of fiber bundle waviness), and evaluates the flexural mechanical properties of unidirectional CFRTP. Relationship between the mechanical properties and the magnitude of fiber bundle waviness is discussed with the numerical study on the strength degradation owing to fiber bundle waviness.