Fabrication of doubly-curved CFRP shell structures with control over fiber directions

Masahito Takezawa, Yuto Otoguro, Kohei Matsuo, Tadahiro Shibutani, Akio Sakurai, Takashi Maekawa

Research output: Contribution to journalArticlepeer-review

Abstract

We introduce a fabrication method of doubly-curved shell structures by CFRP with control over fiber directions. Doubly-curved surfaces are tessellated into structured quadrilateral patches according to the purpose of use. One can design the tessellation in the parameter space, and map it to the 3D parametric surface, or use the orthogonal net of curves on surfaces such as lines of curvature, principal stretch lines, and principal stress lines. These patches, which we call generalized principal patches, are flattened onto a plane, and connected one by one by aligning the equi-length adjacent edges using translations and rotations forming generalized principal strips. Carbon fiber tows are placed onto these strips with one stroke by tailored fiber placement embroidery machines so that the fibers are not disconnected within strips. Preforms are stacked layer by layer into a mold of particular parts, and VaRTM or L-RTM method is employed to fabricate CFRP parts. We demonstrated the effectiveness of our proposed method by manufacturing an automobile hood and a marine propeller blade.

Original languageEnglish
Article number103028
JournalCAD Computer Aided Design
Volume136
DOIs
Publication statusPublished - 2021 Jul

Keywords

  • CFRP
  • Isogeometric Analysis
  • Lines of curvature
  • NURBS
  • Principal stress/stretch lines
  • Tailored fiber placement

ASJC Scopus subject areas

  • Computer Science Applications
  • Computer Graphics and Computer-Aided Design
  • Industrial and Manufacturing Engineering

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