Forming Mechanisms During Bending of Continuous Fiber-Reinforced Thermoplastic Tubes
A rotary draw bending process has been modified to meet the requirements of forming continuous fiber-reinforced thermoplastic tubes, produced using a tape winding machine. Bending tests have been performed on PA6/CF-tubes with different fiber angles and winding pattern. The resulting fiber angle and fiber distribution in the forming zone is analyzed by microscopic analysis and tactile and optical measurement on the surface of the tubes. The optical measurement is done using a test rig and a MATLAB-Tool, developed at the Chair for Forming Technologies, the tactile measurement is done using a FARO measuring arm. The dependency of the resulting fiber angle on the initial winding lay-up is developed. The forming behavior is classified by defining forming mechanisms like fiber angle realignment, tape slip and matrix flow. An outlook on future investigations and possible applications of the tubes is given.
Authors: Jan Böcking, and Bernd Engel
Conference: SAMPE Seattle 2017