University of Twente Student Theses


3D Transient and crystallization model for laser assisted tape Winding

Hoeksema, V.L. (2017) 3D Transient and crystallization model for laser assisted tape Winding.

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Abstract:The Laser Assisted Tape Winding (LATW) additive manufacturing process winds uni-directional (UD) thermoplastic prepreg tape on a rotation mandrel, while a laser heats the tape and a roller pressurises the tape to consolidate layers to the mandrel. Tubular products can be fabricated by consolidating multiple layers on the mandrel using complex winding patterns. Currently, LATW does not achieve the same material quality of techniques that use post processes. This requires investigation of the in-situ consolidation that occurs during tape winding. Therefore a three-dimensional Lagrangian transient kinematic-optical-thermal(KOT) model was developed to investigate the process. The KOT model was used to determine the complete temperature history of the LATW process. The temperature history is analyzed to predict the crystallinity growth of the substrate in through-thickness and width direction. This prediction is made using a crystallinity model for Carbon/PEEK tape that analyses the heating and cooling rates of the thermal history. Experimental validation was carried using thermocouple and differential scanning calorimetry(DSC) measurements Lower crystallinity values at the bottom and top are explained due to high conduction rates and fewer temperature cycles respectively as well as the existence of an initial crystallinity value after melt.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:51 materials science, 52 mechanical engineering, 58 process technology
Programme:Mechanical Engineering MSc (60439)
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