Long glass fiber reinforced thermoplastics are widely used in industry because of their low cost and high performances. During the injection molding process, the glass fibers initial length is reduced by breakage and this phenomenon strongly affects some mechanical properties of the components, e.g. their impact strength. The aim of this study is to minimize the fibers breakage in a hot runner channel by optimizing its geometry. Geometrical control parameters were selected to model different geometries using a 3D modeler, and fluid dynamic numerical simulations were conducted using ANSYS Polyflow. An SQP optimization algorithm, implemented in a multi-objective optimization software, was used to determine the values of geometrical control parameters that minimize the fibers breakage.
Optimization of hot runner systems geometry for LGF reinforced thermoplastics
LUCCHETTA, GIOVANNI
2009
Abstract
Long glass fiber reinforced thermoplastics are widely used in industry because of their low cost and high performances. During the injection molding process, the glass fibers initial length is reduced by breakage and this phenomenon strongly affects some mechanical properties of the components, e.g. their impact strength. The aim of this study is to minimize the fibers breakage in a hot runner channel by optimizing its geometry. Geometrical control parameters were selected to model different geometries using a 3D modeler, and fluid dynamic numerical simulations were conducted using ANSYS Polyflow. An SQP optimization algorithm, implemented in a multi-objective optimization software, was used to determine the values of geometrical control parameters that minimize the fibers breakage.
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