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  4. A sequential approach for simulation of thermoforming and squeeze flow of glass mat thermoplastics
 
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2021
Conference Paper
Title

A sequential approach for simulation of thermoforming and squeeze flow of glass mat thermoplastics

Abstract
In this study, a sequential thermoforming and squeeze flow simulation approach for Glass Mat Thermoplastic (GMT) material is proposed and applied to a hat section geometry using input properties based upon Tepex flowcore, a long glass fiber reinforced polyamide (PA/GF) mat manufactured by Lanxess. First, a fully-coupled thermomechanical simulation is conducted based on a purely Lagrangian description, to efficiently capture thermoforming. Subsequently, relevant state variables are mapped and initialized for a Coupled-Eulerian-Lagrangian (CEL) approach. The CEL approach is adopted to accurately capture squeeze flow, which is not possible by a purely Lagrangian description. While numerical techniques differ, both approaches use the same three-dimensional and thermomechanical constitutive equations including an equation of state, a nonlinear viscosity model, and crystallization kinetics, implemented through a material user-subroutine (VUMAT) for the commercially available simulation software package ABAQUS/Explicit.
Author(s)
Dörr, D.
Ivanov, S.
Gergely, R.
Meyer, N.
Henning, F.
Straatman, A.G.
Hrymak, A.
Mainwork
ESAFORM 2021, 24th International Conference on Material Forming  
Conference
International Conference on Material Forming (ESAFORM) 2021  
Open Access
DOI
10.25518/esaform21.376
Additional full text version
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