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Investigation of process induced warpage for pultrusion of a rectangular hollow profile

Identifieur interne : 000066 ( Main/Exploration ); précédent : 000065; suivant : 000067

Investigation of process induced warpage for pultrusion of a rectangular hollow profile

Auteurs : Ismet Baran [Pays-Bas] ; Jesper H. Hattel [Danemark] ; Remko Akkerman [Pays-Bas]

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Mots-clés :

Abstract

A novel thermo-chemical-mechanical analysis of the pultrusion process is presented. A process simulation is performed for an industrially pultruded rectangular hollow profile containing both unidirectional (UD) roving and continuous filament mat (CFM) layers. The reinforcements are impregnated with a commercial polyester resin mixture (Atlac 382). The reactivity of the resin is obtained from gel tests performed by the pultruder. The cure kinetics parameters are estimated from a fitting procedure against the measured temperature. The cure hardening instantaneous linear elastic (CHILE) model is adopted for the evolution of the resin elastic modulus using the temperature-dependent elastic response provided by the resin supplier. The numerical model predictions for the warpage trend at the end of the process are found to agree well with the warpage observed in the real pultruded products. In addition, the calculated warpage magnitude is found to be in the measured range of warpage magnitude for the manufactured part.


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<term>Hollow shape</term>
<term>Kinetic model</term>
<term>Manufacturing defect</term>
<term>Mechanical properties</term>
<term>Modeling</term>
<term>Numerical simulation</term>
<term>Pultrusion</term>
<term>Rectangular shape</term>
<term>Temperature effect</term>
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<term>Unsaturated polymer</term>
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<term>Gauchissement</term>
<term>Moulage pultrusion</term>
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<term>Ester polymère</term>
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<term>Modélisation</term>
<term>Polymère insaturé</term>
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<div type="abstract" xml:lang="en">A novel thermo-chemical-mechanical analysis of the pultrusion process is presented. A process simulation is performed for an industrially pultruded rectangular hollow profile containing both unidirectional (UD) roving and continuous filament mat (CFM) layers. The reinforcements are impregnated with a commercial polyester resin mixture (Atlac 382). The reactivity of the resin is obtained from gel tests performed by the pultruder. The cure kinetics parameters are estimated from a fitting procedure against the measured temperature. The cure hardening instantaneous linear elastic (CHILE) model is adopted for the evolution of the resin elastic modulus using the temperature-dependent elastic response provided by the resin supplier. The numerical model predictions for the warpage trend at the end of the process are found to agree well with the warpage observed in the real pultruded products. In addition, the calculated warpage magnitude is found to be in the measured range of warpage magnitude for the manufactured part.</div>
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