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Spring-in behavior of curved composites manufactured by Flexible Injection

Authors:	Philippe Causse Edu Ruiz François Trochu

Affiliation:	1. Department of Mechanical Engineering, Research Center for High Performance Polymer and Composite Systems (CREPEC), Polytechnique Montréal, P.O. Box 6079, Station “Centre-ville”, Montréal, Québec H3C 3A7, Canada;2. School of Civil Engineering, Wuhan University, 8 South Road of East Lake, Wuchang, 430072 Wuhan, PR China;3. Luxembourg Institute of Science and Technology (LIST), 5, avenue des Hauts-Fourneaux, Esch-sur-Alzette L-4362, Luxembourg;1. Université de Toulouse, INSA, UPS, Mines d’Albi, ISAE, ICA (Institut Clément Ader), 135 Avenue de Rangueil, 31077 Toulouse Cedex, France;2. CTRM, Composites Technology City, Batu Berendam, 75350 Melaka, Malaysia;3. Aerospace Malaysia Innovation Center, Level 1, MIGHT Building, 3517, Jalan Teknokrat 5, 63000 Cyberjaya, Selangor, Malaysia;4. Airbus Group Singapore, 110 Seletar Aerospace View, Singapore 787562, Singapore;5. Faculty of Engineering, Burapha University, 169 Long-Hard Bangsaen Road, Chonburi 20131, Thailand;1. School of Civil Engineering, Wuhan University, 8 South Road of East Lake, Wuchang, 430072 Wuhan, PR China;2. Department of Mechanical Engineering, Research Center for High Performance Polymer and Composite Systems, Polytechnique Montréal, 2900 Boulevard Edouard Montpetit, Montréal, Québec H3T 1J4, Canada;3. Department of Mechanical Engineering, École de Technologie Supérieure (ETS), 1100, rue Notre-Dame Ouest, Montréal, Québec H3C 1K3, Canada;1. Composite Structures and Processes, Cenaero, Rue des Frères Wright 29, 6041 Gosselies, Belgium;2. Institute of Mechanics, Materials and Civil Engineering, Université catholique de Louvain, Place Sainte Barbe 2, 1348 Louvain-la-Neuve, Belgium;3. Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Croix du Sud 1, 1348 Louvain-la-Neuve, Belgium;1. DLR, Institute of Composite Structures and Adaptive Systems, Lilienthalplatz 7, 38108 Braunschweig, Germany;2. Technical University of Braunschweig, Institute of Adaptronics and Functional Integration, Langer Kamp 6, 38106 Braunschweig, Germany

Abstract:	This paper investigates the manufacturing distortion of curved composite parts manufactured by a new Liquid Composite Molding (LCM) process called Flexible Injection (FI). This technique uses a deformable tool to speed up the fabrication but may generate manufacturing defects when strongly curved shapes are processed. The goal of the study is to evaluate the impact of such heterogeneities on the dimensional stability of the product. Curved components were first manufactured with varying processing conditions to achieve a wide range of layup quality. The shape stability of the samples was then recorded as a function of temperature to measure the thermoelastic component of distortion and experimental results were compared with predictions made by two modeling techniques. Under certain conditions, manufacturing defects can significantly affect the distortion behavior. This suggests that a robust preforming procedure is of primary importance to produce curved parts by Flexible Injection with a high level of repeatability.

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