Abstract
A straightforward approach to predict spring-in deformations of angled composite parts is presented. Therefore, a proposal by Radford is extended in order to calculate the spring-in contribution due to chemical shrinkage. For this, the volumetric shrinkage of neat thermoset resin, which is in the range of 2–7%, is transferred to equivalent strains on ply level assuming no shrinkage in fiber direction. As the fiber volume fraction (FVF) affects mechanical and chemical properties significantly, the spring-in angle is affected as well. Therefore, the numerical investigation accounts for the spring-in angle and its thermal and chemical contributions depending on the FVF. Classical laminate theory (CLT) is utilized to homogenize layup expansion and shrinkage properties. For validation purposes, model predictions are compared with measurement results gained from one manufactured test specimen. Good agreement between analytical and experimental results is found. Furthermore, the chemical contribution of the total spring-in angle ∆φ turned out to be significantly larger than the thermal contribution.
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References
Anghelescu, M.S., Alam, M.K.: Carbon foam tooling for aerospace composites. SAMPE Conference Cincinnati, Ohio (2007)
Ersoy, N., Tugutlu, M.: Cure kinetics modeling and cure shrinkage behavior of a thermosetting composite. Polym. Eng. Sci. 50(1), 84–92 (2010)
Kappel, E., Stefaniak, D., Hühne, C.: A semi-analytical simulation strategy and its application to warpage of autoclave-processed CFRP parts. Compos. Part A, 42(12), 1985–1994 (2011)
Kleineberg, M.: Präzisionsfertigung komplexer CFK-Profile am Beispiel Rumpfspant, TU Carolo-Wilhelmina zu Braunschweig (2008)
Pellegrino, S.: Ultra-thin Carbon Fiber Composites: Constitutive Modeling and Applications to Deployable Structures. Lectures 1–2, California Institute of Technology (2009)
Radford, D.W.: Shape Stability in Composites. Rensselaer Polytechnic Institute, Troy (1987)
Schürmann, H.: Konstruieren mit Faser-Kunststoff-Verbunden. Springer, ISBN 3-540-40283-7 (2005)
Spröwitz, T., Hühne, C., Kappel, E.: Thermal aspects for composite structures—from manufacturing to in-service predictions. In: CEAS 2009, 26–29 Oct. 2009, Manchester, UK, (2009)
Svanberg, J.M., Altkvist, C., Nyman, T.: Prediction of shape distortions for a curved composite C-spar. J. Reinf. Plast. Compos. 24, 323 (2005)
Twigg, G., Poursatip, A., Fernlund, G.: Tool–part interaction in composites processing. Part I: experimental investigation and analytical model. Compos. Part A Appl. Sci. Manuf. 35, 121–133 (2004)
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Kappel, E., Stefaniak, D., Hühne, C. (2013). About the Spring-In Phenomenon: Quantifying the Effects of Thermal Expansion and Chemical Shrinkage. In: Wiedemann, M., Sinapius, M. (eds) Adaptive, tolerant and efficient composite structures. Research Topics in Aerospace. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29190-6_21
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DOI: https://doi.org/10.1007/978-3-642-29190-6_21
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