Coupling of Mold Flow Simulations with Two-Scale Structural Mechanical Simulations for Long Fiber Reinforced Thermoplastics

Abstract:

The entire simulation process for long fiber reinforced thermoplastics is examined to determine the effective mechanical properties which are influenced by the microstructural fiber orientation state. Therefore, flow and fiber orientation simulations are conducted and the obtained fiber orientation tensors are used in two-scale structural simulations. The fiber orientation distributions as well as the mechanical properties are compared with micro-computed tomography data and results from threepoint bending tests performed by dynamical mechanical analysis (DMA), respectively. The validated results show that prediction of the essential mechanical properties is possible with the applied combinated methods and that the knowledge of the fiber orientation and its gradients is of crucial importance for the entire simulation process.

• Periodical: Materials Science Forum (Volumes 825-826)
• Pages: 655-662
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.825-826.655
• Online since: July 2015
• Authors: Fabian Buck, Barthel Brylka, Viktor Müller, Timo Müller, Andrew N. Hrymak, Frank Henning, Thomas Böhlke*
• Keywords: Dynamic Mechanical Analysis (DMA), Fiber Orientation, Long Fiber Reinforced Composites, Multiscale Modeling

References

[1] M. Schemme, LFT-development status and perspectives, Reinforced Plastics 52 (2008) 32-39.

DOI: 10.1016/s0034-3617(08)70036-5

[2] S. G. Advani, C. L. Tucker III, The use of tensors to describe and predict fiber orientation in short fiber composites, Journal of Rheology 31 (1987) 751-784.

DOI: 10.1122/1.549945

[3] F. Folgar, C. L. Tucker III, Orientation behavior of fibers in concentrated suspensions, Journal of Reinforced Plastics and Composites 3 (1984) 98-119.

DOI: 10.1177/073168448400300201

[4] G. B. Jeffery, The motion of ellipsoidal particles immersed in a viscous fluid, Proceedings of the Royal Society of London Series A 102 (1922) 161-179.

DOI: 10.1098/rspa.1922.0078

[5] J. Wang, J. F. O'Gara, C. L. Tucker III, An objective model for slow orientation kinetics in concentrated fiber suspensions: Theory and rheological evidence, Journal of Rheology 52 (2008) 1179-1200.

DOI: 10.1122/1.2946437

[6] J. H. Phelps, C. L. Tucker III, An anisotropic rotary diffusion model for fiber orientation in shortand long-fiber thermoplastics, Journal of Non-Newtonian Fluid Mechanics 156 (2009) 165-176.

DOI: 10.1016/j.jnnfm.2008.08.002

[7] Autodesk Simulation Moldflow Insight 2014: User's Guide.

[8] S. Tröster, Materialentwicklung und -charakterisierung für thermoplastische Faserverbundwerkstoffe im Direktverfahren, Fraunhofer-IRB-Verlag, (2004).

[9] C. L. Tucker III, E. Liang, Stiffness predictions for unidirectional short-fiber composites: Review and evaluation, Composites Science and Technology 59 (1999) 655-671.

DOI: 10.1016/s0266-3538(98)00120-1

[10] J. Willis, Bounds and self-consistent estimates for the overall properties of anisotropic composites, Journal of the Mechanics and Physics of Solids 25 (1977) 185-202.

DOI: 10.1016/0022-5096(77)90022-9

[11] J. D. Eshelby, The determination of the elastic field of an ellipsoidal inclusion, and related problems, Proceedings of the Royal Society of London Series A 241 (1957) 376-396.

DOI: 10.1098/rspa.1957.0133

[12] T. Mura, Micromechanics of defects in solids, Vol. 3, Springer, (1987).

[13] D. H. Chung, T. H. Kwon, Invariant-based optimal fitting closure approximation for the numerical prediction of flow-induced fiber orientation, Journal of Rheology 46 (2002) 169-194.

DOI: 10.1122/1.1423312