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On the anisotropic plastic behaviour of short fibre reinforced thermoplastics and its description by phenomenological material modelling

: Dillenberger, Felix


Wiesbaden: Springer Fachmedien, 2020, XIX, 227 S.
Mechanik, Werkstoffe und Konstruktion im Bauwesen, 53
ISBN: 978-3-658-28198-4
ISBN: 978-3-658-28199-1
Fraunhofer LBF ()
SFRTP; material modeling; Polymer Matrix Material; Anisotropic Plastic; short fibre reinforced plastic

This work introduces a material modelling approach for explicit finite element simulations of injection moulded short fibre reinforced thermoplastics. The material model considers linear-elastic behaviour and non-linear orthotropic stress-state dependent viscoplastic deformation for arbitrary fibre distributions. Regarding elasticity and the initial yield surface, a micro-mechanical Mori-Tanaka based approach is applied. On the matrix level an isotropic quadratic yield surface is introduced which is transferred into a Tsai-Wu yield surface on the composite level. An analytical expression for non-linear hardening and a simplified consideration of strain rate dependency is presented. The constitutive equations were verified with the experiments of a self-compounded PPGF30 material regarding regarding tension, compression and shear at different orientation distributions.