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  4. Efficient Characterization and Modelling of the Nonlinear Behaviour of LFT for Crash Simulations
 
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2021
Conference Paper
Titel

Efficient Characterization and Modelling of the Nonlinear Behaviour of LFT for Crash Simulations

Abstract
Modeling the nonlinear material behaviour of long fiber reinforced thermoplastics(LFT) presents a challenging task since local inhomogeneities and nonlinear effects must betaken into account also on the microscale. We present a computational method with which we can predict the nonlinear material response of a composite material using only standard DMA measurements on the pure polymer matrix material. The material models considered include plasticity, damage, viscoelasticity, and visco-plasticity as described in [1]. These models can be combined similar to the model from [2] and extended to the composite by assigning linear elastic properties to the fibers. The mechanical response of the composite is computed using an FFT-based technique [3].The geometry of the composite, in particular t he fiber orientation, can be characterized using injection molding simulations or micro CT scans. We create virtual models of the composite using the algorithm of [4]. We show that with this method, the material behaviour of the composite can be predicted while the experimental complexity needed for the material characterization is low.
Author(s)
Grimm-Strele, Hannes
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM
Kabel, Matthias
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM
Andrä, Heiko
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM
Staub, Sarah
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM
Lienhard, Jörg
Fraunhofer-Institut für Werkstoffmechanik IWM
Schweiger, Timo
Fraunhofer-Institut für Werkstoffmechanik IWM
Herd, Olaf
Celanese Services Germany GmbH
Hauptwerk
14th WCCM & ECCOMAS Congress 2020
Funder
Bundesministerium für Wirtschaft und Energie BMWi (Deutschland)
Konferenz
World Congress in Computational Mechanics (WCCM) 2021
European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS) 2021
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DOI
10.23967/wccm-eccomas.2020.130
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Externer Link
Language
English
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Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM
Fraunhofer-Institut für Werkstoffmechanik IWM
Tags
  • computational mechani...

  • composites

  • LFT

  • microscale

  • viscoplasticity

  • viscoelasticity damag...

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