@inproceedings{0b90d401635e4b2e961e125d6c168ab1,
title = "Application oriented failure modeling and characterization for polymers in automotive pedestrian protection",
abstract = "In the development process of automotive pedestrian protection (PedPro) for upper- And lower leg impact, the failure of polymer components plays an important role. To influence impact kinematics, fractures can either be advantageous or undesirable. Simulation based design is a challenge for material modeling and hence characterization, particularly for failure of polymer components. [1] [2] An application-oriented concept for failure modeling in FEM simulations of polymer components in pedestrian protection is presented. The boundary conditions for polymer failure in PedPro are investigated. Failure models are evaluated and selected by referring to special component tests, scanning-electron microscopy (SEM) of failure areas and simulative analysis of continuum mechanical parameters [3]. The approach of capturing the material's behavior and consecutive modeling including parametrization is presented as well. Here a polymer blend (PC-PET) is exemplarily characterized in the highly dynamic domain. This is mainly done by using innovative pendulum tests. The parametrization of a modified Bai- Wierzbicki failure approach is performed by a numerical optimization process. The model validation is done with more complex test samples by pendulum testing. [4] [5] [6] 1 INTRODUCTION Through front vehicle design, automotive pedestrian protection reduces injuries and their aftereffects in case of vehicle-pedestrian accidents. The design is mainly based on finite element (FE) simulations. Especially for lower and upper leg impacts, fractures in polymer parts can either be desired or undesired to influence crash kinematics. However, state of the art simulation technology does not allow a reliable prediction of polymeric failure. Following, an application-oriented approach for simulative fracture in PedPro is presented. After the boundary conditions in PedPro are examined by a practice oriented component test rig, appropriate fracture modeling for polymers in PedPro is developed. During an innovative test procedure, characterization and parametrization is exemplarily performed for the polymer blend polycarbonate-polyethyleneterephtalate (PC-PET).",
keywords = "Fracture, Impact testing, PC-PET, Parametrization, Pedestrian protection",
author = "Holger Staack and Dominic Seibert and Horst Baier",
year = "2015",
language = "English",
series = "Proceedings of the 8th International Conference on Computational Plasticity - Fundamentals and Applications, COMPLAS 2015",
publisher = "International Center for Numerical Methods in Engineering",
pages = "284--295",
editor = "Djordje Peric and Michele Chiumenti and Eugenio Onate and D.R.J. Owen",
booktitle = "Proceedings of the 13th International Conference on Computational Plasticity - Fundamentals and Applications, COMPLAS 2015",
note = "13th International Conference on Computational Plasticity, COMPLAS 2015 ; Conference date: 01-09-2015 Through 03-09-2015",
}