Martin Reiter, Michael Jerabek, Zoltan Major,
"Micromechanically based Modelling of the Failure Behavior of Short Fiber Reinforced Polypropylene Components under Impact Loading"
: Proceedings - 20th International Conference on Composite Materials, 7-2015
Micromechanically based Modelling of the Failure Behavior of Short Fiber Reinforced Polypropylene Components under Impact Loading
Sprache des Titels:
Proceedings - 20th International Conference on Composite Materials
Components made from short fiber reinforced thermoplastic materials reveal a strong local anisotropic behavior, which is determined by the local fiber orientation distributions (FOD). This FOD is defined during the processing of the material - usually injection molding. Thus, a proper simulation of the mechanical behavior of such components needs to consider the local microstructure. In this study, the failure behavior under impact loading was investigated for an injection molded component made of a short glass fiber reinforced polypropylene material. In a first step the local FODs were calculated using an injection molding simulation and validated by µ-computed tomography (µ-CT) experiments. The mechanical behavior was predicted based on the microstructure using a mean-field homogenization (MFH) approach. Therefore, the fibers were modeled by a linear elastic and the matrix by an elastic-viscoplastic material model. The MFH model was validated for loading rates up to 10m/s on special injection molded specimens, which reveal a high degree of fiber orientation. For failure modeling, the first pseudo grain failure (FPGF) model and the generalized incremental stress-state dependent damage model (GISSMO) were implemented in an explicit finite element model of the component. Impact tests were performed on a servo-hydraulic testing machines at loading rates up to 10m/s. Coupled finite element and microstructural simulations, which use the predicted local fiber orientations in order to calculate the local material behavior, were performed using both failure models. The force-displacement curves as well as the crack patterns were compared to the experimental results.