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Efficiency-driven model simplifications in crash simulations of FRP-metal hybrid material systems in automotive body structures

: Dlugosch, Michael; Fritsch, Jens; Hiermaier, Stefan; Lukaszewicz, Dirk

International Association for the Engineering Analysis Community -NAFEMS-:
A world of engineering simulation. NWC 2019, NAFEMS World Congress : 17-20 June, Quebec City, Canada : incorporating SPDM, International Conference Simulation Process & Data Management : summary of proceedings
Hamilton, UK: NAFEMS, 2019
ISBN: 9781910643525
21 S.
National Agency for Finite Element Methods and Standards (NAFEMS World Congress) <2019, Quebec>
International Conference on Simulation Process and Data Management (SPDM) <4, 2019, Quebec>
Fraunhofer EMI ()

Growingly stringent CO2-emission regulations lead to increased efforts to explore novel multi-material systems for effective lightweight design solutions. These often exhibit a complex internal architecture including interfaces between the discrete material phases. Particularly in highly nonlinear crash simulations of complex structures, model fidelity is a key aspect in the trade-off considerations between accurate predictive capabilities of a modeling technique and the resources needed for model development as well as computationally producing and processing solutions. The present study investigates various model simplification strategies for Finite Element (FE)-simulations of automotive crash structural concepts composed of fiber-reinforced plastics (FRP)-metal hybrid material systems in view of the conflicts invoked by strict model efficiency requirements. This particularly implies the modeling resolution of the FRP phase and different modeling techniques for the adhesive interface between the material phases and the respective implications on the predictive qualities of the simulation results. All results are compared to hardware experiments of hybrid generic structural components under crash loading conducted by the authors. The results show, that the model fidelity in the FRP phase does generally have a strong correlation with the predictive capabilities of the overall simulation. Comparing the simulation and the experimental data of generic components shows that explicitly modeling the cohesive behavior at the adhesive interface is not only more complex, it is also not necessarily bound to produce more accurate results than a simple modeling approach using rigid tie connections. In terms of computational efficiency however, the tie modeling approach does not decrease the computational time solving the model, which limits potential efficiency benefits to the reduced modeling complexity and the omission of the adhesive’s characterization process.