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To provide a maximum protection for vehicle passengers during accidents a compliance to the principles of "Crashworthiness" is required. Applied to passenger cars this translates into a persistently stiff cab and a high energy absorption with a soft characteristic yielding moderate loads only.
Crash simulation is an essential tool for the development of new products especially in automotive industries, because using these tools makes it possible to investigate variations regarding design and the material selection. Thus, crash simulation helps to reconcile the opposite goals of crashworthiness on one hand and weight reduction on the other hand.
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Expertise
Our focus:
- Evaluation of crash safety based on different failure concepts (damage models, forming limit diagram)
- Experimental characterization and modelling of the strain rate sensitivity of different materials (metals, plastics, vinyl foam, aluminum foam, composite glasses for windshields)
- Characterization and modelling of laser and spot welding connections
Two concepts are presently tested to improve the modelling of deformation and damage in crash simulations.
There is for one the forming limit diagram, FLD , which in a phenomenological manner describes the limit strain of a material for different stress states. However, the determination of a FLD requires a large number of experiments.
On the other hand, the mechanisms of ductile failure are well described by the Gurson model and its derivatives. The applicability of the Gurson model is shown here for the example of a interior door part of a Volkswagen Polo made of Magnesium. |
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SimBAU
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