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Modelling of Pyrotechnic Pretensioners
Published December 04, 2006 by Fraunhofer Institut Chemische Technologie in Germany
Event: Airbag 2006
Pyrotechnic pretensioners are widely used components in today's state-of-the-art occupant restraint systems. Their objective is to pull in belt in a crash situation and thus tighten the occupant to the seat in an early crash phase. One characteristic physical behavior of pyrotechnic pretensioners is the load-case-dependent performance. That is, the belt pull in is in general a function of belt load.
Classical modelling of pretensioners applies a force versus displacement characteristic. This approach is valid within given boundary conditions. In order to account for transferability to other load cases, extended modelling techniques are investigated. Based on the existing thermodynamic approaches of airbag modelling, the paper presents an investigation to model pyrotechnic pretensioners, both in detailed component simulations as well as in occupant restraint simulations. Application examples in analysis of structural integrity as well as in occupant restraint simulations are shown.