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For cold gas Inflator, high refinement of ultimate pressure load forecast of inflator housing is one key of Inflator development. For inflator housing hydro-burst test ultimate load calculation, nonlinear finite element software for high precision results. At beginning, the material parameters of inflator housing for simulation is correlated. The FEA material model adopts the stress-strain data from uniaxial tensile experiments. Considering the geometrical nonlinearity resulting from large deformation as well as material nonlinearity from plastic hardening, the whole tensile process from tensile deformation to failure of the specimen is simulated. Numerical results show that the simulation is appropriate to predict the entire deformation process, and simulation results of ultimate tensile load, X-shape distribution of concentrated instability zone, the fracture location and inclined angle all agrees with that of test results.

NHTSA released the FMVSS226 Standard in 2011, and defined the requirements for ejection mitigation systems, which limit the linear travel of headform by 100mm. In China regulations, there are similar requirements starting in 2021. Therefore, on the basis of the existing airbag design, adding the rollover protection function becomes a challenge for the airbag development. During the development of the curtain airbag, the cushion design, inflator type, and the fold pattern, all have an important influence on the airbag unfolding direction, the airbag positioning time and the airbag internal pressure, and then significantly affect the occupant protection performance afterwards. In order to reduce the cost and shorten the development time, it is necessary to predict the process of cushion deployment kinematics and the internal pressure of the airbag with high refinement, and based on it to predict and evaluate the FMVSS226 ejection mitigation performance.