DEVELOPMENT AND VALIDATION OF A US SIDE IMPACT MOVEABLE DEFORMABLE BARRIER FE MODEL
Automotive safety regulations vary in different parts of the world. Dynamic side impact regulations, for example, are different than the ones in Europe. United States National Highway Traffic Safety Administration (NHTSA) and the European Union (EU) have each produced their own distinct testing procedures such as different deformable barriers, impact configurations and anthropomorphic test devices (dummies). Although both test procedures have the same final objective, estimate occupant responses in side impact, they differ greatly in execution. One of the main differences in testing is the Moving Deformable Barrier (MDB) used. The US MDB is designed to represent an average midsize vehicle in the US market, while the European MDB represents a mid size vehicle in Europe. The objective of this paper is to develop a finite element model representing the US deformable barrier for use in side impact simulations. Special emphasis is made on using the various available material models in LS-DYNA and the correct adhesive properties to predict the correct behavior of the honeycomb material. These models are validated to available full-scale tests. As known by many researchers, the main difficulty of MDB modeling is the prediction of the barrier complex failure modes. In side impact tests, the severe shear deformation of the honeycomb material, full densification of barrier edge, rupture of aluminum cover sheets, and tearing of honeycomb blocks are often observed. This complex pattern of honeycomb material failure mode makes it difficult to predict. Numerical instabilities, such as negative volume, sever hourglassing, and inaccurate predictions are often experienced.
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DEVELOPMENT AND VALIDATION OF A US SIDE IMPACT MOVEABLE DEFORMABLE BARRIER FE MODEL
Automotive safety regulations vary in different parts of the world. Dynamic side impact regulations, for example, are different than the ones in Europe. United States National Highway Traffic Safety Administration (NHTSA) and the European Union (EU) have each produced their own distinct testing procedures such as different deformable barriers, impact configurations and anthropomorphic test devices (dummies). Although both test procedures have the same final objective, estimate occupant responses in side impact, they differ greatly in execution. One of the main differences in testing is the Moving Deformable Barrier (MDB) used. The US MDB is designed to represent an average midsize vehicle in the US market, while the European MDB represents a mid size vehicle in Europe. The objective of this paper is to develop a finite element model representing the US deformable barrier for use in side impact simulations. Special emphasis is made on using the various available material models in LS-DYNA and the correct adhesive properties to predict the correct behavior of the honeycomb material. These models are validated to available full-scale tests. As known by many researchers, the main difficulty of MDB modeling is the prediction of the barrier complex failure modes. In side impact tests, the severe shear deformation of the honeycomb material, full densification of barrier edge, rupture of aluminum cover sheets, and tearing of honeycomb blocks are often observed. This complex pattern of honeycomb material failure mode makes it difficult to predict. Numerical instabilities, such as negative volume, sever hourglassing, and inaccurate predictions are often experienced.
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