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A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
A New Approach for IIHS shell elements barrier model development
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A New Approach for IIHS shell elements barrier model development

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  • 1. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. A New Approach for IIHS shell elements barrier model development Salim Abdennadher (Altair) Petros Goutas (CELLBOND), Franck Njilie (Altair)
  • 2. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. IIHS side MDB : Radioss shell model IIHS Side MDB aims to evaluate vehicle occupant protection  Barrier shape and crushing strength represents SUV’s and pickups vehicle front ends.
  • 3. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Honeycomb scaled cell size modeling method Honeyomb structure S t S t Mean crushing strength in principal cell axe direction (T. Wierzbicki 1983) 5 t 3  m  16.56   0    S=> Target time step and barrier number of elements adjusted by thickness to cell size ratio
  • 4. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Honeycomb scaled cell size modeling method  Realistic barrier deformation shape  Better prediction of loading events in full vehicle crash test simulation.  Better prediction of biomechanical criterion S t  CPU time acceptable regarding the accuracy improvement => Applied successfully for ODB and FMVSS214/301 MDB
  • 5. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Safety tools : development scheme M
  • 6. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. IIHS side MDB : Radioss model statistics Parameters IIHS Side FE Model Version 100 Radioss Version 10 Natural time step (µs) 1.0 Nodes 474,926 1D elements (beam / 2/28 spring) Shell 4-nodes 492,959 Shell 3-nodes 1,619 Solids (Tetra4 / Bricks) 0/17,731
  • 7. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. IIHS side MDB : Validation test matrix IIHS with or without Mass of trolley and Impact velocity Number of Test configuration bumper impactor (kg) (m/s) tests w IIHS against flat LCW 1503 13.9 m/s 2 IIHS against flat LCW w/o 1503 11.5 m/s 2 Pole against IIHS w 1498 8.3 m/s 2 Sill against IIHS w/o 1499 7.9 m/s 1 Sill against IIHS w 1499 7.9 m/s 1
  • 8. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. IIHS side MDB : Beta version validation status  Entrapped air has some effect at certain level of crush.
  • 9. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. IIHS side MDB: Cellbond sample test Test set up Sample shape after full crash Impactor (falling mass) Honeycomb sample Rigid support & loadcell
  • 10. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. IIHS side MDB: Cellbond sample test correlation
  • 11. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. IIHS side MDB: Flat wall test Modeling air effect Entrapped air has significant effect at certain level of crush. The air effect will be introduced by using Radioss monitored volume with adequate pressure function.
  • 12. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. IIHS side MDB : release version validation status
  • 13. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. IIHS side MDB : release version full vehicle crash test
  • 14. Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved. Conclusion & perspective  Conclusion  In some test configuration (mainly rigid flat wall cases), air entrapped inside honeycomb cells generates additional resistance to honeycomb structure.  The air effect modeling option has been validated through sample tests provided by CELLBOND.  In order to enhance the IIHS MDB Radioss FE model reliability, air effect has been successfully modeled.  The actual model accuracy has been proven for the hole validation test matrix (pole impact, Sill test …)  Perspective  Carry back the air effect modeling option to ODB and FMVSS214/301  Partnership with CELLBOND : European side MDB coming soon.

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