Full Frontal Crash Test
- 1. ME8020 CRASHWORTHINESS AND OCCUPANT PROTECTION 1 FALL 2016 Project-1 Frontal Impact GUIDANCE PROFESSOR : BIJAN KHATIB SHADHIDI SUBMITTED BY : KUNAL DAVE (GC3775) PRATIK SAXENA (GD8959)
- 2. FEDERAL MOTOR VEHICLE SAFTY STANDARD : 208 • FMVSS are U.S. federal regulations specifying design, construction, performance, and durability requirements for motor vehicles and regulated Automobile safety-related components, systems, and design features. • FMVSS are developed and enforced by the National Highway Traffic Safety Administration (NHTSA) • The objective of a crash test for Federal Motor Vehicle Safety Standard (FMVSS) No. 208 is to measure how well a passenger vehicle would protect its occupants in the event of a serious real world frontal crash.
- 3. INSURANCE INSTITUTE FOR HIGHWAY SAFETY (IIHS) • IIHS evaluates a vehicle's crashworthiness with the help of five tests: moderate overlap front, small overlap front, side, roof strength and head restraints & seats. • IIHS released the first results for a second, more demanding frontal offset test. The new test, which is used in addition to the 40% offset test introduced in 1995, subjects only 25% of the front end of the vehicle to a 40 mph impact. 3
- 4. PROBLEM STATEMENT • Analysis carried on Fixed barrier with 100% collision. • Analysis carried on Fixed barrier with 40% collision. • Analysis carried on Small offset rigid barrier with 25% collision. 4
- 5. Process Flow Chart Unit Conversion • All the files (Vehicle, airbag, side airbag, seat-belt) were converted from given unit system to Metric system(MKS). • Seat was designed according to metric system. • Dummy was already in MKS system. Dummy Positioning • Renumbering of dummy and positioning in ls dyna • Positioning dummy according to FMVSS 208 criteria. Steering and Airbag • Steering positioning in Van and front and side airbag installation. Contact Definition • Automatic single surface to surface for dummy parts and other components. • Node to surface and Contact surface for dummy and seat Belt. Vehicle Positioning • Definition of vehicle position according to FMVSS 208. • Positioning of Van with respect to wall as per regulation standards.
- 6. DUMMY, SEAT, SEATBELT, AIRBAG POSITIONING 6 • DUMMY ,SEAT, AIRBAG POSITIONING • Seat was created in Hypermesh using LS-Dyna profile according to dummy dimensions. • Steering column was created using shell elements. • DUMMY ,SEAT, AIRBAG WITH SEATBELT POSITIONING • The seat belt given to us was a passenger seat belt. • We used reflect option in LS- Prepost to convert the seat belt to driver’s seat belt orientation.
- 7. DUMMY POSITIONING: 7 In Inches FMVSS-208 RegulationFMVSS-208 Regulation 10.30 in 7.10 in Dummy Positioned Dummy Positioned
- 8. FMVSS 208 – Full Frontal Crash Modelling 8 • The Full Frontal Fixed Barrier Crash test (or Rigid Barrier test) represents a vehicle-to wall full frontal engagement crash with vehicle moving at the same impact velocity. • The test is intended to represent most real world crashes vehicle-to-fixed object) with significant frontal engagement in a perpendicular impact direction. • It is a full systems test which evaluates the protection provided by the energy- absorbing vehicle structure and the occupant restraint system.
- 9. DISPLACEMENT AND VON MISES STRESS 9
- 10. RESULT ANIMATION FOR 100% OFFSET 10
- 12. ENERGY PLOTS FOR FULL FRONTAL IMPACT 12 KINETIC ENERGY VS TIME INTERNAL ENERGY VS TIME TOTAL ENERGY VS TIME
- 13. DISPLACEMENT AND ACCELERATION PLOTS 13 DISPLACEMENT VS TIME RESULTANT ACCELERATION VS TIME
- 14. FRONTAL IMPACT WITH 40% OFFSET 14 • IIHS Tests : The Frontal Fixed Offset Deformable Barrier Test, often called the offset barrier test, subjects the vehicle/occupant restraint system to partial engagement of the front structure with a crushable barrier face. For all vehicles, this test exposes the belted or unbelted occupant to approximately the same change in velocity for any vehicle – regardless of vehicle mass/size. • Our analysis :The wall was moved 40% offset against a rigid , non-deformable wall.
- 15. DISPLACEMENT AND VON MISES STRESS 15
- 16. RESULT ANIMATION 40% Offset 16
- 17. ENERGY PLOTS FOR 40% OFFSET 17 KINETIC ENERGY VS TIME INTERNAL ENERGY VS TIME TOTAL ENERGY VS TIME
- 18. DISPLACEMENT AND ACCELERATION PLOTS 18 RESULTANT ACCELERATION VS TIME DISPLACEMENT VS TIME
- 19. IIHS - FRONTAL IMPACT WITH 25% SORB 19 0.8 m
- 20. DISPLACEMENT AND VON MISES STRESS 20
- 21. RESULT ANIMATION 25% Offset 21
- 22. ENERGY PLOTS FOR 25% OFFSET 22 KINETIC ENERGY VS TIME INTERNAL ENERGY VS TIME TOTAL ENERGY VS TIME
- 23. DISPLACEMENT AND ACCELERATION PLOTS 23 DISPLACEMENT VS TIME Resultant Acceleration VS TIME
- 24. What if Analysis • Increased Reaction load will reduce the injury risk as it wont allow our dummy to move forward or to lean on steering wheel. • Currently we have used hybrid airbag model instead of this we can use Partial/ Molecular airbag. • When we ran the simulation with and without seat belt our HIC value reduced considerably. • Changing the buckle location of the seatbelt will restrained the dummy and hence will reduce the injury. • We can control pressure and volume of the airbag. 24
- 25. Conclusion • From the literature review and simulations we can conclude that the Side impact is the most fatal type of vehicle crashes. • If we closely observe the Dummy after impact we can see that the dummy would have severe injuries in head and multiple fractures is Ribs, Pelvis and shoes resulting into fatality. • The side airbag, seatbelt plays a very important role in keeping the driver safe. 25