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Roof crush test using LS-DYNA
- 1. Crashworthiness and Occupant Protection in Transportation Systems I ME 8020 Test No.3 ROOF CRUSH OF Truck Presented By: Suravi Banik (fz4276)
- 2. Objective of the Test Roof crush is the failure and displacement of an automobile roof into the passenger compartment during a rollover accident. The relationship between injury levels and intrusion or roof crush has been statistically established, but the mechanism has been thought sometimes to be somewhat obscure. In the early 1970's, the National Highway Traffic Safety Administration (NHTSA) was responsible for the United States becoming the first country in the world to address deaths and serious injures associated with vehicle roof crush. Federal Motor Vehicle Safety Standard (FMVSS) No. 216, "Roof Crush Resistance," became effective on September 1, 1973. The purpose of the standard is to reduce deaths and injuries due to crushing of the roof into the passenger compartment area in rollover crashes.
- 3. Roof Crush Conducted •Truck •With 95th percentile dummy •Rigid wall according to FMVSS
- 4. Model Description Car Model Selected: 1.C1500 Pick Up Truck (NCAC V4); Weight of the truck= 1716.97 kg 3.Dummy: 95th percentile Dummy (weight: 79 kg)
- 5. Full model (Truck_Rigid Wall_Dummy)
- 6. Procedure Original Model run Checking original model of any initial errors Full model run (vehicle airbag dummy) Including airbag Connecting beams Checking consistency of units Positioning dummy Attaching the Rigid wall Test results
- 7. Roof Crush Criteria • Displacement applied 127 mm/.127 m • End time .127 sec • Rigid wall length 1829 mm/ 1.829 m • Rigid wall width 762 mm/.762 m
- 8. Roof Crush of truck 25 ms 50 ms 75 ms
- 9. Roof Crush of truck 100 ms 127 ms
- 10. Roof Crush of truck
- 11. Energy plot (ROOF CRUSH)
- 12. MATSUM
- 13. z-displacement vs time • Node 50115398 was selected and analyzed for the deformation of the roof and a Graph of Displacement vs Time was plotted
- 14. Normal Force vs time
- 15. What if :Trial 1 (Applying displacement 0.5 m and endtime 0.15 sec)
- 16. What if :Trial 1 (Applying displacement 0.5 m and endtime 0.15 sec) 150 ms
- 17. GSTAT data and Matsum
- 18. Z-displacement and Force vs time plot
- 19. What if :Trial 1 (Applying displacement 0.5 m and endtime 0.1 sec with spc)
- 20. What if :Trial 1 (Applying displacement 0.5 m and endtime 0.1 sec with spc) 100 ms
- 21. GSTAT data and Matsum
- 22. Z-displacement and Force vs time plot
- 23. What if :Trial 1 (Applying *parameter) • Increasing the roof thickness and applying ultimate strength
- 24. Observation Disp.127 m and end time 127 ms according to FMVSS Applying Disp. 0.5 m and end time 150 ms Applying nodal constraints Applying parameter (increasing thickness of the roof and ultimate strength)
- 25. Observation Disp .127 m and end time 127 ms according to FMVSS Applying Disp. 0.5 m at time 150 ms
- 26. Observation Applying nodal constraints Applying parameter (increasing thickness of the roof and ultimate strength)
- 27. Conclusion • According to FMVSS as we see from the simulation, the roof is crushed due to 0.127 mm displacement applied • For what if trial 1 when we applied more displacement the deformation is more visible • For what if trial 2 when we applied nodal constraint the dummy tends to move down to the floor and the roof is not so much crushed as trial 1 • For what if the thickness of the roof is more and ultimate strength is used as a parameter, the deformation is less and the injury of the occupants will be less.
- 28. Improvements can be done As the roof and hood are more prone to deformation we should increase the thickness of the roof or we can do some structural improvements like adding beams to the roof which will decrease the deformation and damage to the occupants.