title: High strength steels, stiffness of vehicle front-end structure, and risk of injury to rear seat occupants.
abstract: Previous research has shown that rear seat occupant protection has decreased over model years, and front-end stiffness is a possible factor causing this trend. In this research, the effects of a change in stiffness on protection of rear seat occupants in frontal crashes were investigated. The stiffness was adjusted by using higher strength steels (DP and TRIP), or thicker metal sheets. Finite element simulations were performed, using an LS Dyna vehicle model coupled with a MADYMO dummy. Simulation results showed that an increase in stiffness, to the extent it happened in recent model years, can increase the risk of AIS3+ head injuries from 4.8% in the original model (with a stiffness of 1,000 N/mm) to 24.2% in a modified model (with a stiffness of 2,356 N/mm). The simulations also showed an increased risk of chest injury from 9.1% in the original model to 11.8% in the modified model. Distribution of injuries from real world accident data confirms the findings of the simulations.
authors: Massachusetts Institute of Technology, 77 Mass Ave, room 5-218B, Cambridge, MA 02139, USA. Electronic address: elhams@mit.edu.
authors: Elham
authors: E
authors: Sahraei
authors: The George Washington University, Washington, DC, USA.
authors: Kennerly
authors: K
authors: Digges
authors: The George Mason University, Fairfax, VA, USA.
authors: Dhafer
authors: D
authors: Marzougui
authors: The George Washington University, Washington, DC, USA.
authors: Kim
authors: K
authors: Roddis
mesh_terms: D001336:Automobiles / Q000592:standards*; D004867:Equipment Design / Q000592:standards*; D006801:Humans; D008348:Manikins; D012306:Risk; D012622:Seat Belts; D013232:Steel; D014947:Wounds and Injuries / Q000517:prevention & control*
chemical_list: D013232:Steel
keywords: Finite element model; Rear sear occupant; Risk of injury; Vehicle stiffness