AI Article Synopsis
- Research indicates that rear seat occupant protection has declined over the years, potentially linked to increased front-end stiffness in vehicles.
- Higher strength steels and thicker metal sheets were used to adjust vehicle stiffness in simulations, revealing that increased stiffness significantly raised the risk of serious head injuries from 4.8% to 24.2%.
- Additionally, the risk of chest injuries also increased slightly, aligning simulation results with real-world accident data.
Article 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.
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| http://dx.doi.org/10.1016/j.aap.2014.01.004 | DOI Listing |
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