The influence of the vehicle hood inclination angle on the severity of the pedestrian adult head injury in a front collision using finite element modeling

摘要

In-vehicle to pedestrian collisions, the main reason for fatal injuries is the pedestrian to vehicle impacts, which are caused by the direct impact of the pedestrian head to the front part of the automotive hood during a collision. This paper deals with the development of a new finite element model to simulate the car-to-pedestrian front impacts between the adult headform and vehicle hood composite structures according to the EURO-NCAP requirements. The pedestrian head impacted by selected three points over the outer structure of the hood with three different inclination angles. The HIC values for engine hood structure with different stacking sequences: [[0, 90, 45, -45](2), 0, 90](S), [0, 90](10) and [[0, 90, 45, -45](2), [0, 90](6)] at 6 degrees, 8 degrees and 10 degrees inclination angles have been investigated and discussed. The effects of the inclination angles to HIC value, displacement, and absorbed energy of the vehicle hood composite structures have been investigated and compared. The results show that for all the stacking sequences of the hood structures at (A) head impact point, HIC values found to be less than 2000. Which, means all the structures at this point with different inclination angles satisfied the requirements of pedestrian safety. The energy-absorbing found to be higher in (A) head impact point for all the stacking sequences due to the engine hood stiffness variation at this point is different compared with other points (B and C). This model can be an appropriate tool for the car-to-pedestrian front impacts evaluation and related development on the composite structure of the hood with different inclination angles.