Correlation of Occupant Evaluation Index on Vehicle-occupant-guardrail Impact System

Abstract

Aiming at the occupant safety risk assessment of vehicle guardrail impact, a finite element model of vehicle-occupant-guardrail impact system was established and the validation of the model was verified based on the test result. Different impact speed such as 60 km/h, 80 km/h, 100 km/h, 120 km/h and different impact angle such as 25°, 30°, 35°were selected and combined to conduct 12 groups of vehicle guardrail impact simulation test by Hyper Mesh and LS-DYNA. The Acceleration Severity Index (ASI), Theoretical Head Impact Velocity (THIV), Post-impact Head Deceleration (PHD) and Head Injury Criterion (HIC) were analyzed by obtaining the longitudinal, transverse and vertical acceleration data of vehicle centroid and occupant head in the impact process. Quantitative corresponding relations between other occupant risk assessment index and Head Injury Criterion (HIC) was analyzed by SPSS, and the results showed that ASI and HIC had good correlation. Fitting degree between ASI and HIC is 0.93 with the exponential function. The study results of occupant would have guiding significance for related standards’ development and revision of related standard, experimental study and product development.