Effects of obesity on occupant responses in frontal crashes: a simulation analysis using human body models

Abstract

The objective of this study is to investigate the effects of obesity on occupant responses in frontal crashes using whole-body human finite element (FE) models representing occupants with different obesity levels. In this study, the geometry of THUMS 4 midsize male model was varied using mesh morphing techniques with target geometries defined by statistical models of external body contour and exterior ribcage geometry. Models with different body mass indices (BMIs) were calibrated against cadaver test data under high-speed abdomen loading and frontal crash conditions. A parametric analysis was performed to investigate the effects of BMI on occupant injuries in frontal crashes based on the Taguchi method while controlling for several vehicle design parameters. Simulations of obese occupants predicted significantly higher risks of injuries to the thorax and lower extremities in frontal crashes compared with non-obese occupants, which is consistent with previous field data analyses. These higher injury risks are mainly due to the increased body mass and relatively poor belt fit caused by soft tissues for obese occupants. This study demonstrated the feasibility of using a parametric human FE model to investigate the obesity effects on occupant responses in frontal crashes.

Keywords::

• obesity
• injury risk
• frontal crash
• human body model

Funding

This research is funded by National Highway Traffic Safety Administration [Cooperative Agreement# DTNH22-10-H-00288], National Science Foundation [Award# 1300815], State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body at Hunan University [Award# 31115015] and Hunan Provincial Innovation Foundation for Postgraduate. The views in this paper are solely those of the authors and do not represent those of the funding agency.