Abstract:

Evaluation analysis research was carried on the head, chest, and leg hurt of occupant body in
frontal crash by using a human body model, the fourth generation THUMS (Total Human Model for Safety).
A finite element model (FEM) of restraint system was established using a dynamic nonlinear explicit finite
element method based on a domestic SUV (sports utility vehicle) component test and frontal crash test with
a Hyperworks as processor and with a dynamics analysis software LS-Dyna solver for simulation model. The
results show that the head of the THUMS human body model has no injury risk with the skull maximum stress
of 2.4 MPa and the intracranial pressure of 44 kPa; And the legs have no injury risk because of the maximum
strain of 0.4% for both the femur and the tibia, and the strain of 3.6% for right and left anterior cruciate ligament.
The rib strain is above 3% with the chest compression up to 30 mm, these make a 30% probability of AIS
(abbreviated injury scale) damage grade level 3 for concise chest. Therefore, the chest injurie has the most
possibility in the collision condition.

Key words: vehicle safety, frontal crash, restraint system, occupant injury, THUMS human body model