Despite the high fatality rate due to rollover, this topic little features as a focus of research, when compared to studies on frontal and side collisions. As repeatability issues with the test have meant that there is not yet an established standard for dynamic rollover system that evaluates the safety of rollover of vehicles, the FMVSS 216a Static Roof Crash Resistance is currently applied.

The objective of this paper is to simulate the behavior of crash-test dummies and the deformation of a vehicle body by numerical analysis considering not only bending and torsional modulus, but also the collapse characteristics of main members.

We can find the effect of each member on the SWR of vehicle at the static test (FMVSS 216a), and the effect of SWR on the maximum acceleration value of head. The stiffness of the B-pillar is main member for increasing the SWR value as we know. Next, the A-pillar and center cross member. In terms of the maximum acceleration value of head, this value increases as the SWR of vehicle rises.

We conclude that there exists an appropriate modulus of members in order to decrease the maximum acceleration of head, and particular airbags need to sustain the pressure for about 3.5 sec in order to prevent the ejection of the crash-test dummies.