top of page


Mr. John Smith

Job title



In vehicle collisions, the lap belt should engage the anterior superior iliac spine (ASIS) of occupants. Three-dimensional (3D) shapes of bones and soft tissues around the pelvis were acquired using a computed tomography (CT) scan of 10 male and 10 female participants wearing a lap belt in the upright and reclined postures. In the upright sitting posture, the thigh height was larger with a higher BMI while the ASIS height did not change significantly with BMI. As a result, the height of the ASIS relative to the thigh (ASIS-thigh height) became smaller as the BMI increased. Because the thigh height of females was smaller than that of males, the ASIS-thigh height was larger for females than for males. As the ASIS-thigh height was larger, the overlap of the lap belt with the ASIS increased. Thus, the lap belt overlapped more with the ASIS for the females than for the males. In the reclined sitting posture, the lap belt is positioned at the abdominal fold for the high-BMI participants while the lap belt moved to the abdominal area for the low-BMI participants. To evaluate the difference in lap belt/pelvis interaction due to body shape, impact simulations were conducted for rear seat occupants using a human finite element model THUMS. The high and low BMI model were developed by morphing the torso and the thigh shape based on the CT data. For the high BMI model, the lap belt had sufficient time to catch the pelvis due to thick soft tissue around the pelvis. As the pelvis excursion was large and the torso tilted backward, the shoulder belt path moved close to the neck. For the low BMI model, the abdominal soft tissue was thin and the lap belt force concentrated in the upper location of the pelvis. Then, the pelvis tilted rearward, and submarining occurred. The simulation results showed that low BMI occupants had a higher risk for submarining and abdominal injuries.

The lap belt interaction with the pelvis of rear seat occupants in vehicle impacts

EB2012-IBC-004 • Paper • EuroBrake 2012 • IBC


Sign up or login to the ICC to download this item and access the entire FISITA library.

Upgrade your ICC subscription to access all Library items.

Congratulations! Your ICC subscription gives you complete access to the FISITA Library.


Retrieving info...

Available for purchase on the FISITA Store


bottom of page