A numerical study on the safety belt-to-pelvis interaction
Journal article, 2022

The slide of the lap belt over the iliac crest of the pelvis during vehicle frontal crashes can substantially increase the risk of some occupant injuries. A multitude of factors, related to occupants or the design of belt, are associated with this phenomenon. This study investigates safety belt-to-pelvis interaction and identifies the most influential parameters. It also explores how initial lap belt position influences the interaction between lap belt and pelvis. A finite element model of the interaction between lap belt with pelvis through a soft tissue part was created. Belt angle, belt force, belt loading rate and belt-to-body friction as belt design parameters, and pelvis angle, constitute parameters of soft tissue, and soft tissue-to-pelvis friction as occupant parameters were inspected. For the soft tissue part, subcutaneous adipose tissue with different thicknesses was created and the effect initial lap belt position may have on lap belt-to-pelvis interaction was investigated. The influential parameters have been identified as: the belt angle and belt force as belt design parameters and the pelvis angle and compressibility of soft tissue as occupant parameters. The risk for the slide of lap belt over the iliac crest of the pelvis was predicted higher as the initial lap belt positions goes superior to the pelvis. Of different submarining parameters, the lap belt angle represents the most influential one. The lap belt-to-pelvis interaction is influenced by the thickness of subcutaneous adipose tissue between lap belt and pelvis indicating a higher risk for obese occupants.

adipose tissue

human body models



lap belt-to-pelvis interaction


Hosein Naseri

Chalmers, Mechanics and Maritime Sciences (M2), Vehicle Safety

Johan Iraeus

Chalmers, Mechanics and Maritime Sciences (M2), Vehicle Safety

Håkan Johansson

Chalmers, Mechanics and Maritime Sciences (M2), Dynamics

International Journal for Numerical Methods in Biomedical Engineering

2040-7939 (ISSN) 20407947 (eISSN)

Vol. 38 4 e3572

Future Occupant Safety for Crashes in Cars (OSCCAR)

European Commission (EC) (EC/H2020/769947), 2018-06-01 -- 2021-05-31.

Development of a framework for model predictions with error control with application to human adipose tissue

Swedish Research Council (VR) (621-3909), 2014-01-01 -- 2017-12-31.

Areas of Advance


Subject Categories

Applied Mechanics

Water Engineering

Bioinformatics (Computational Biology)


C3SE (Chalmers Centre for Computational Science and Engineering)



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