Abstract: To identify the characteristics of the injury to left rear occupants in car frontal offset collision, simulation studies were conducted. The HyperMesh finite element software was used to build a basic model 1, including a finite element car, a deformable wall, and a dummy. A three-point seat belt was added to the basic model 1, and a model 2 was built. A side airbag was created to the model 2, and a model 3 was built. The Ls-Dyna software was used to solve the calculation, and the HyperGraph software was used to analyze the injury to the dummy under different overlapping rates in offset collisions. A comparison was made between the injuries to the dummy in the basic model 1, model 2 and model 3. The effectiveness of the different restraint systems in protecting the left rear dummy was analyzed. The results show that there isa negative correlation between the collision overlap rate and the acceleration peaks of the left rear occupant'shead and chest, that when the collision overlap rate changes within the test range, the peak fluctuation of the resultant force on the neck is small, that the use of seat belt can significantly reduce occupant damage, and that the side airbag is very effective in protecting the occupant's chest.

Key words: occupant injury, overlap rate, seat belt, airbag, HyperMesh finite element software, offset impact