Abstract
To perform simplified study of occupant displacement and chest deflection of THOR dummy under full width frontal crash test, two-dimensional degenerated model was created. The model was constituted from four rigid bodies, which represents head, upper body, sternum, and lower body. The translational spring was used between upper body and head, and same between upper body and sternum. The rotational joint was used between upper body and lower body. As a result, as for chest deflection and displacements of head, upper body, and lower body, similar results were obtained comparison with actual test results.