Abstract: The rear-row female chest is the emphases lost score position in the frontal impacting test in the
new China New Car Assessment Program (C-NCAP). The research of female chest injury influencing factors is
passive safety emphases. The authors investigated the sternum rigidity for 5% male dummy, the seat belt action
effect, the seat belt action time, the dummy relative move using a contrast method between a rear-row female
dummy and a front-row 50% male dummy in twelve frontal impacting tests at 50 km/h. The results show that
female dummy sternum rigidity islower than male, about half of it, when using a general seat belt, and that the
effective action start time is about 30 mslater than male, and a sudden-hold impacting occurred in the impact
end stage; and that the chest injury severity of the rear-row female dummy in impaction with using seat belt by a
5% female dummy is designed for 50% male dummy. Therefore, a higher rigidity of vehicle front part can make
a better protection for female dummy chest.

Key words: vehicle safety, impacting test, female dummy&rsquo, chest injury, seatbelt action, relative move, vehicle front rigidity