The risk of soft tissue neck injuries as a result of rear impacts is influenced by both vehicle specific features and the impact severity of the crash. Links between real-world neck injury symptoms and dummy readings as well as neck injury criteria obtained from crash test dummies needs to establish for test methods that evaluate protection against theses injuries.
This study identifies average values of neck injury criteria and dummy readings that correspond to the risk of an adult sustaining soft tissue Neck Injury Symptoms (NIS) persisting for more than one month (NIS>1). Of the real-world crashes in the Folksam database, 25 were selected according to risk levels of NIS>1 associated with mean acceleration intervals: 0% risk and 0-3 g; 0-15% risk and 3-4.5 g; 15-60% risk and 4.5-6 g. The acceleration pulses from the vehicles were reproduced in detail on a sled with a dummy in the same type of seats as in the impacted vehicles.
Various levels of NIC, Nkm, forces from the upper neck load cell and T1 x-acceleration corresponded to the average risk levels of NIS>1 in each interval; 0%, 10% and 30%. The results provide a link between real-world NIS>1 and average dummy readings as well as neck injury criteria obtained from a crash test dummy in sled tests.