The Viscous Criterion
(VC) is an experimental measure developed by the automotive industry to assess injury
risks for high-speed impacts. The Blunt Criterion
(BC) is a prospective measure developed by the Department of Defense to predict injury
from blunt projectiles.
The range of applicability of BC was extended and compared with VC for its ability to assess injury
risk using published cadaver and animal data. Department of Defense projectiles were 0.05 to 0.43 kg mass at velocities up to 86 m/s. VC data were generated from impacts with 1.75 to 23.4 kg at 3.6 to 10.2 m/s. Chest and abdominal injuries ranged from Abbreviated Injury
Scale scores of 1 to 6.
Both criteria correlated very well with the experimental data, demonstrating correlation coefficients of R
= 0.84 to 0.96. The correlation between VC and BC was R
= 0.99. Logistic probability curves were derived to predict blunt impact
injuries of Abbreviated Injury
Scale scores of 1 to 6 for the chest and abdomen
BC and VC are virtually identical in their ability to assess blunt and ballistic impact injury
risks. They are different measures of impact energy absorbed by the body. One is predictive using input parameters, and the other measures the impact response of the body.