Chest Deflection
Description
Chest compression is measured for frontal impacts to predict thorax injuries. The maximum chest compression is compared to the chest depth of the dummy.
This metric does not have a separate button. WebSAT reports chest deflection when you select Injury Metrics > CTI or Vehicle Analysis > NCAP. Chest deflection is also an input to Injury Metrics > Viscous Criterion.
Measurements used by WebSAT
- Chest Displacement (X)
How WebSAT processes the data
- Convert the chest displacement to millimeters.
- Filter the deflection at CFC 600.
- Keep the compressive portion of the displacement and report it as a positive magnitude.
- Calculate the peak compression.
- Compare the peak with the applicable reference value.
Reference values and injury risk[1]
| ATD | IARV (mm) |
|---|---|
| HIII - M95 | 70 |
| HIII - M50 | 63 |
| HIII - F05 | 52 |
| HIII - 6yo | 40 |
| HIII - 3yo | 34 |
| CRABI - 12mo | 30 |
References
[1] Mertz, H. J., Irwin, A. L., and Prasad, P. “Biomechanical and Scaling Bases for Frontal and Side Impact Injury Assessment Reference Values.” Stapp Car Crash Journal, 47, 2003, pp. 155–188. SAE Technical Paper 2003-22-0009.