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Thoracic deformation and velocity analysis in frontal impact
N Yoganandan1, R M Morgan, R H Eppinger
1Department of Neurosurgery, Medical College of Wisconsin, Milwaukee 53226, USA.
Journal of Biomechanical Engineering
|February 1, 1995
Summary
This study measured dynamic chest deformations in human cadavers during frontal impacts. Findings show chest bands can correlate biomechanical variables with thoracic impact injuries.
Area of Science:
- Biomechanics
- Injury Biomechanics
- Automotive Safety
Background:
- Understanding occupant injury mechanisms in frontal impacts is crucial for vehicle safety design.
- Previous research has utilized various methods to assess thoracic response, but dynamic, real-world impact data is limited.
Purpose of the Study:
- To measure dynamic chest deformations and compute chest velocity and viscous criteria during frontal impacts.
- To evaluate the utility of chest bands in capturing temporal deformation patterns.
- To establish thoracic impact tolerance by correlating biomechanical variables with injury.
Main Methods:
- Four unembalmed human cadavers were subjected to frontal impacts on a horizontal sled at approximately 50 kph.
- A three-point belt restraint system was used. Two chest bands recorded temporal deformation patterns.
- Biomechanical data were digitally collected at 12,500 Hz.
Main Results:
- Analysis of approximately 800 temporal deformation contours revealed regional differences in the thorax.
- Mean maximum normalized chest deflections ranged from 0.15 to 0.51.
- Mean maximum chest compression velocities ranged from 1.79 to 4.87 m/s, and peak viscous response variables ranged from 0.15 to 1.95 m/s.
Conclusions:
- Multiple rib fractures were observed in all specimens post-impact.
- Chest band data shows potential for correlating injury with biomechanical variables.
- This study contributes to establishing thoracic impact tolerance in frontal collisions.