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A technique for using strain gauges to evaluate airbag interaction with cadaveric upper extremities
S M Duma1, C R Bass, G S Klopp
1University of Virginia, Automobile Safety Laboratory, Charlottesville 22902, USA.
Biomedical Sciences Instrumentation
|January 1, 1997
Summary
This study developed a strain gauge method to measure forearm bone loading during airbag deployment. The technique accurately captured strain rates and bending moments, aiding in understanding radius and ulna fractures.
Area of Science:
- Biomechanics
- Orthopedic Surgery
- Forensic Engineering
Background:
- Airbag deployment can cause radius and ulna fractures.
- Existing literature reports these injuries but lacks detailed loading data.
Purpose of the Study:
- To present a method for evaluating upper extremity loading during airbag deployment using strain gauges.
- To quantify strain rates, bending moments, and fracture timing in radius and ulna bones.
Main Methods:
- Laboratory experiments were conducted on eight cadaveric upper extremities.
- Strain gauges (350 omega, 5% strain planar rosettes) were attached to the anterior and posterior surfaces of the radius and ulna mid-shaft.
- Minimally invasive incisions, specific bonding agents, and protective covers were used to ensure gauge integrity and data accuracy.
Main Results:
- The strain gauge technique successfully provided accurate data throughout airbag impact simulations.
- The method is capable of measuring strain rates, bending moments, and time of fracture for radius and ulna.
- Planar rosettes proved suitable for bone strain measurement.
Conclusions:
- The developed strain gauge method is effective for assessing upper extremity bone loading during airbag deployment.
- This technique offers valuable insights into the biomechanics of airbag-induced forearm fractures.
- Accurate data acquisition is crucial for understanding injury mechanisms and improving safety designs.