Response of an Impact Test Apparatus for Fall Protective Headgear Testing Using a Hybrid-III Head/Neck Assembly

Area of Science:

• Biomechanics
• Injury Prevention
• Protective Equipment Testing

Background:

• Impact testing of protective headgear is crucial for preventing fall-related injuries.
• Current methods may not fully capture complex head and neck dynamics during impact.
• Assessing both linear and angular acceleration is essential for comprehensive head injury analysis.

Purpose of the Study:

• To investigate a novel test method for impact testing of protective headgear.
• To assess the potential of a Hybrid-III head and neck assembly for evaluating headgear performance.
• To explore the inclusion of angular acceleration measurement in headgear impact testing protocols.

Main Methods:

• Utilized a modified twin wire drop test system with a Hybrid-III head and neck assembly.
• Incorporated measurement of both linear and angular acceleration.
• Varied parameters including neck stiffness, anvil type, and drop orientation (front, rear, side).

Main Results:

• The test apparatus demonstrated reasonable repeatability for linear acceleration (CV 0.4-6.7%).
• Angular acceleration measurements showed higher variability (CV up to 16.3% in side drops).
• Injury metrics included maximum linear/angular acceleration, Head Injury Criteria (HIC), Rotational Injury Criteria (RIC), and PRHIC.

Conclusions:

• The developed drop test apparatus provides a repeatable method for protective headgear impact assessment.
• The inclusion of angular acceleration measurement enhances the evaluation of headgear's injury reduction potential.
• This method shows promise for future research and development of headgear to mitigate head impact injuries from falls.