The application of the new mean strain criterion (NMSC)

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Stalnaker, R. L.¹; Lin, C. A.²; Guenther, D. A.¹

The application of the new mean strain criterion (NMSC)

Proceedings of the 1985 International IRCOBI/AAAM Conference on the Biomechanics of Impact

Affiliations

¹Department of Mechanical Engineering, The Ohio State University, Columbus, Ohio 43210

²Transportation Research Center of Ohio, East Liberty, Ohio 43319
Abstract

The Mean Strain Criterion (MSC) is now over ten years old. This head injury criterion was formulated on many head impacts to subhuman primates and then extrapolated to humans by dimensional analysis. Also, the connection between force-time input for the primates and acceleration-time input for dummies was made without justification. Add to this a recent interest in having a head injury criterion which predicts AIS numbers 0 through 6 and it becomes of interest to rework the MSC into a new criterion.

This study, based on the MSC concept, inputs the head impact force from cadaver head impacts into the MSC mechanical impedance two—mass head models to generate a new criterion, "The New Mean Strain Criterion" (NMSC). This was done by remodeling the old MSC head impedance model for four directions.

The model system equations were then solved to obtain the model input force and the model output deflection. The deflection was then used to obtain the human equivalent strain and strain rate, and thus, the potential for injury.

The results show that given a force-time trace for humans or an acceleration-time trace for dummies, the NMSC is useful in predicting the potential for injury during a translational head impact.

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Cited By (16)

Year	Entry
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1990	Stalnaker RL, Rojanavanich V. A practical application of the translational energy criteria: evaluation of baseball and softball head impact injury potentials. In: Proceedings of the 1990 International IRCOBI Conference on the Biomechanics of Impact. September 12-14, 1990; Lyon, France.225-243.
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2014	Patton DA. The Biomechanical Determinants of Sports-Related Concussion: Finite Element Simulations of Unhelmeted Head Impacts to Evaluate Kinematic and Tissue-Level Predictors of Injury and Investigate the Design Implications for Soft-Shell Headgear [PhD thesis]. University of New South Wales; March 2014.
2020	Gabrieli DJ. Multiscale Predictions of Mechanical Response and Computational Circuit Dynamics After Traumatic Brain Injury [PhD thesis]. Philadelphia, PA: University of Pennsylvania; 2020.