Abstract
Split Hopkinson Pressure Bars are used to study dynamic material response in uniaxial compression, tension or torsion. Modifications of traditional test techniques have permitted the successful measurement of highly elastic soft biological tissue properties. Testing biological materials, specifically brain material, using the modified Split Hopkinson Pressure Bar method is effective in characterizing the tissue response at strain levels and strain rates that are greater than traditional tissue testing modalities. The high strain rate material properties are of particular interest for use in constitutive models that govern material response and injury predictions for computational models of the human body exposed to dynamic impact events. Since the use of viable brain material is critical, and the viability largely depends on post mortem interval, harvesting fresh, non-frozen brain tissue is critical. In this paper, we present the shear response of fresh human brain tissue under high rate loading. The investigated strain rates ranged from 25 to 248 strain/s. Specimen were prepared from various orientations and locations within the brain across two specimen. The average elastic modulus was 13.0 ± 10 kPa computed across all trials. The response was also characterized based on specimen, loading rate, and strain level to analyze contributing factors. This information is critical for targeting surrogate material properties and generating parameters for computational model constitutive equations.
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Acknowledgement
This effort was partially funded by contract # W81XWH-09-2-0168 with the U.S. Army Medical Research Acquisition Activity, 820 Chandler Street, Fort Detrick MD 21702-5014 as the awarding and administering acquisition office as well as contract # W911QY-09-C-0058 awarded by the Office of Naval Research and the Naval Health Research Center. The content included in this work does not necessarily reflect the position or policy of the U.S. government.
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Ott, K.A., Armiger, R.S., Wickwire, A.C., Iwaskiw, A.S., Merkle, A.C. (2013). Determination of Simple Shear Material Properties of the Brain at High Strain Rates. In: Chalivendra, V., Song, B., Casem, D. (eds) Dynamic Behavior of Materials, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4238-7_18
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DOI: https://doi.org/10.1007/978-1-4614-4238-7_18
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