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Traumatic Brain Injury l: Introduction

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Low-intensity Blast Wave Model for Preclinical Assessment of Closed-head Mild Traumatic Brain Injury in Rodents

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Published on: November 6, 2020

Mechanical response of brain tissue under blast loading.

Kaveh Laksari¹, Keyanoush Sadeghipour¹, Kurosh Darvish¹

¹Department of Mechanical Engineering, College of Engineering, Temple University, 1947N, 12th Street, Philadelphia, PA 19122, United States.

Journal of the Mechanical Behavior of Biomedical Materials

|January 25, 2014

Summary

Understanding blast wave propagation in brain tissue reveals that nonlinearity and rate dependence are critical. These factors can lead to shock waves, potentially causing microstructural nervous tissue injury due to high stress gradients.

Keywords:

Blast loading Brain tissue Nonlinear viscoelasticity Shock wave propagation

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Area of Science:

Biomechanics
Neuroscience
Materials Science

Background:

Blast loading poses a significant risk of traumatic brain injury.
Understanding stress wave propagation in brain tissue is crucial for injury prediction.
Nonlinearity and rate dependence of brain tissue significantly influence mechanical behavior under impact.

Purpose of the Study:

To develop a framework for understanding stress wave propagation in brain tissue under blast loading.
To investigate the role of tissue nonlinearity and rate dependence in wave steepening and shock formation.
To propose a mechanism for microstructural nervous tissue injury resulting from blast-induced shock waves.

Main Methods:

Characterized brain tissue as a quasi-linear viscoelastic (QLV) material.
Developed a nonlinear constitutive model for brain tissue across a range of loading rates (medium to blast).
Analyzed the potential for shock wave development within the brain under high-rate compressive pressure waves.

Main Results:

Tissue nonlinearity and rate dependence are key predictors of mechanical behavior under blast loading.
Traveling stress waves can steepen and evolve into shock discontinuities within brain tissue.
Shock wave formation is possible in the brain in response to high-rate compressive pressure waves.

Conclusions:

The developed framework aids in understanding blast wave propagation in brain tissue.
High stress gradients at shock fronts are proposed as a mechanism for microstructural nervous tissue injury.
The study highlights the importance of nonlinear and rate-dependent material properties in blast injury biomechanics.