Recent military conflicts have resulted in an increase in the number of blast related traumatic brain injuries. The present project examines the mechanical effects in a brain impinged upon by a blast wave as simulated by a finite element coupled fluid-solid framework. Various sources of errors were assessed and conclusions are (a) the least important source of error was the assumption of linear kinematics and linear constitutive equation; (b) the discretization error was significant, and controlling it will remain a challenge; and (c) the most significant source of error was found to be the uncertainty of the input parameters (experimental variability) and the lack of knowledge of the detailed micro-mechanics of deformation of the brain tissues under conditions of blast loading.
In collaboration with Mark W. Bondi, Samuel R. Ward, and Lawrence R. Frank, UCSD/VA San Diego Healthcare System. Project was supported by Dr. Frank Stone and Dr. Ernie Young at the Chief of Naval Operations, Environmental Readiness Division
Photo: Acoustic pressure (red positive, blue negative) in the cortex. (Snapshots spaced ~0.035 ms).