Numerical And Experimental Study On
Cerebral Contusion Under Impact Loading
Author(s)
S. Aomura, S. Fujiwara & A. Nishimura
Abstract
The mechanism of brain contusion is investigated using a finite element analysis.
Prior to the numerical calculation for a finite element human head model, the
experimental study of an impact loading for a water-filled acrylic cylindrical
container was carried out in order to observe the fundamental physical
phenomenon and to confirm the validity of the finite element analysis in
comparison with the both numerical and experimental results. After the stroke,
the deflection of the acrylic container wall propagated in both sides of the stroke
point, and large negative pressure was generated just in the opposite side of the
stroke point when deflections from both sides met. The time taken until the
deflection reached the opposite side was close to the natural period of the waterfilled
container and the period of fluctuation of internal pressure was equal to the
natural frequency of the water-filled container. In numerical analysis the
amplitude of the pressure fluctuation was slightly bigger for the tied container
wall-water interface condition than for slide condition, and the damping was
slightly bigger for the slide condition than for the tied condition, although the
numerical and experimental pressure responses resembled each other
approximately. Next, the human head model was analysed by FEM and the result
was compared with the result of the experimental study reported by Nahum and
good agreement was obtained. Five more loading cases were investigated. The
deflection of the skull gave a large effect on the fluctuation of the internal
pressure also for both coup and conrecoup contusions. Although in the frontal,
occipital and under occipital region strokes the intracranial pressure of the coup
and the contrecoup side was almost the same, in the parietal and temporal region
strokes the intracranial pressure in the coup side was bigger than the contrecoup
side.
Keywords: cerebral contusion, coup and contrecoup, impact loading, FEM.
Keywords
cerebral contusion, coup and contrecoup, impact loading, FEM.
Related Book
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