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Volume 7,     Number 1,     Spring 1999

 

BRAIN BIOMECHANICS: STEADY-STATE
CONSOLIDATION THEORY OF HYDROCEPHALUS
G. TENTI, S. SIVALOGANATHAN AND JAMES M. DRAKE

Abstract. In this paper we apply Biot's classical theory of consolidation to the brain in simplified geometry, in order to find explicit formulas for its response to internally applied loads. We show that the observed brain compliance can be understood in terms of Biot's concept of jacketed compressibility, with the result that the Poisson ratio is considerably less than the value 1/2 used in early numerical simulations of hydrocephalus. Using existing data, we also derive approximate values for both the shear modulus and the Poisson ratio of the brain.

 

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