The Prediction of Transient Responses of Spinal Motion Segments Using Finite Elements Based on Porous Medium Theory
Alternative formulations for the prediction of the dynamic behavior of spinal motion segments simulated as the poroelastic finite element models are studied. The mechanical significance of the fluid phase in the spinal motion segment is demonstrated in the long-time creep and the transient responses. Constitutive laws and alternative approaches for deriving various models are briefly discussed. Proper algorithms for temporal discretizations of the solid-fluid coupled equations of motion are implemented. From the results of computations carried out from various models, the imposition of prescribed pore fluid pressures may give better agreement with that of experimental observations.
KeywordsPorous Medium Transient Response Solid Skeleton Vertical Deflection Solid Displacement
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