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The Prediction of Transient Responses of Spinal Motion Segments Using Finite Elements Based on Porous Medium Theory

  • J. S. S. Wu
  • J. C. Huang
  • T. M. Lee
  • B. R. Simon
Conference paper

Summary

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.

Keywords

Porous Medium Transient Response Solid Skeleton Vertical Deflection Solid Displacement 
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References

  1. 1.
    Urban, J. and Maroudas, A.: Measurement of Swelling Pressure and Flow in the Intervertebral Disc with Reference to Creep. Engineering Aspect of the Spine, c 132/80, 1980, pp. 63–69.Google Scholar
  2. 2.
    Wu, J.S.S.: Dynamic Analyses of Porous Medium Problems by the Finite Element Method. Ph.D. Dissertation, A.M.E. Dept., The UNiversity of Arizona, Tucson, AZ 85721, U.S.A. (1984).Google Scholar
  3. 3.
    Biot, M.A.: Mechanics of Deformation and Acoustic Propagation in Porous Media. J. App. Physics, Vol. 33, No. 4, April 1962, pp. 1482–1498.MathSciNetADSMATHCrossRefGoogle Scholar
  4. 4.
    Wu, J.S.S.: Dynamic Analyses of Porous Medium Problems by the Finite Element Method. Research Report NSC74–0401-E005–01 National Science Council, Taipei, Taiwan, The Republic of China (1985).Google Scholar

Copyright information

© Springer Japan 1986

Authors and Affiliations

  • J. S. S. Wu
    • 1
  • J. C. Huang
    • 1
  • T. M. Lee
    • 1
  • B. R. Simon
    • 2
  1. 1.Department of Mechanical EngineeringNational Chung-Hsing UniversityTaichung, TaiwanChina
  2. 2.Aerospace and Mechanical Engineering DepartmentThe University of ArizonaTucsonUSA

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