Experimental tests using porcine brainstem samples were performed on a custom designed stress relaxation shear device. Tests were performed dynamically at strain rates >1 s−1, to three levels of peak strain (2.5%-7.5%). The directional dependence of the material properties was investigated by shearing both parallel and transverse to the predominant direction of the axonal fibers.Quasi-linear viscoelastic theory was used to describe the reduced relaxation response and the instantaneous elastic function. The time constants of the reduced relaxation function demonstrate no directional dependence; however, the relative magnitude of the exponential functions and the parameter representing the final limiting value are significantly different for each direction. The elastic function qualitatively demonstrates a dependence on direction.These results suggest that the brainstem is an anisotropic material. The data provides a starting point for analyzing the directionally dependent nature of brainstem material and can serve as a guide in developing new material models for finite element analysis.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Biomechanical Characterization of the Constitutive Relationship for the Brainstem


    Weitere Titelangaben:

    Sae Technical Papers



    Kongress:

    39th Stapp Car Crash Conference (1995) ; 1995



    Erscheinungsdatum :

    01.11.1995




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Biomechanical characterization of the constitutive relationship for the brainstem

    Bittenbender Arbogast,K. / Meaney,D.F. / Thibault,L.W. et al. | Kraftfahrwesen | 1995


    Biomechanical Characterization of the Constitutive Relationship for the Brainstem

    Arbogast, K. B. / Meaney, D. F. / Thibault, L. E. et al. | British Library Conference Proceedings | 1995


    New constitutive relationship of incompressible hyperelasticity

    Zhao, G. / Wang, S. | British Library Online Contents | 1998


    In Situ Autonomous Biomechanical Characterization

    Boukallel, Mehdi / Girot, Maxime / Régnier, Stéphane | Springer Verlag | 2006


    Constitutive Relationship of Asphalt Mixture for Finite Element Method

    Wu, S. / Wang, H. / Yao, Y. | British Library Conference Proceedings | 2009