Identifying the mechanical behaviour of brain tissue in both shear and compression

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Hrapko, M.¹; Gervaise, H.¹; van Dommelen, J. A. W.¹; Peters, G. W. M.¹; Wismans, J. S. H. M.¹

Identifying the mechanical behaviour of brain tissue in both shear and compression

Proceedings of the 2007 International IRCOBI Conference on the Biomechanics of Impact

Affiliations

¹Material Technology Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
Abstract and keywords

The objective of this work was to validate the non-linear viscoelastic constitutive model of brain tissue that was developed in Hrapko et al. (2006) and has shown to provide a good prediction of the shear response. The model predictions were compared to compression re- laxation results up to 20% strain of porcine brain tissue samples. Compression and shear results were obtained from the same samples to reduce the effect of inter-sample variation. Compression measurement results with and without initial contact of the sample with the loading plate were compared. The influence of a fluid layer surrounding the sample and the effect of friction were examined and were found to play an important role during compression measurements.

The model has been implemented in the explicit Finite Element code MADYMO. Model simulations with varying boundary conditions are used to interpret the compression results. Simulations using the non-linear constitutive model and its linearised version in a 3-D head model showed a difference in the maximum stress and strain responses of 20% and 50%, respectively.

Keywords: brains; soft tissues; constitutive models; viscoelasticity

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Year	Entry
2009	Périchon N, Oudry J, Chatelin S, Sandrin L, Allemann P, Soler L, Willinger R. In vivo liver tissue mechanical properties by transient elastography: comparison with dynamic mechanical analysis. In: Proceedings of the 2009 International IRCOBI Conference on the Biomechanics of Impact. September 9-11, 2009; York, UK.57-68.
2014	Patton DA. The Biomechanical Determinants of Sports-Related Concussion: Finite Element Simulations of Unhelmeted Head Impacts to Evaluate Kinematic and Tissue-Level Predictors of Injury and Investigate the Design Implications for Soft-Shell Headgear [PhD thesis]. University of New South Wales; March 2014.