Introduction of a thermodynamically hyperelastic model for peat
Citation:
Zhang L. and O'Kelly B.C., Introduction of a thermodynamically hyperelastic model for peat, Numerical Methods in Geotechnical Engineering - Proceedings of the Eighth European Conference on Numerical Methods in Geotechnical Engineering (NUMGE 2014), Delft, the Netherlands, 18?20 June 2014, Hicks M.A., Brinkgreve R.B.J. and Rohe A., 1, CRC Press, 2014, 133 - 137Download Item:
2014_Introduction of a thermodynamically hyperelastic model for peat_Proceedings 8th European NUMGE Conference.pdf (Published (author's copy) - Peer Reviewed) 182.4Kb
Abstract:
Peat is a complex geomaterial having extremely high water content, low shear strength and
undergoes large deformations under loading. Based on the volume fraction concept, this paper presents a basic
hyperelastic biphasic material model for saturated amorphous (fully decomposed) peat. It has been a common
practice to study hydraulic (volumetric) and mechanical (deviatoric) processes separately, although this division is artificial and disregards the complete stress-deformation response of a soil. The present study presents
a hyperelastic model implemented within a thermodynamically consistent approach of coupled hydraulic and
mechanical processes, thereby eliminating associated artificial separation errors. This phenomenological material model has been implemented inABAQUS using the user subroutine UMAT. In order to adequately capture
the complex geomechanical behaviour of peat, future work should include the addition of viscoelasticity, creep,
structural anisotropy and (when extending to larger strains) plasticity to the basic hyperelastic model presented.
Sponsor
Grant Number
Irish Research Council for Science and Engineering Technology (IRCSET)
RS/2011/271
Author's Homepage:
http://people.tcd.ie/bokellyDescription:
PUBLISHEDDelft, the Netherlands
Author: O'Kelly, Brendan
Other Titles:
Numerical Methods in Geotechnical Engineering - Proceedings of the Eighth European Conference on Numerical Methods in Geotechnical Engineering (NUMGE 2014)Publisher:
CRC PressType of material:
Conference PaperSeries/Report no:
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