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This discussion paper emphasizes the importance of the First Law of Thermodynamics in description of elastic component of elasto-plastic behaviour of soils. To ensure that the First Law is satisfied, existence of energy potential should be assumed. Then the incremental elastic stress-strain relationship is easily derived by double differentiation of this potential. However, when this energy potential is also made dependent on plastic strains, derivation of incremental elastic stress-strain relationship becomes subtler. The authors are to be congratulated on their attempt to introduce thermomechanical principles into soil modelling, yet they seem to overlook this subtlety.
Authors:Einav, I. and Puzrin, Alexander
Index Terms:geomechanics; GeomechanicsGroup; Einav, I.; Puzrin, Alexander
Discussion on Hashiguchi K. & Collins I.
Further Information:Date published: 2002