Abstract
In this paper it is shown that the thermodynamic reference stress s o KL which is associated with the state of plastic strain must always be within or on the yield surface. A restriction is therefore imposed on the functions representing the yield surface, the free energy, and strain hardening. An example is given in which s o KL ultimately moves outside the yield surface provided that these functions are not selected properly. The paper also includes a discussion of Drucker's postulate of stability in the small and whether or not this postulate is essential for the theory of plasticity.
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