Abstract
The surface chemical potential field represents the tendency for an elastic solid to lower its free energy by means of mass rearrangement. In a recent paper in this Journal, Wu, 1996[ J. Mech. Phys. Solids 44, 2059–2077] pointed out that the commonly used definition of chemical potential for elastic solids is inconsistent with the change in free energy of the system associated with shape change at finite strain. The purpose here is to rederive Wus main result by a direct rate calculation, rather than a variational approach, which appears to be simpler in implementation. In addition, the definition is generalized to include orientation dependence of surface energy.
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