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The purpose of the present paper is the derivation of certain new classes of variational principles for material laws and boundary conditions resulting from nonconvex, generally nondifferentiable, potentials. To this end two recently defined notions are employed the “generalized gradient” of Clarke and the “derivate container” of Warge. Several general classes of problems are discussed and the respective variational forms called here hemivariational inequalities are derived. For the respective static problems the equivalence of these forms to the “substationarity” of the potential and complementary energy is discussed. Finally an integral inclusion formulation for certain classes of static problems is presented.
Acta Mechanica – Springer Journals
Published: Jan 31, 2005
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