The derivation of the fundamental equations of the couple-stress theory presented in this section is mainly based on paper  by W. T. Koiter with certain modifications. The indicial notation (Cartesian tensors) is used throughout the paner. The summation convention holds for repeated indices (except for the index n denoting the direction normal to the surface). The permutation symbol is denoted єijk hic and assumes the values of +1, −1, 0, depending on whether the permutation of indices is even, odd or some indices are repeated. Vectors, denoted in print by bold-face letters, are underlined in this text.
KeywordsFundamental Equation Strain Energy Function Deviatoric Part Indicial Notation Cartesian Tensor
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