Equations of motion and boundary conditions of incremental rate type for polar continua

The relations between various couple stress tensors and their change rates are derived. The equations of angular momentum and the corresponding bounda ry conditions of incremental rate type are presented. Thus the equations of motion and the boundary conditions of incremental rate type of Cauchy form , Piola form and Kirchhoff from for polar continua are obtained in combinat ion of these results with those for classical continuum mechanics derived b y kuang Zhenbang.