Within the framework of nonlinear deformation theory an approach describing plastic deformations kinematics of continuous media is suggested. It is based on tensorial separation of elastic from plastic deformations:

We study dynamics and thermodynamics of plastic continuous medium, derive evolution equations including phenomena of mass and heat transport, viscous friction, elastic and plastic deformations. We introduce a metrological parameter for describing plasticity of continuous media. Applications of the theory to numerical simulation of plastic deformations on the nanoscale are discussed.