O złożonych modelach wzmocnienia plastycznego

Simple models of isotropic or kinematic workhardening when combined with flow rule are not capable to describe complex phenomena occurring during plastic deformation for non-proportional loading programmes, especially for cyclical loads involving consecutive loading and unloading. A mathematical structure of the plasticity theory with internal state parameters is discussed and some particular models are considered within the framework of a general theory. Comparative results are obtained for three different loading programmes. Some previous theories are also briefly reviewed in the paper.