Finite straingradient plasticity the ory for high speed machining

AbstractTo better understand the complex phenomenainvolvedinthecuttingprocessisto better qualify the behaviour law used in the simulation of machining processes (analytical and finite element modeling). The aim of this paperisto present the choices made regarding the behaviour law in this context, indeed, commonly used behaviourlawssuchas Jonhson-Cook can bring unsatisfactory results especially for high strain and large deformation processes. This study de- velopsa large deformation strain-gradient theoretical framework with hypothesis linked with to metal cutting processes. The emphasis of the the oryis placed on the existence of high shearp henomena creating a texture in the primary shear band. To account for the texture, the plastic spinis supposed to berelevant in this theory. It is shown that the the oryas the capability of interpreting the complex phenomena found in machining and more particularly in highspeed machin- ing