Drawing and extrusion of composite sheets, wires and tubes (Q796343)

Some basic steady forming processes, in particular drawing and extrusion, of composite (multilayered) metal sheets, wires and tubes are analyzed within the framework of continuum plasticity. Material behaviour is modelled as rigid/perfectly-plastic and a radial flow pattern is assumed within the working zone. Simplified versions of the respective Nadai-Hill and Shield radial flow solutions are used for the description of the stress field and velocity profile in each phase (layer). The matching requirements along the interfaces between the different layers, together with the friction conditions at the walls and the entry/exit load specification, lead to a system of algebraic equations that admit a simple solution.