Slip line field theory and its applications in plastic deformation

As a plastic deformation method, Slip line field theory, has better approximation compared to ?slab method? and ?upper bound theory? in many plastic deformation applications despite having certain limitations. Although the theory has been improved and having some application in the plane-strain plastic working in time, as the problems get more complicated it in the meantime, the theory has no longer been considered as a primary method. Nevertheless, the existence of solutions for the particles that have certain geometrical properties and symmetry makes it a useful one among other analysis techniques. Keywords: Plane strain deformation, slip line field theory, plasticity