Determination of the stress-strain state when examining the limiting plasticity of porous parts

The deformation (stamping) of sintered powder blanks is one of the widely u sed methods of producing components of metallic powders. Usually, the powde r metals have lower ductility than monolithic metals and, consequently, the problem of their deformability without fracture is very important. The def ormability of metals in plastic deformation is evaluated on the basis of th e limiting plasticity diagrams, characterizing the variation of the strain of the material to fracture in relation to the parameter of the stress stat e [1]. To construct such diagrams, specimens are tested to fracture at diff erent parameters of the stress state.