PROCESS DETERMINING INDEX OF DEFORMATION OF MATERIAL Russian patent published in 1999 - IPC

FIELD: study of mechanical characteristics of pressed materials evaluating their plastic properties, in particular. SUBSTANCE: axially symmetric sample is deformed by pressing via conical die and crack is fixed. Axially symmetric sample has variable section and index ψ^* is calculated by formula , where μ is Poisson's ratio of material; d_o is initial diameter of section of sample in which crack is fixed; d₁ is final diameter of deformed sample; α_м is inclination angle of generator of working cone of die with deformation axis. EFFECT: determination of physical and mechanical characteristics of material evaluating plastic properties. 1 dwg