Transition from engineering strain to the true strain in analytical description of metals hardening

Purpose of the work is related with impossibility correctly estimating strain hardening metals (alloys) in area their large total deformations due to absence additivity traditionally used value engineering g, its nonlinear change values, and data technical literature Hall-Petch coefficient Ai for logarithmic true deformations, which led task correct transition from values 0 < g 50...60 % strainn e 1...3. Methodology. The theoretical analysis regularities deformation carried out, ("true") by analytical representation metal graphs as a function (true) strain. contrast degree presented. Originality. Analytical expressions are presented that allow use known on at small (50...60 %) strains during cold pressure treatment deformations. Practical value. obtained mathematical accumulated experimental alloys processes processing determine strains. These can also be solve metallophysical problems associated compressions.
 Keywords: forming alloys; hardening;