Determination of metal strain-hardening curves from conical-indenter impression results

A new technique to determine the strain resistance of metal with a pronounced yield strength is proposed. As an approximation of the curves of the strain-hardening resistance of metals, a three-parameter function is used, which optimally describes the form of real curves. Three conical indenters with different taper angles are used. Multiple simulations of indenter impression into a metal by the finite-element method are carried out. As a result, a functional correlation is found between the parameters of the function approximating the hardening curves and the diagrams of conical-indenter impression into an elastoplastic medium. It is experimentally shown that the curves of strain hardening can be quite accurately determined by the proposed technique.