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

Determining the strength properties of individual layers of strained laminated composites by kinetic indentation

“…The results were averaged over five tests for each indenter. Since the method [4] implies the use of conical indenters, we found, as is customary [8,9], the equivalent conical indenters with interfacial angles of 97°, 129°, and 140.6°, respectively, for the above pyramidal indenters from the equality of the surface areas of projections. The use of conical indenters in modeling allowed us to solve the problem in the axially symmetric formulation instead of the volumetric one, thus considerably reducing the amount of calculations.…”

“…These data were used to determine the empirical coefficients in Eq. (1) for approximation by the algorithm described in [4].…”

“…To reconstruct the strain hardening curve from the results of kinetic indentation, we used the method from [4]. We assumed that the strain hardening curve may be described analytically in the form of a three parameter power dependence (1) where σ y is the yield strength, a 1 and a 2 are coefficients, and ε is the degree of plastic strain.…”

“…In previous works, we developed, tested, and adapted a method for obtaining a strain hardening curve from the results of tests on the impression of three conical indenters with different cone angles with the use of a portable hardness gauge [4]. The method of kinetic indentation allows the estimation of local mechanical properties, thus providing an important advantage in the study of composites when their decomposition into individual components is impossible or undesirable.…”

Finite element simulation of nanostructuring burnishing

“….ragment of the computation grid near the indenter surface contact point. [30]. The strain hardening diagram was analytically described as the three-parametric power dependence …”