| In this study, the flow properties of various structural steels were estimated by analyzing the indentation load-depth curve obtained by ball indentation and the pile-up or sink-in phenomenon around indentation. In deriving the true stress-true strain curve, the representative strain ε_R was obtained by considering the deformation behavior beneath the indenter. And the representative stress σ_R was obtained by using the relation P_m / σ_R = Ψ for fully plastic stage, where P_m is the mean contact pressure. The constraint factor Ψ was then related to the work-hardening characteristics of material in this study. For various steels such as TMCP, SM50, SA508, SA213, SA106, and AISI1025, the results of indentation test were compared to those of tensile test, which shows that the present analysis can predict successfully the plastic flow properties of structural steels. |
|
