Force based analysis on the instrumented Charpy impact and its industrial application

Abstract
By determination of characteristic loading points from the instrumented impact testing curve and with the combination of the quasi static tensile test, a series of dynamic testing parameters including estimated PSF, σ_yd, F_gy/F_m, J_u, J/σ_yd related to the Force Based Analysis method have been introduced in the study. As a key point to evaluate the dynamic flow yield stress, the confused loading criteria of General Yield point is here clearly marked at the intersection of the steeply rising part of second peak of the force-deflection and KC curves. Moreover, an illustration of FBA method applied to the samples with the same Absorbed Impact Energy, E_t, but the distinct Percentage of Shear Fracture, PSF values was discussed in detail as necessary complements for extending the conventional Charpy impact testing into a comprehensive evaluation of the fracture toughness, also revealing the intrinsic fracture mechanism of metals.