Publikacje

Abstract:

The most often observed failure mechanisms in metallic alloys are divided in two groups: brittle and ductile. Brittle failure mechanism may proceed along grain boundaries (failure due to the creep process or aggressive environment) or along the cleavage planes within the grain. Ductile fracture mechanism is most often the result of voids nucleation–growth–coalescence process or by dislocation slip along slip planes. Tests were performed at three different temperatures: +20°C, –20°C, –50°C, on five different specimens geometries, designed to provide different stress triaxialities, Lode factors as well as critical strains and stresses at the moment of final failure. Numerical analyses were performed after careful calibration of the real stress – logarithmic strains uniaxial curves. Calibration followed modified Bai–Wierzbicki procedure.

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Are the mechanical field parameters sufficient to predict uniquely the failure due to the ductile or cleavage mechanisms?