Void nucleation by inclusion cracking
Additional Document Info
Void nucleation is studied both experimentally and computationally with the aim of identifying a macroscopic criterion for nucleation by particle cracking. Three types of circumferentially notched cylindrical specimens made of a low-alloy steel were used, in order to vary the stress triaxiality in the notch region. The tensile tests were interrupted at various loads below the fracture load. The specimens were sectioned parallel to the loading axis, and the locations of cracked and uncracked titanium-nitride inclusions were identified. No evidence was found of void nucleation by inclusion debonding. Finite-element calculations were carried out for each specimen geometry using conventional isotropic-hardening plasticity theory. The ability of various potential void-nucleation criteria to predict the onset of void nucleation by inclusion cracking is explored.