Prediction of void growth in tensile test

An exponential ductile continuum damage model for metals

“…1. The plot shows good agreement with the experimental results given in [3] and [4]. From the graph it is evident that the damage growth is very slow initially with first population of voids.…”

“…Le Roy et al [3] and Dung [4] have conducted experimental investigations on four different types of spheroidized carbon steels. They have conducted tension tests to study the void nucleation, growth and coalescence of voids.…”

“…This phenomenon is evident from the presence of dimples or depressions on a fractured surface of ductile materials. When the void length reaches some multiple of its distance (spacing) from a neighboring void [3,4], this results in ductile fracture. These inclusions could be second phase particles which are added to the matrix to induce specific properties like increasing yield strength or the presence of other impurities like slags.…”

“…Void nucleation generally occurs due to brittle cracking or shattering or inter-facial debonding of inclusions. For better understanding of ductile fracture, pioneering work has been carried out by McClintock [5], Rice and Tracey [2] Le Roy et al [3] and Dung [4]. For example a void nucleates due to AlzO3 particles in 6061 A1 composites [1] at small strains.…”

A note on calibration of ductile failure damage indicators

“…Magnusen [35]. Dung [36][37][38] especially applied the micromechanical model for an array of parallel ellipsoids to define a damage indicator, different however from (8), considering the coalescence of the ellipsoids. Since often neither the actual shape of a precipitation (void) nor its distance to neighbouring voids is known, the simplified version due to Hancock and Mackenzie [27] seems to be justified.…”