The paper discusses the basic issues of local approach to ductile fracture structural metals, with particular emphasis on failure due microvoid development. mechanisms nucleation voids around inclusions and precipitates are characterized. criteria for resulting from cracking existing particles or their separation material matrix presented. Selected results experimental studies Finite Element Me...

A reliable determination of the onset void coalescence is critical to modelling ductile fracture. Numerical models have been developed but rely mostly on analyses single defect cells, thus underestimating interaction between voids. This study aims provide first extensive analysis response microstructures with random distributions voids various loading conditions and characterize dispersion resu...

In 2003, researchers at Toyota introduced a TiNb based alloy that they named Gum Metal. The alloy displays super strength, super elasticity and considerable ductility. In fact the alloy's observed strength approaches the its ideal strength. These properties fully emerge only after extensive cold swaging. However, postdeformation microstructures reveal few (if any) dislocations. These observatio...

Much attention has been devoted to predicting and controlling fracture toughness in ferrous weldments. Extensive studies relat ing toughness with welding parameters and weldment composit ion have been made. All such studies have sought to define the important variables affecting toughness. Unfortunately, such studies often resulted in linear regressions of one variable against toughness, fractu...

We have performed massively parallel 3D molecular dynamics simulations with up to 35 million atoms to investigate ductile fracture. We have obtained mechanistic information at the atomistic level inaccessible to experiment. We observe dislocation loops emitted from the crack front|the rst time this has been seen in computer simulations. The sequence of dislocation emission (crack blunting proce...

In this paper, the fracture behavior of ML15 cold heading steel was investigated based on ductile theory. Smooth and notched bar, flat grooved tensile–shear mixed plate specimens were designed, tensile tests carried out to examine mechanism ML15. The micromechanical characteristics surfaces different studied by performing scanning electron microscopy. results showed that under stress states mic...