| Popis: |
A nucleation-controlled model for the dynamic fracture-toughness KId of materials, with relatively high volume-fractions of sub-micron sized second-phase particles, is developed from the Goods and Brown model of microvoid nucleation. The model can be used to investigate the effects of variations in temperature, strain-rate and fluid-hydrostatic pressure on dynamic fracture-toughness, for various forms of relationship between the critical particle/matrix decohesion stress and the test temperature. Preliminary KId and KIC results for a medium-carbon steel show a good general agreement with experimental results. |
