Influence of Loading Rate on the Fracture Toughness of Some Structural Steels in the Transition Regime

TL;DRAbstract

The fracture toughness of five structural steels was determined as a function of temperature in static and dynamic conditions (˙K ≈ 2 × 104 MPa √m/s). The most significant effect of increasing the strain rate was to shift the KIc-temperature curve towards higher temperatures. The amplitude of the temperature shift between the transition temperatures obtained in static (TKIc) and dynamic (TKId) conditions were compared with the predictions given by different models. It appeared that the variations of yield strength cannot always account for the change of fracture toughness with temperature and strain rate. A correlation between Charpy V-notch (CVN) transition temperature (TK 28) and dynamic toughness transition temperature (TKId) was established. This correlation is an extension of the one proposed previously between TK 28 and TKIc. Assuming that fracture toughness transition is a thermally activated process, it was possible to calculate theoretically the slopes of the correlations; the

Chat with Paper

AI Agents for this Paper