Abstract
This paper presents recent experimental investigations on the influence of loading rate on the fracture toughness K Ic for different structural steels. The loading rate in terms of increasing in stress intensity factor was changed from quasistatic up to dynamic conditions ( K ̇ I = 5 × 10 5 MNm − 3 2 s −1 ). The results show significant differences in the amount of temperature shift between K Ic - T curve obtained after static and dynamic loading for the materials investigated. Based on microscopic fracture criteria for cleavage fracture correlations were made between fracture toughness and yielding behaviour depending on temperature and strain rate. The experimental results were also compared with the predictions given by different models. The most promising results were achieved by a correlation between transition temperature shift in K Ic caused by dynamic loading and strain rate sensitivity m = ∂ ln σ/∂ ln ϵ ̇ of steels.
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