The Beremin model can handle both of plastic constraint effect and data scatter for brittle fracture. Many researchers have been investigating its applicability for more than 30 years and still discussing about temperature dependence of Weibull parameters of this model. The authors have already presented the experimental and analytical investigation results for low alloy steel using CT specimens in several temperature conditions. The analysis suggested that the Weibull parameters are constant for temperature. In this paper fracture toughness tests of carbon steel using SENB specimens at -120°C and -50°C were performed and the Weibull parameters were determined by the test result at -120°C. *K*~Jc~ of the 5% lower bound and the 95% upper bound confidence limit at -50°C were predicted using the Weibull parameters from -120°C. As a result, the predicted 5% lower bound confidence limit is close to the lowest experimental *K*~Jc~ whose fracture mode was nearly cleavage fracture. This means there is no temperature dependency of the Weibull parameters and the similar results as low alloy steel. On the other hand the predicted 95% upper bound confidence limit has a large gap comparing with the experimental upper *K*~Jc~. The specimens of larger *K*~Jc~ developed ductile crack growth of several millimeters, which needs a correction of stress-strain field. 


Investigation of Temperature Dependence of Weibull Parameters of the Beremin Model in Ductile-Brittle Transition Temperature Region

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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