Prediction of cleavage fracture in ferritic steels by small punch tests with a modified Weibull stress model

In this paper, conventional small punch (SP) tests are carried out to determine the SP ductile-to-brittle transition temperature, TSP. The center holed small punch (CHSP) specimens are tested at TSP to determine the Weibull parameters with two different Weibull stress model. The relationship between temperature and the Weibull stress scale parameter, σu, is investigated. The result showed that a unique set of Weibull parameters for CHSP specimens and 0.4T SENB specimens is available by using the modified model not the original model. And the Weibull stress scale parameter, σu, is a power function of temperature.