Abstract
Four groups of specimens of mild steels were tested in plain-tension and four-point notch bending over a range of temperatures from -196°C to 200°C. Finite element method (FEM) was used to calculate the stress field of notched bar. Experimental results were analysed with a combined viewpoint of mechanics-metallurgy, Probabilistic demand is emphasized in notch bend tests and a concept of “effective yield zone” is proposed. Based on this concept, expression for cleavage criterion and that for brittle-to-ductile transition condition in notch bending were derived and verified by test results. It is indicated that for mild steels there exists an important parameter — cleavage characteristic stress SCo which controls the cleavage behavior in both plain-tension and notch bend tests.
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