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VERSION:2.0
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 12
SUMMARY:Stress-state dependent fracture properties of advanced high strength steels at cryogenic temperatures
DESCRIPTION:High-strength structural steels (from 960 MPa upwards) are becoming increasingly important in modern steel construction applications. These steel grades are particularly suitable for reducing sheet thicknesses of components and thus enabling more sustainable construction. The low-temperature properties are also of great importance, and a profound understanding is necessary in order to exclude the risk for catastrophic failure due to cleavage fracture in the component design. 
In this study, the low-temperature properties of a structural steel of type S960 were investigated. For this purpose, specimens of different stress states (including shear, plane strain and notched round bar) were  quasi-static tested in a bath of liquid nitrogen at -196°C. The resulting properties were analyzed in terms of ductility and strength and compared with the same properties at room temperature. For this purpose, a failure locus based on stress triaxiality and lode angle parameter and equivalent plastic strain was fitted to the data. In addition, the critical cleavage fracture stress of the material is identified. The probabilistic nature of the low-temperature properties was captured using a cumulative Weibull distribution so that a locus for different failure probabilities can be determined. The results show a pronounced dependence on the stress state, which is more pronounced at cryogenic temperatures than at room temperature.
In the last step, a comparison was made with a high strength a pipeline steel. Comparable tendencies were found at room temperature, but a clearly different behavior at low temperatures. This shows that the stress state dependence of the low-temperature failure properties is clearly material-dependent and large deviations can occur for different steel classes. 
These results can be used to calibrate damage mechanics simulation models, which can significantly accelerate efficient design of steel components for various applications.

CLASS:PUBLIC
DTSTART:20230614T092000
DTEND:20230614T094000
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