scope:

ABSTRACT

True stress-strain curves up to final fracture (flow curves) are used for the assessment of materials behavior and determine the acceptability of Spent Nuclear Fuel (SNF) containers. To cover possible damage events like dropping of containers, several conditions must be considered. Different temperatures covering the effect of loads with high radioactivity and low ambient temperatures during loading and transport of such containers determine the required material properties. Austenitic steels like 304, 304L, 316, 316L show a tendency for strain-induced martensitic transformation at low temperatures which needs specific consideration. Strain rates are also important when dropping events are considered. In this report, true stress strain curves were determined in a true strain range from 0 to 100 percent. Up to Ultimate Tensile Strength (UTS), a Ramberg-Osgood type of analysis using strain at UTS was employed. Temperature dependence of UTS and yield stress (YS) was determined from experimental data and ASME Sect II Table D / Y-1 and U values. The stress-strain behavior at higher strains was determined on the basis of measured tangent moduli. Effects of strain rate were assessed with the Cowper-Symonds relation. A set of curves for temperatures ranging from -20°F to 600°F was developed.

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