Small Punch (SP) test is one of the miniature test methods, which is a quasi-destructive testing method that evaluates the mechanical properties from limited volumes of materials. Structural materials in nuclear power plants experience degradation in the neutron irradiation environment during the operation, and this aging is assessed by measuring the Charpy index temperature shift of materials at 41J (T~41J~). However, there are many difficulties in deriving T~41J~ or the fracture toughness from the SP test due to the difference in the failure mode between the SP tests (compression) and the conventional Charpy impact and fracture toughness tests (tension). In this study, a method to predict the index temperature at 41J by using the key parameters obtained from SP load-displacement curve was proposed. T~41J~ prediction methods using the plastic strain energy and displacement after the maximum load in SP test were proposed, and an analysis of the correlation between the key parameters of SP test and the fracture toughness values was performed. As a result of applying the plastic strain energy parameter of SP curve, it showed better prediction than the total fracture energy parameter, and in case of displacement after the maximum load parameter, the results was consistent with the microstructure of the fracture surface.


Estimation of Charpy Index Temperature of Sa 508 Mn-Mo-Ni Low Alloy Steels at 41j Using Small Punch Tests

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


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

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