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About the applicability of the Small Punch test to the characterization of the 1CrMoV aged steel: mechanical experimental tests and numerical analyses

pubblicazioni - Articolo

About the applicability of the Small Punch test to the characterization of the 1CrMoV aged steel: mechanical experimental tests and numerical analyses

Le proprietà tensili dell’acciaio 1CrMoV, sono state caratterizzate sia con prove meccaniche tradizionali standard sia con prove meccaniche miniaturizzate Small Punch. Le prove sono state eseguite sia su materiale nuovo sia su materiale, di diverso fornitore, invecchiato in esercizio. In entrambi i casi sono state eseguite anche simulazioni numeriche, sia in analisi diretta sia in analisi inversa, basate su modelli F.E.M. I risultati sono messi a confronto e la non unicità della soluzione matematica trovata nell’analisi inversa é discussa.

The life extension of a component in service is of great importance in many engineering applications and it relies on the possibility of monitoring the degradation of its material following in-service loading. In this view, non-destructive testing is needed in order to be able to keep the component in service by evaluating the material properties substantially on line. The present work focuses on a miniature mechanical test named “small punch test”, which has been employed on virgin and aged 1CrMoV steel in order to characterise its mechanical behaviour. A thorough experimental analysis has been carried out using classical and miniature mechanical tests and the results have been compared in order to evaluate the feasibility of the small punch test aimed at the characterisation of an aged steel. A numerical framework based on finite element simulations is also presented to support the findings of the experimental tests. Starting from the simulation of a typical load-displacement curve given by the small punch test, the elastic-plastic parameters have been identified and applied in the simulation of the tensile tests. Experimental results and non-uniqueness of the mathematical solution associated to the identification of the material parameters are discussed.

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