In this work a novel methodology for fracture toughness characterization bymeans of the small punch test (SPT) is presented. Notched specimens areemployed and fracture resistance is assessed through a critical value of thenotch mouth displacement {\delta^SPT}. Finite element simulations andinterrupted experiments are used to track the evolution of {\delta^SPT} as afunction of the punch displacement. The onset of crack propagation isidentified by means of a ductile damage model and the outcome is compared tothe crack tip opening displacement estimated from conventional tests at crackinitiation. The proposed numerical-experimental scheme is examined with twodifferent grades of CrMoV steel and the differences in material toughnesscaptured. Limitations and uncertainties arising from the different damagephenomena observed in the lowest toughness material examined are thoroughlydiscussed.
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