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Application of the small punch test to determine the fracture toughness of metallic materials
Author(s) -
CÁRDENAS E.,
BELZUNCE F. J.,
RODRÍGUEZ C.,
PEÑUELAS I.,
BETEGÓN C.
Publication year - 2012
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2011.01635.x
Subject(s) - materials science , fracture toughness , j integral , composite material , displacement (psychology) , fracture (geology) , structural engineering , scanning electron microscope , finite element method , engineering , psychology , psychotherapist
A new methodology to determine the elasto‐plastic fracture toughness, J Ic , by means of notched small punch tests (SPT) samples is reported. Standard SPT samples were used after being longitudinally notched machined from the centre of one side of the sample to the centre of the opposite side, producing a notch depth‐to‐thickness ratio a / t = 0.4. The onset of crack initiation was experimentally determined directly from the experimental load‐displacement plot of the test and also with the aid of scanning electron microscope observations performed on different samples, with tests being interrupted at different percentages of the maximum registered load. The test was also modelled using finite element analysis and the J‐integral was evaluated as a contour integral in ABAQUS. The obtained results were compared with the critical J values of the steel determined using standard tests (J–R curves) and the differences found were duly justified.