In this paper a set of specimens, used for the critical distance determination, are investigated with a non-contact 3D optical profiler. The fatigue fracture surfaces of both plain and V-notched specimens, under axial (mode I) and torsional (mode III) loadings are observed, investigating steel 42CrMo4+QT and aluminium alloy 7075-T6. The fatigue fracture profiles are compared to be previously obtained critical distances, both for mode I and mode III. The stage I to stage II transition was found at a smaller size than the axial critical distance, for the steel, while for the torsional load a local plateau at the nucleation was observed. The fracture surface of the axial loading was instead much irregular at the scale of the mode I critical distance, for the aluminium alloy, resembling a not concluded stage I, while again a relatively flat surface was observed for the mode III loading.

Fatigue fracture surface investigations with a 3D optical profiler / Santus, C.; Neri, P.; Romoli, L.; Lutey, A.; Raghavendra, S.; Benedetti, M.. - In: PROCEDIA STRUCTURAL INTEGRITY. - ISSN 2452-3216. - ELETTRONICO. - 39:(2022), pp. 450-459. [10.1016/j.prostr.2022.03.114]

Fatigue fracture surface investigations with a 3D optical profiler

Raghavendra, S.;Benedetti, M.
2022

Abstract

In this paper a set of specimens, used for the critical distance determination, are investigated with a non-contact 3D optical profiler. The fatigue fracture surfaces of both plain and V-notched specimens, under axial (mode I) and torsional (mode III) loadings are observed, investigating steel 42CrMo4+QT and aluminium alloy 7075-T6. The fatigue fracture profiles are compared to be previously obtained critical distances, both for mode I and mode III. The stage I to stage II transition was found at a smaller size than the axial critical distance, for the steel, while for the torsional load a local plateau at the nucleation was observed. The fracture surface of the axial loading was instead much irregular at the scale of the mode I critical distance, for the aluminium alloy, resembling a not concluded stage I, while again a relatively flat surface was observed for the mode III loading.
Santus, C.; Neri, P.; Romoli, L.; Lutey, A.; Raghavendra, S.; Benedetti, M.
Fatigue fracture surface investigations with a 3D optical profiler / Santus, C.; Neri, P.; Romoli, L.; Lutey, A.; Raghavendra, S.; Benedetti, M.. - In: PROCEDIA STRUCTURAL INTEGRITY. - ISSN 2452-3216. - ELETTRONICO. - 39:(2022), pp. 450-459. [10.1016/j.prostr.2022.03.114]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/337718
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