Fatigue crack growth was investigated in Haynes 230, a nickel-based superalloy. Aniso- tropic stress intensity factors were calculated with a least squares algorithm using the dis- placements obtained from digital image correlation. Crack opening/sliding levels were measured by analysing the relative displacement of crack flanks. Reversed crack tip plastic zones were calculated adopting an anisotropic yield criterion. The strains measured in the reversed plastic zone by digital image correlation showed a dependence on crystallo- graphic orientation. Finally, a finite element model was adopted to examine plasticity around the crack tip. Results were compared with the experimentally observed strains.

Fatigue crack growth in Haynes 230 single crystals: An analysis with digital image correlation

RABBOLINI, SILVIO;BERETTA, STEFANO
2015-01-01

Abstract

Fatigue crack growth was investigated in Haynes 230, a nickel-based superalloy. Aniso- tropic stress intensity factors were calculated with a least squares algorithm using the dis- placements obtained from digital image correlation. Crack opening/sliding levels were measured by analysing the relative displacement of crack flanks. Reversed crack tip plastic zones were calculated adopting an anisotropic yield criterion. The strains measured in the reversed plastic zone by digital image correlation showed a dependence on crystallo- graphic orientation. Finally, a finite element model was adopted to examine plasticity around the crack tip. Results were compared with the experimentally observed strains.
effective stress intensity factor range; fatigue crack growth; mixed-mode propagation; plastic zone; single crystal nickel-based alloy; single crystal plasticity; Mechanical Engineering; Mechanics of Materials; Materials Science (all)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/983393
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