An experimental campaign was developed to evaluate fatigue crack growth in Haynes 230. The effects of plasticity induced crack closure were investigated with Digital Image Correlation. In particular, crack opening levels were measured with the digital extensometer technique, which allowed the evaluation of crack flanks relative displacements. Experimental results were compared with a reference da/dn-ΔKeff curve and with the data of a previous study, which analyzed single crystal propagation. It was found that the adoption of crack closure local measurements provided an accurate estimation of crack propagation driving forces, since all the experimental points from single crystals and polycrystals collapse onto the da/dn-ΔKeff curve.

Fatigue crack propagation in haynes 230: A comparison between single and polycrystal crack closure levels

BERETTA, STEFANO;FOLETTI, STEFANO;RABBOLINI, SILVIO;
2016-01-01

Abstract

An experimental campaign was developed to evaluate fatigue crack growth in Haynes 230. The effects of plasticity induced crack closure were investigated with Digital Image Correlation. In particular, crack opening levels were measured with the digital extensometer technique, which allowed the evaluation of crack flanks relative displacements. Experimental results were compared with a reference da/dn-ΔKeff curve and with the data of a previous study, which analyzed single crystal propagation. It was found that the adoption of crack closure local measurements provided an accurate estimation of crack propagation driving forces, since all the experimental points from single crystals and polycrystals collapse onto the da/dn-ΔKeff curve.
Solid State Phenomena
9783038356264
Crack closure; Crack propagation; Fatigue; Stress intensity factor range; Superalloy; Atomic and Molecular Physics, and Optics; Materials Science (all); Condensed Matter Physics
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1018797
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