Fatigue crack growth was investigated in a line pipe steel. Severe straining conditions, like those experienced by pipelines, were considered during the experiments. Crack closure effects were investigated during the tests by adopting an innovative technique based on digital image correlation. Experimentally measured crack closure levels were implemented in a crack propagation model based on elastic-plastic fracture mechanics. A modified formulation of Delta J(eff), necessary to accurately describe crack propagation driving forces, is presented and employed to assess fatigue life in presence of high plastic strains.

Crack closure effects during low cycle fatigue propagation in line pipe steel: An analysis with digital image correlation

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

Abstract

Fatigue crack growth was investigated in a line pipe steel. Severe straining conditions, like those experienced by pipelines, were considered during the experiments. Crack closure effects were investigated during the tests by adopting an innovative technique based on digital image correlation. Experimentally measured crack closure levels were implemented in a crack propagation model based on elastic-plastic fracture mechanics. A modified formulation of Delta J(eff), necessary to accurately describe crack propagation driving forces, is presented and employed to assess fatigue life in presence of high plastic strains.
Crack propagation; Crack-closure; Digital image correlation; Effective J-Integral; Short cracks; Very low cycle fatigue; 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/11311/982653
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