Sociedad Española de Integridad Estructural
Grupo Español de Fractura

Sociedad Española de Integridad Estructural
Grupo Español de Fractura

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QUANTIFYING THE EFFECTS OF PLASTICITY ON CRACK STRESS FIELDS

E. A. Patterson        

Anales de la Mecánica de la Fractura, nº 27 . 2010 . Pág. -
Ver (.pdf): 132

Resumen: The presence of plastic zones at the tip and along the flanks of cracks has been recognized for a long time, however there has been controversy about their influence on crack propagation because of the difficulty in quantifying their impact on the stress/strain fields around the crack. In the last decade, there have been substantial advances in full-field measurement techniques which have allowed strains around a propagating crack to be monitored. An overview of three such techniques is provided and illustrated through their use in both fundamental studies and applications in the aerospace industry. Post-processing algorithms have been developed to compute stress intensity factors from displacement data obtained from digital image correlation using the surface texture of the material around the crack tip which offers the potential to monitor behavior in engineering components. A similar approach has been taken with thermoelastic stress analysis, however in recent experiments the phase difference between the applied load cycle and local temperature changes has been used to quantitatively identify the size and shape of the plastic zone at the crack tip. This novel approach has been used to study the interaction of the crack tip with the plastic zone during overload events. Photoelasticity has been used for sometime to evaluate stress intensity factors however in recent work it has been used to qualitatively examine the mechanisms associated with plasticity-induced shielding of crack tips, and to develop a new model that allows the associated forces to be characterized quantitatively. Together, these techniques from experimental mechanics allow a deeper understanding to be obtained of crack propagation mechanisms in complex applications such as the fracture of wing-skin panels and fatigue failure from cold-worked holes.

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Department of Mechanical Engineering, Michigan State University, 2555 Engineering Building, East Lansing, USA.






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