Experimental evaluation of plastic wake on growing fatigue cracks from the analysis of residual displacement fields

JM Vasco‐Olmo, Francisco A. Díaz, A Camacho‐Reyes, Neil James, Fernando V. Antunes

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Abstract

A growing fatigue crack gives rise to a plastically deformed wake of material that envelops the crack. In this work, the plastic wake extent during fatigue crack growth is experimentally quantified by analyzing the crack tip displacement fields measured with digital image correlation. A novel technique based on use of a yield criterion is proposed that uses the undamaged state of the specimen as the reference state in the image processing. The plastic wake was identified by differentiation of the residual displacement fields obtained with a near-zero load level to avoid any rigid body motion. The plastic wake extent was then found by assuming that the boundary between the elastic and plastic regions would occur when the equivalent stress was higher than the yield stress of the material. The results presented can contribute to a better understanding of the mechanisms driving fatigue crack propagation.
Original languageEnglish
Pages (from-to)1494-1504
Number of pages0
JournalFatigue and Fracture of Engineering Materials and Structures
Volume45
Issue number5
Early online date19 Feb 2022
DOIs
Publication statusPublished - May 2022

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