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.
DOI
10.1111/ffe.13681
Publication Date
2022-05-01
Publication Title
Fatigue and Fracture of Engineering Materials and Structures
Volume
45
Issue
5
ISSN
8756-758X
Embargo Period
2022-05-06
Organisational Unit
School of Engineering, Computing and Mathematics
First Page
1494
Last Page
1504
Recommended Citation
Vasco‐Olmo, J., Díaz, F., Camacho‐Reyes, A., James, N., & Antunes, F. (2022) 'Experimental evaluation of plastic wake on growing fatigue cracks from the analysis of residual displacement fields', Fatigue and Fracture of Engineering Materials and Structures, 45(5), pp. 1494-1504. Available at: https://doi.org/10.1111/ffe.13681
