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

2022-02-12

Publication Title

Fatigue and Fracture of Engineering Materials and Structures

Volume

45

Issue

5

First Page

1494

Last Page

1504

ISSN

8756-758X

Embargo Period

2022-05-06

Organisational Unit

School of Engineering, Computing and Mathematics

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