Publication detail

Estimation of the Plastic Zone in Fatigue via Micro-Indentation

Lopez-Crespo, C., Cruces A., Seitl, S., Moreno, B., Lopez-Crespo, P.

Original Title

Estimation of the Plastic Zone in Fatigue via Micro-Indentation

Type

journal article in Web of Science

Language

English

Original Abstract

Accurate knowledge of the plastic zone of fatigue cracks is a very direct and effective way to quantify the damage of components subjected to cyclic loads. In this work, we propose an ultra-fine experimental characterisation of the plastic zone based on Vickers micro-indentations. The methodology is applied to different compact tension (CT) specimens made of aluminium alloy 2024-T351 subjected to increasing stress intensity factors. The experimental work and sensitivity analysis showed that polishing the surface to #3 mu m surface finish and applying a 25 g-force load for 15 s produced the best results in terms of resolution and quality of the data. The methodology allowed the size and shape of both the cyclic and the monotonic plastic zones to be visualised through 2D contour maps. Comparison with Westergaard's analytical model indicates that the methodology, in general, overestimates the plastic zone. Comparison with S355 low carbon steel suggests that the methodology works best for alloys exhibiting a high strain hardening ratio.

Keywords

plastic zone in fatigue cracks; fatigue of materials; micro-indentation

Authors

Lopez-Crespo, C., Cruces A., Seitl, S., Moreno, B., Lopez-Crespo, P.

Released

8. 10. 2021

Publisher

MDPI

Location

BASEL

ISBN

1996-1944

Periodical

Materials

Year of study

14

Number

19

State

Swiss Confederation

Pages from

1

Pages to

14

Pages count

14

URL

https://www.mdpi.com/1996-1944/14/19/5885

Full text in the Digital Library

http://hdl.handle.net/11012/204034

BibTex

@article{BUT176283,
  author="Cristina {Lopez-Crespo} and Alejandro {Cruces} and Stanislav {Seitl} and MARIA BELEN {MORENO MORALES} and Pablo {Lopéz-Crespo}",
  title="Estimation of the Plastic Zone in Fatigue via Micro-Indentation",
  journal="Materials",
  year="2021",
  volume="14",
  number="19",
  pages="1--14",
  doi="10.3390/ma14195885",
  issn="1996-1944",
  url="https://www.mdpi.com/1996-1944/14/19/5885"
}