Fracture and Structural Integrity e-ISSN 1971-8993 Open access
SI: Characterisation of Crack Tip Fields Vol. 13, No. 50 (2019)

Experimental characterisation of fatigue crack growth based on the CTOD measured from crack tip displacement fields using DIC

Author and affiliation details
  • José Manuel Vasco Olmo Corresponding author University of Jaén, Spain ORCID iD0000-0002-2250-2306 jvasco@ujaen.es
  • F.A. Díaz University of Jaén, Spain
  • F.V. Antunes University of Coimbra, Portugal
  • M.N. James University of Plymouth, UK
DOI
10.3221/IGF-ESIS.50.56
Published
Published inVol. 13, No. 50 (2019)Go to the issue

Abstract

The current work presents an experimental study on the use of the crack tip opening displacement (CTOD) to evaluate its ability to characterise fatigue crack growth. A methodology is developed to measure and to analyse the CTOD from experimental data. The vertical displacements obtained by implementing digital image correlation (DIC) on growing fatigue cracks are used to measure the CTOD. Two fatigue tests at stress ratios of 0.1 and 0.6 were conducted on compact tension (CT) specimens manufactured from a 1 mm thick sheet of commercially pure titanium. A sensitivity analysis to explore the effect of the position selected behind the crack tip for the CTOD measurement was performed. The analysis of a full loading cycle allowed identifying the elastic and plastic components of the CTOD. The plastic CTOD was found to be directly related to the nonlinear zone (i.e., plastic deformation) generated at the crack tip during fatigue propagation. Moreover, a linear relationship between da/dN and ΔCTODp independent of the stress ratio was found. Results show that the CTOD can be used as a viable alternative to the stress intensity factor range (ΔK) in characterising fatigue crack propagation since the parameter considers the fatigue threshold and crack shielding in an intrinsic way.

Keywords

Article history

  1. ReceivedUntil the next stage: 43 days
  2. AcceptedUntil the next stage: 149 days
  3. Published

How to cite

APA

Olmo, J. M. V., Díaz, F., Antunes, F., & James, M. (2019). Experimental characterisation of fatigue crack growth based on the CTOD measured from crack tip displacement fields using DIC. Fracture and Structural Integrity, 13(50). https://doi.org/10.3221/IGF-ESIS.50.56

IEEE

J. M. V. Olmo, F. Díaz, F. Antunes, and M. James, “Experimental characterisation of fatigue crack growth based on the CTOD measured from crack tip displacement fields using DIC,” Fracture and Structural Integrity, vol. 13, no. 50, 2019, doi: 10.3221/IGF-ESIS.50.56.

MLA

Olmo, José Manuel Vasco, et al. “Experimental characterisation of fatigue crack growth based on the CTOD measured from crack tip displacement fields using DIC.” Fracture and Structural Integrity, vol. 13, no. 50, 2019. https://doi.org/10.3221/IGF-ESIS.50.56.

Chicago

Olmo, José Manuel Vasco, F.A. Díaz, F.V. Antunes, and M.N. James. 2019. “Experimental characterisation of fatigue crack growth based on the CTOD measured from crack tip displacement fields using DIC.” Fracture and Structural Integrity 13 (50). https://doi.org/10.3221/IGF-ESIS.50.56.

Harvard

Olmo, J.M.V., Díaz, F., Antunes, F. and James, M. (2019) ‘Experimental characterisation of fatigue crack growth based on the CTOD measured from crack tip displacement fields using DIC’, Fracture and Structural Integrity, 13(50). doi: 10.3221/IGF-ESIS.50.56.

Vancouver

Olmo JMV, Díaz F, Antunes F, James M. Experimental characterisation of fatigue crack growth based on the CTOD measured from crack tip displacement fields using DIC. Fracture and Structural Integrity. 2019;13(50). doi:10.3221/IGF-ESIS.50.56

BibTeX

@article{olmo2019, author = {Olmo, José Manuel Vasco and Díaz, F.A. and Antunes, F.V. and James, M.N.}, title = {Experimental characterisation of fatigue crack growth based on the CTOD measured from crack tip displacement fields using DIC}, journal = {Fracture and Structural Integrity}, year = {2019}, volume = {13}, number = {50}, doi = {10.3221/IGF-ESIS.50.56}, url = {https://doi.org/10.3221/IGF-ESIS.50.56}, issn = {1971-8993} }

RIS

TY - JOUR AU - Olmo, José Manuel Vasco AU - Díaz, F.A. AU - Antunes, F.V. AU - James, M.N. TI - Experimental characterisation of fatigue crack growth based on the CTOD measured from crack tip displacement fields using DIC JO - Fracture and Structural Integrity T2 - Fracture and Structural Integrity PY - 2019 DA - 2019/09/19 VL - 13 IS - 50 DO - 10.3221/IGF-ESIS.50.56 UR - https://doi.org/10.3221/IGF-ESIS.50.56 SN - 1971-8993 ER -

Licence

Copyright © 2019 José Manuel Vasco Olmo, F.A. Díaz, F.V. Antunes, M.N. James.

Copyright 
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