Fracture and Structural Integrity e-ISSN 1971-8993 Open access
SI: Characterisation of Crack Tip Fields Vol. 13, No. 49 (2019)

Verification of the ΔKeff hypothesis along the fatigue crack path in thin and thick Al specimens

Author and affiliation details
  • Julián Andrés Ortiz González Corresponding author Pontifical Catholic University of Rio de Janeiro, PUC-Rio. julian@aluno.puc-rio.br
  • Jaime Tupiassú Pinho de Castro Pontifical Catholic University of Rio de Janeiro, PUC-Rio.
  • Giancarlo Luis Gomez Gonzáles Pontifical Catholic University of Rio de Janeiro, PUC-Rio.
  • Marco Antonio Meggiolaro Pontifical Catholic University of Rio de Janeiro, PUC-Rio.
  • José Luiz de França Freire
DOI
10.3221/IGF-ESIS.49.03
Pages
26-35
Published
Published inVol. 13, No. 49 (2019)Go to the issue

Abstract

Elber assumed that the actual driving force for fatigue crack growth (FCG) is the effective stress intensity factor ΔKeff. To verify this hypothesis, both DC(T) and C(T) specimens are cut from a 6351-T6 Al alloy circular bar with two different thicknesses, 2 and 30mm, tested under fixed ΔK and Kmax to simulated plane stress and plane strain FCG conditions. A strain-gage bonded on the back face of the specimens is used to measure the crack length and a custom-made Labview program is used to control the applied load, maintaining ΔK and Kmax constant along the crack path. Moreover, the crack opening load is redundantly measured during the FCG tests, using far field strains from the back face gage and near field strains from a series of gages bonded along the crack path, as well as an independent digital image correlation system to measure displacement/strain fields on the face of the specimens. These tests show that the Al specimens reproduce the behavior previously observed in similar tests in 1020 steel: a significant decrease of the opening load as the cracks grow along the specimens, while maintaining a FCG rate essentially constant under the fixed {ΔK, Kmax} loading, a behavior that cannot be explained by the ΔKeff hypothesis.

Keywords

Article history

  1. ReceivedUntil the next stage: 57 days
  2. AcceptedUntil the next stage: 31 days
  3. Published

How to cite

APA

González, J. A. O., de Castro, J. T. P., Gonzáles, G. L. G., Meggiolaro, M. A., & Freire, J. L. D. F. (2019). Verification of the ΔKeff hypothesis along the fatigue crack path in thin and thick Al specimens. Fracture and Structural Integrity, 13(49), 26–35. https://doi.org/10.3221/IGF-ESIS.49.03

IEEE

J. A. O. González, J. T. P. de Castro, G. L. G. Gonzáles, M. A. Meggiolaro, and J. L. D. F. Freire, “Verification of the ΔKeff hypothesis along the fatigue crack path in thin and thick Al specimens,” Fracture and Structural Integrity, vol. 13, no. 49, pp. 26–35, 2019, doi: 10.3221/IGF-ESIS.49.03.

MLA

González, Julián Andrés Ortiz, et al. “Verification of the ΔKeff hypothesis along the fatigue crack path in thin and thick Al specimens.” Fracture and Structural Integrity, vol. 13, no. 49, 2019, pp. 26–35. https://doi.org/10.3221/IGF-ESIS.49.03.

Chicago

González, Julián Andrés Ortiz, Jaime Tupiassú Pinho de Castro, Giancarlo Luis Gomez Gonzáles, Marco Antonio Meggiolaro, and José Luiz de França Freire. 2019. “Verification of the ΔKeff hypothesis along the fatigue crack path in thin and thick Al specimens.” Fracture and Structural Integrity 13 (49): 26–35. https://doi.org/10.3221/IGF-ESIS.49.03.

Harvard

González, J.A.O., de Castro, J.T.P., Gonzáles, G.L.G., Meggiolaro, M.A. and Freire, J.L.D.F. (2019) ‘Verification of the ΔKeff hypothesis along the fatigue crack path in thin and thick Al specimens’, Fracture and Structural Integrity, 13(49), pp. 26–35. doi: 10.3221/IGF-ESIS.49.03.

Vancouver

González JAO, de Castro JTP, Gonzáles GLG, Meggiolaro MA, Freire JLDF. Verification of the ΔKeff hypothesis along the fatigue crack path in thin and thick Al specimens. Fracture and Structural Integrity. 2019;13(49):26-35. doi:10.3221/IGF-ESIS.49.03

BibTeX

@article{gonzalez2019, author = {González, Julián Andrés Ortiz and de Castro, Jaime Tupiassú Pinho and Gonzáles, Giancarlo Luis Gomez and Meggiolaro, Marco Antonio and Freire, José Luiz de França}, title = {Verification of the ΔKeff hypothesis along the fatigue crack path in thin and thick Al specimens}, journal = {Fracture and Structural Integrity}, year = {2019}, volume = {13}, number = {49}, pages = {26--35}, doi = {10.3221/IGF-ESIS.49.03}, url = {https://doi.org/10.3221/IGF-ESIS.49.03}, issn = {1971-8993} }

RIS

TY - JOUR AU - González, Julián Andrés Ortiz AU - de Castro, Jaime Tupiassú Pinho AU - Gonzáles, Giancarlo Luis Gomez AU - Meggiolaro, Marco Antonio AU - Freire, José Luiz de França TI - Verification of the ΔKeff hypothesis along the fatigue crack path in thin and thick Al specimens JO - Fracture and Structural Integrity T2 - Fracture and Structural Integrity PY - 2019 DA - 2019/05/24 VL - 13 IS - 49 SP - 26 EP - 35 DO - 10.3221/IGF-ESIS.49.03 UR - https://doi.org/10.3221/IGF-ESIS.49.03 SN - 1971-8993 ER -

Licence

Copyright © 2019 Julián Andrés Ortiz González, Jaime Tupiassú Pinho de Castro, Giancarlo Luis Gomez Gonzáles, Marco Antonio Meggiolaro, José Luiz de França Freire.

Copyright 
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