Fracture and Structural Integrity e-ISSN 1971-8993 Open access
Miscellanea Vol. 10, No. 38 (2016)

Comparison between SSF and Critical-Plane models to predict fatigue lives under multiaxial proportional load histories

Author and affiliation details
  • Manuel de Freitas Corresponding author mfreitas@dem.ist.utl.pt
  • Luis Reis
  • Marco Antonio Meggiolaro
  • Jaime Tupiassú Pinho de Castro
DOI
10.3221/IGF-ESIS.38.16
Pages
Pages 121-127
Published
Published inVol. 10, No. 38 (2016)Go to the issue

Abstract

Materials can be classified as shear or tensile sensitive, depending on the main fatigue microcrack initiation process under multiaxial loadings. The nature of the initiating microcrack can be evaluated from a stress scale factor (SSF), which usually multiplies the hydrostatic or the normal stress term from the adopted multiaxial fatigue damage parameter. Low SSF values are associated with a shear-sensitive material, while a large SSF indicates that a tensile-based multiaxial fatigue damage model should be used instead. For tension-torsion histories, a recent published approach combines the shear and normal stress amplitudes using a SSF polynomial function that depends on the stress amplitude ratio (SAR) between the shear and the normal components. Alternatively, critical-plane models calculate damage on the plane where damage is maximized, adopting a SSF value that is assumed constant for a given material, sometimes varying with the fatigue life (in cycles), but not with the SAR, the stress amplitude level, or the loading path shape. In this work, in-phase proportional tension-torsion tests in 42CrMo4 steel specimens for several values of the SAR are presented. The SSF approach is then compared with critical-plane models, based on their predicted fatigue lives and the observed values for these tension-torsion histories. KEYWORDS. Multiaxial fatigue life prediction; Critical-plane approach; Polynomial stress scale factor approach.

Keywords

Article history

  1. ReceivedUntil the next stage: 0 days
  2. AcceptedUntil the next stage: 3 days
  3. Published

How to cite

APA

de Freitas, M., Reis, L., Meggiolaro, M. A., & Tupiassú Pinho de Castro, J. (2016). Comparison between SSF and Critical-Plane models to predict fatigue lives under multiaxial proportional load histories. Fracture and Structural Integrity, 10(38), Pages 121–127. https://doi.org/10.3221/IGF-ESIS.38.16

IEEE

M. de Freitas, L. Reis, M. A. Meggiolaro, and J. Tupiassú Pinho de Castro, “Comparison between SSF and Critical-Plane models to predict fatigue lives under multiaxial proportional load histories,” Fracture and Structural Integrity, vol. 10, no. 38, pp. Pages 121–127, 2016, doi: 10.3221/IGF-ESIS.38.16.

MLA

de Freitas, Manuel, et al. “Comparison between SSF and Critical-Plane models to predict fatigue lives under multiaxial proportional load histories.” Fracture and Structural Integrity, vol. 10, no. 38, 2016, pp. Pages 121–127. https://doi.org/10.3221/IGF-ESIS.38.16.

Chicago

de Freitas, Manuel, Luis Reis, Marco Antonio Meggiolaro, and Jaime Tupiassú Pinho de Castro. 2016. “Comparison between SSF and Critical-Plane models to predict fatigue lives under multiaxial proportional load histories.” Fracture and Structural Integrity 10 (38): Pages 121–127. https://doi.org/10.3221/IGF-ESIS.38.16.

Harvard

de Freitas, M., Reis, L., Meggiolaro, M.A. and Tupiassú Pinho de Castro, J. (2016) ‘Comparison between SSF and Critical-Plane models to predict fatigue lives under multiaxial proportional load histories’, Fracture and Structural Integrity, 10(38), pp. Pages 121–127. doi: 10.3221/IGF-ESIS.38.16.

Vancouver

de Freitas M, Reis L, Meggiolaro MA, Tupiassú Pinho de Castro J. Comparison between SSF and Critical-Plane models to predict fatigue lives under multiaxial proportional load histories. Fracture and Structural Integrity. 2016;10(38):Pages 121-127. doi:10.3221/IGF-ESIS.38.16

BibTeX

@article{defreitas2016, author = {de Freitas, Manuel and Reis, Luis and Meggiolaro, Marco Antonio and Tupiassú Pinho de Castro, Jaime}, title = {Comparison between SSF and Critical-Plane models to predict fatigue lives under multiaxial proportional load histories}, journal = {Fracture and Structural Integrity}, year = {2016}, volume = {10}, number = {38}, pages = {Pages 121--127}, doi = {10.3221/IGF-ESIS.38.16}, url = {https://doi.org/10.3221/IGF-ESIS.38.16}, issn = {1971-8993} }

RIS

TY - JOUR AU - de Freitas, Manuel AU - Reis, Luis AU - Meggiolaro, Marco Antonio AU - Tupiassú Pinho de Castro, Jaime TI - Comparison between SSF and Critical-Plane models to predict fatigue lives under multiaxial proportional load histories JO - Fracture and Structural Integrity T2 - Fracture and Structural Integrity PY - 2016 DA - 2016/10/03 VL - 10 IS - 38 SP - Pages 121 EP - 127 DO - 10.3221/IGF-ESIS.38.16 UR - https://doi.org/10.3221/IGF-ESIS.38.16 SN - 1971-8993 ER -

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