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Effects of fixture configurations and weld strength mismatch on J-integral calculation procedure for SE(B) specimens

(2022) MATERIALS. 15(3).
Author
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Abstract
This work presents the development of a J-integral estimation procedure for deep and shallow cracked bend specimens based upon plastic ηpl factors for a butt weld made in an S690 QL high strength low alloyed steel. Experimental procedures include the characterization of average material properties by tensile testing and evaluation of base and weld metal resistance to stable tearing by fracture testing of square SE(B) specimens containing a weld centerline notch. J-integral has been estimated from plastic work using a single specimen approach and the normalization data reduction technique. A comprehensive parametric finite element study has been conducted to calibrate plastic factor ηpl and geometry factor λ for various fixture and weld configurations, while a corresponding plastic factor γpl was computed on the basis of the former two. The modified ηpl and γpl factors were then incorporated in the J computation procedure given by the ASTM E1820 standard, for evaluation of the plastic component of J and its corresponding correction due to crack growth, respectively. Two kinds of J-R curves were computed on the basis of modified and standard ηpl and γpl factors, where the latter are given by ASTM E1820. A comparison of produced J-R curves for the base material revealed that variations in specimen fixtures can lead to ≈ 10% overestimation of computed fracture toughness JIc. Furthermore, a comparison of J-R curves for overmatched single-material idealized welds revealed that the application of standard ηpl and γpl factors can lead to the overestimation of computed fracture toughness JIc by more than 10%. Similar observations are made for undermatched single material idealized welds, where fracture toughness JIc is overestimated by ≈ 5%.
Keywords
metal weld, strength mismatch, fracture, plastic correction factors, fixture rollers, J-R resistance curve, ESTIMATION EQUATIONS, GIRTH WELDS, FRACTURE, CONSTRAINT, CURVES

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MLA
Stefane, Primoz, et al. “Effects of Fixture Configurations and Weld Strength Mismatch on J-Integral Calculation Procedure for SE(B) Specimens.” MATERIALS, vol. 15, no. 3, 2022, doi:10.3390/ma15030962.
APA
Stefane, P., Hertelé, S., Naib, S., De Waele, W., & Gubeljak, N. (2022). Effects of fixture configurations and weld strength mismatch on J-integral calculation procedure for SE(B) specimens. MATERIALS, 15(3). https://doi.org/10.3390/ma15030962
Chicago author-date
Stefane, Primoz, Stijn Hertelé, Sameera Naib, Wim De Waele, and Nenad Gubeljak. 2022. “Effects of Fixture Configurations and Weld Strength Mismatch on J-Integral Calculation Procedure for SE(B) Specimens.” MATERIALS 15 (3). https://doi.org/10.3390/ma15030962.
Chicago author-date (all authors)
Stefane, Primoz, Stijn Hertelé, Sameera Naib, Wim De Waele, and Nenad Gubeljak. 2022. “Effects of Fixture Configurations and Weld Strength Mismatch on J-Integral Calculation Procedure for SE(B) Specimens.” MATERIALS 15 (3). doi:10.3390/ma15030962.
Vancouver
1.
Stefane P, Hertelé S, Naib S, De Waele W, Gubeljak N. Effects of fixture configurations and weld strength mismatch on J-integral calculation procedure for SE(B) specimens. MATERIALS. 2022;15(3).
IEEE
[1]
P. Stefane, S. Hertelé, S. Naib, W. De Waele, and N. Gubeljak, “Effects of fixture configurations and weld strength mismatch on J-integral calculation procedure for SE(B) specimens,” MATERIALS, vol. 15, no. 3, 2022.
@article{8736662,
  abstract     = {{This work presents the development of a J-integral estimation procedure for deep and shallow cracked bend specimens based upon plastic ηpl factors for a butt weld made in an S690 QL high strength low alloyed steel. Experimental procedures include the characterization of average material properties by tensile testing and evaluation of base and weld metal resistance to stable tearing by fracture testing of square SE(B) specimens containing a weld centerline notch. J-integral has been estimated from plastic work using a single specimen approach and the normalization data reduction technique. A comprehensive parametric finite element study has been conducted to calibrate plastic factor ηpl and geometry factor λ for various fixture and weld configurations, while a corresponding plastic factor γpl was computed on the basis of the former two. The modified ηpl and γpl factors were then incorporated in the J computation procedure given by the ASTM E1820 standard, for evaluation of the plastic component of J and its corresponding correction due to crack growth, respectively. Two kinds of J-R curves were computed on the basis of modified and standard ηpl and γpl factors, where the latter are given by ASTM E1820. A comparison of produced J-R curves for the base material revealed that variations in specimen fixtures can lead to ≈ 10% overestimation of computed fracture toughness JIc. Furthermore, a comparison of J-R curves for overmatched single-material idealized welds revealed that the application of standard ηpl and γpl factors can lead to the overestimation of computed fracture toughness JIc by more than 10%. Similar observations are made for undermatched single material idealized welds, where fracture toughness JIc is overestimated
by ≈ 5%.}},
  articleno    = {{962}},
  author       = {{Stefane, Primoz and Hertelé, Stijn and Naib, Sameera and De Waele, Wim and Gubeljak, Nenad}},
  issn         = {{1996-1944}},
  journal      = {{MATERIALS}},
  keywords     = {{metal weld,strength mismatch,fracture,plastic correction factors,fixture rollers,J-R resistance curve,ESTIMATION EQUATIONS,GIRTH WELDS,FRACTURE,CONSTRAINT,CURVES}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{26}},
  title        = {{Effects of fixture configurations and weld strength mismatch on J-integral calculation procedure for SE(B) specimens}},
  url          = {{http://dx.doi.org/10.3390/ma15030962}},
  volume       = {{15}},
  year         = {{2022}},
}

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