Elastic-plastic crack front fields in arc-shaped tension specimens (C-specimens) were analyzed by a three-dimensional finite element method. The effect of side grooves on the ductile fracture behavior was investigated by studying the J-integral distribution, plane-strain constraint parameter, and development of plastic zones and comparing to experimental data. The applicability of the η factor (derived for use with compact tension specimens) for the calculation of J-integral values for the C-specimen was also investigated. The results show that side grooves promote and establish near plane strain conditions at the crack front in sub-size specimens. It was also found that a two-dimensional plane-strain analysis in conjunction with the standard American Society for Testing and Materials (ASTM) tests was sufficient to determine the fracture toughness values from side-grooved C-specimen. The results indicate the η factor for compact tension specimen as specified in the ASTM standards appears to produce reliable results for the calculation of J of C-specimens.
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August 2004
Technical Papers
C-Specimen Fracture Toughness Testing: Effect of Side Grooves and η Factor
Y. Kim,
Y. Kim
Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208
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Y. J. Chao,
Y. J. Chao
Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208
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M. J. Pechersky,
M. J. Pechersky
Savannah River Technology Center, Savannah River Company, Aiken, SC 29808
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M. J. Morgan
M. J. Morgan
Savannah River Technology Center, Savannah River Company, Aiken, SC 29808
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Y. Kim
Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208
Y. J. Chao
Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208
M. J. Pechersky
Savannah River Technology Center, Savannah River Company, Aiken, SC 29808
M. J. Morgan
Savannah River Technology Center, Savannah River Company, Aiken, SC 29808
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division May 15, 2003; revision received June 17, 2003. Editor: S. Zamrik.
J. Pressure Vessel Technol. Aug 2004, 126(3): 293-299 (7 pages)
Published Online: August 18, 2004
Article history
Received:
May 15, 2003
Revised:
June 17, 2003
Online:
August 18, 2004
Citation
Kim , Y., Chao , Y. J., Pechersky , M. J., and Morgan , M. J. (August 18, 2004). "C-Specimen Fracture Toughness Testing: Effect of Side Grooves and η Factor ." ASME. J. Pressure Vessel Technol. August 2004; 126(3): 293–299. https://doi.org/10.1115/1.1762425
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