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.
C-Specimen Fracture Toughness Testing: Effect of Side Grooves and η Factor
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.
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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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