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Elastic-plastic crack front fields in are-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 [eta] 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 [eta] factor for compact tension specimen as specified in the ASTM standards appears to produce reliable results for the calculation of J of C-specimens. [DOI: 10.1115/1.1762425] Keywords: Arc-Shaped Tension Specimen, Elastic-Plastic Fracture, Three Dimensional, Crack-Front Field, Finite Element Method, Side-Groove, [eta] Factor