In this work, a systematic investigation of three-dimensional (3D) T-stresses (T 11 and T 33 ) wasconducted using detailed elastic finite element analysis (FEA). The interaction integral method wasapplied to extract the T-stress solutions. Standard CCT specimens with a thickness-to-width ratio ofB/(2W) ≤ 0.0625 and a crack length-to-thickness ratio of 2a/B ≥ 8, as specified in ASTM E2472,were considered, and the cases of B/(2W) = 0.1 ~ 1.0 and 2a/B = 0.05 ~ 7 were also added. From theFEA results, it was found that both T 11 and T 33 at the specimen mid-plane showed significantchanges with crack lengths and specimen thicknesses for those CCT configurations that satisfyASTM E2472. Because both the in-plane and out-of-plane T-stresses were negative and showedlarge variations for all the considered CCT specimens which was true even for the CCT specimenscomplying with the ASTM E2472 standard, it was noted that these CCT specimens that complyingwith the standard might show the test specimen size effect (including the crack length and specimenthickness effect) on the fracture toughness if tested.
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