Issue 33

G.P. Nikishkov et alii, Frattura ed Integrità Strutturale, 33 (2015) 73-79; DOI: 10.3221/IGF-ESIS.33.10 78 compact tension specimen – the constraint parameter A is considerably lower SSY A for all crack depths that are used for fracture toughness determination. Figure 4 : Dependence of constraint parameter A on specimen thickness / t W at the center of the crack front for ECP, CCP, TPB and CT specimens ( 10 n  , / 1.0 L P P  ) Figure 5 : Dependence of constraint parameter A on crack depth / a W at the center of the crack front for different specimens ( 10 n  , / 0.5 t W  , / 0.75 L P P  ).