Abstract
The influences of testing specimen thickness (TST) on fracture toughness, including drop weight tear test shear area (DWTT) and crack tip opening distance (CTOD), are studied by experimental method for X70 steel. Results show that DWTT and CTOD reduce gradually with the specimen thickness increasing, showing an apparent TST effect. DWTT results also show that the TST effect is more significant at the middle transition temperature range. Parameters including J-integral, constraint parameters (T33&Tz) and plastic volume ratio (Vr) of SENB specimens with different thickness are calculated by FEA method. Then the TST effect correlation of |T33|, Tz and Vr are compared. All parameters show a strong thickness dependent. Crack tip constraint parameters, |T33| and Tz, have a similar variation tendency, but different from that of J. Contrary, Vr has a more similar variation tendency with J. Therefore, plastic deformation behavior cannot be ignored during studying the TST effect of X70 steel. Vr can be treated as an alternate parameter to explain TST effect.
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