J and CTOD fracture toughness estimation using sent specimens with mismatched welds
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Copyright 2011, Brazilian Petroleum, Gas and Biofuels Institute - IBP The primary objective of this investigation is to enlarge on previous developments of J and CTOD estimation procedures for welded tension specimens based upon plastic ? -factors used to estimate elastic-plastic fracture parameters from plastic work. The present analyses enable the introduction of a large set of plastic ? -factors for a wide range of crack sizes (as measured by the a W -ratio) and material properties, including different levels of strength mismatch, characteristic of structural, pipeline and pressure vessel steels. Very detailed non-linear finite element analyses for plane-strain and full 3-D models of standard SENT fracture specimens with a notch located at the center of square groove welds provide the evolution of load with increased crack mouth opening displacement required for the estimation procedure. Overall, the present study, when taken together with previous investigations, provides additional understanding on the effect of weld strength mismatch on J and CTOD toughness measurements while, at the same time, adding a fairly extensive body of results to determine parameters J and CTOD for different materials using tensile SENT specimens with varying geometries and mismatch levels.
