Estimation procedures for J and CTOD fracture parameters experimental evaluation using homogeneous and mismatched pinloaded SE(T) specimens
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2010-07-22
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DE OLIVEIRA, G. P.
Gustavo Donato
Gustavo Donato
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American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
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DE OLIVEIRA, G. P.; DONATO, G. Estimation procedures for J and CTOD fracture parameters experimental evaluation using homogeneous and mismatched pinloaded SE(T) specimens. American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, v. 3, p. 701-710, July, 2010.
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Experimental evaluation of geometry-dependent material's fracture resistance using constraint-designed SE(T) specimens has proved to be an accurate option to assess the structural integrity of pipelines and pressure vessels reducing excessive conservatism. In this context, this work presents procedures for experimental J-integral and CTOD (δ) evaluation using the eta (η) method applied to tension pin-loaded SE(T) specimens made of homogeneous materials and also containing mismatched joints. Initially, the conceptual background is presented, followed by the description of the refined non-linear finite element models developed, which provide the necessary evolution of load with increased load-line and crack mouth opening displacement. As results, are presented η factors for Jintegral estimation and CTOD calculations, which are not available in current standardized procedures. The main objective is to allow fracture resistance experimental evaluation using specimens of different a/W-ratios, material flow properties, weld joint configurations and levels of weld strength mismatch. The main motivation is the possibility of enhancing accuracy of pressure vessels and piping integrity assessments, since these later present very close fracture conditions if compared to SE(T) specimens. The present results, when taken together with previous developments, extend the knowledge about the use of pin-loaded SE(T) specimens. The reader should enhance the studies about the topic with the complimentary paper with the same title beginning but involving clamped SE(T) specimens. Copyright © 2010 by ASME.