09309 Evaluation of Testing Conditions Effects on the Resistance to Sulfide Stress Cracking

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Product Number: 51300-09309-SG

ISBN: 09309 2009 CP

Author: Richard E. Bravo, Teresa Perez, Maria J. Cancio, Sebastian Cravero and Hugo A. Ernst

Publication Date: 2009

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Sulfide stress cracking is becoming a more critical issue due to higher levels of H2S in new reservoirs. Furthermore, more severe working conditions in terms of mechanical loads in H2S reservoirs requires steels with higher sulfide stress cracking resistance than conventional steels grades. For that reasons it is of fundamental importance to evaluate the methods used to determine the fracture resistance in sour environment. In this work, finite element analysis was used to model the hydrogen concentration in the loaded double cantilever beam sample used in the NACE standard, method D. Experimental measurements were used to establish hydrogen concentration in unstressed material. A fracture criterion for the embrittled material was proposed and the parameters involved were adjusted for the different materials studied. Finally, a steady state model of DCB specimens in sour environment was developed combining the finite element analysis and the fracture criterion. The DCB model was used to assess the effect of yield stress and hydrogen concentration on KISSC values.

Keywords: Sour environment, sulfide stress cracking, double cantilever beam, stress intensity factor