J-Integral modeling and validation for GTS reservoirs.

Martinez-Canales, Monica L. ; Nibur, Kevin A. ; Lindblad, Alex J. ; Brown, Arthur A. ; Ohashi, Yuki ; Zimmerman, Jonathan A. ; Huestis, Edwin ; Hong, Soonsung ; Connelly, Kevin ; Margolis, Stephen B. ; Somerday, Brian P. ; Antoun, Bonnie R.

Sandia National Laboratories

关键词: Non-Destructive Testing.;    Crack Propagation;    Fractures;    08 Hydrogen;    Geometry;   

DOI  :  10.2172/978911
RP-ID  :  SAND2009-0625
RP-ID  :  AC04-94AL85000
RP-ID  :  978911

美国|英语

来源: UNT Digital Library

【 摘 要 】

Non-destructive detection methods can reliably certify that gas transfer system (GTS) reservoirs do not have cracks larger than 5%-10% of the wall thickness. To determine the acceptability of a reservoir design, analysis must show that short cracks will not adversely affect the reservoir behavior. This is commonly done via calculation of the J-Integral, which represents the energetic driving force acting to propagate an existing crack in a continuous medium. J is then compared against a material's fracture toughness (J{sub c}) to determine whether crack propagation will occur. While the quantification of the J-Integral is well established for long cracks, its validity for short cracks is uncertain. This report presents the results from a Sandia National Laboratories project to evaluate a methodology for performing J-Integral evaluations in conjunction with its finite element analysis capabilities. Simulations were performed to verify the operation of a post-processing code (J3D) and to assess the accuracy of this code and our analysis tools against companion fracture experiments for 2- and 3-dimensional geometry specimens. Evaluation is done for specimens composed of 21-6-9 stainless steel, some of which were exposed to a hydrogen environment, for both long and short cracks.