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09094 NACE TM0177 Method a Uniaxial Tensile Testing: Learnings from Investigations on Test Procedure

Picture for 09094 NACE TM0177 Method a Uniaxial Tensile Testing: Learnings from Investigations on Test Procedure
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Product Number: 51300-09094-SG
ISBN: 09094 2009 CP
Author: Nicolas Dulcy, Chris Desadier, E. Paul Cernocky, Bruce E. Urband, HervÈ Marchebois, Frederic Legay
Publication Date: 2009
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The NACE TM0177 Method A Uniaxial Tensile test using a proof-ring device is extensively employed in order to assess the Sulfide Stress Cracking (SSC) susceptibility which can occur on Oil Country Tubular Goods (OCTG) and Line Pipes (LP). It is also well understood that different test methods may not necessarily provide the same ranking. This is the reason why replicate testing is advisable to tighten as much as possible the scattering of the SSC threshold. Nevertheless, SSC test results can show statistical variability for the same material. The aim of this paper is to check whether the applied stresses are uniformly distributed within the tensile specimen. Shared data regarding the presence of bending phenomenon are compared when stressing test specimen instrumented with strain gages. Order of magnitude is also quantified on different test equipment. Discussion on the influence of other parameters such as machining, polishing, storage of the specimens and test procedure is presented as well in order to share the experience on the NACE Method A test.

Keywords: NACE TM0177 Method A, Uniaxial Tensile test, applied stress, bending, machining, polishing, storage, test procedure
The NACE TM0177 Method A Uniaxial Tensile test using a proof-ring device is extensively employed in order to assess the Sulfide Stress Cracking (SSC) susceptibility which can occur on Oil Country Tubular Goods (OCTG) and Line Pipes (LP). It is also well understood that different test methods may not necessarily provide the same ranking. This is the reason why replicate testing is advisable to tighten as much as possible the scattering of the SSC threshold. Nevertheless, SSC test results can show statistical variability for the same material. The aim of this paper is to check whether the applied stresses are uniformly distributed within the tensile specimen. Shared data regarding the presence of bending phenomenon are compared when stressing test specimen instrumented with strain gages. Order of magnitude is also quantified on different test equipment. Discussion on the influence of other parameters such as machining, polishing, storage of the specimens and test procedure is presented as well in order to share the experience on the NACE Method A test.

Keywords: NACE TM0177 Method A, Uniaxial Tensile test, applied stress, bending, machining, polishing, storage, test procedure
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