TL;DRAbstract
For quite some time now, the Slow Strain Rate (SSR) test has been used in the Oil Patch as a Lot Acceptance Criterion. The most common pass/fail criteria for SSR testing is the ratio of Time to Failure (TTF), Percent Reduction of Area (%RA), or Percent Elongation (%E1), or a combination thereof, measured in an environment relative to the same parameter in an inert environment (air or nitrogen). Specimens are typically examined for secondary cracking away from the main fracture surface. However, there are many innate problems associated with the SSR test that complicate its use as a lot acceptance criterion. The nature of these problems is discussed, along with corrective actions.
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For quite some time now, the Slow Strain Rate (SSR) test has been used in the Oil Patch as a Lot Acceptance Criterion. The most common pass/fail criteria for SSR testing is the ratio of Time to Failure (TTF), Percent Reduction of Area (%RA), or Percent Elongation (%E1), or a combination thereof, measured in an environment relative to the same parameter in an inert environment (air or nitrogen). Specimens are typically examined for secondary cracking away from the main fracture surface. However, there are many innate problems associated with the SSR test that complicate its use as a lot acceptance criterion. The nature of these problems is discussed, along with corrective actions.
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