Abstract
Developed by R. B. Heady in the early 1970s, the double-cantilever-beam (DCB) test for measuring sulfide fracture toughness was adopted by some laboratories in 1975. Now, four decades later, it seems appropriate to review the nature, evolution, and experience of this powerful test for measuring the sulfide stress cracking (SSC) resistance of steels used in sour oil and gas wells throughout the world. The quantitative nature and high sensitivity of the test make it uniquely capable of discerning the effects of variations in steel chemistry and of the many processing parameters involved in the production of oil country tubular goods. Because of its accuracy in rating the SSC resistance of a product and its virtual insensitivity to the method by which the specimen surface is finished, the DCB test has no peer as a quality control tool. Examples are given and the current utilization of the test by producers and users is discussed.
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