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The use of precracked and notched specimens in slow strain rate testing (SSRT) has important advantages, the main one being the localization of the environmental effect in the vicinity of the crack or notch tip. There is, however, an important difficulty in interpretation of results: the local strain rate at the crack or notch tip—and not the externally applied displacement rate—is the variable that controls the environmental cracking. In this paper, results from SSRT of a wide range of notched geometries are compared, showing the interest of presenting the results as a function of local strain rate at the notch tip.
slow strain rate testing (SSRT), precracked specimens, notched specimens, local strain rate, global strain rate, environmentally induced cracking (EIC), stress corrosion cracking (SCC), hydrogen assisted cracking (HAC)
Professor, University of La Coruña, Arteixo, La Coruña