Abstract Using the results of testing industrial batches of 23 mm steel heavy plates after thermomechanical rolling and subsequent post-weld heat treatment, the patterns of fatigue cracks formation in the fracture specimens during CTOD (Crack Tip Opening Displacement) testing for fracture toughness are investigated. Visual, microstructural, and fractographic studies of the nature of fracture formation and the surface of the secondary separations have been conducted. The probable causes of the manifestation of the potential «pop-in» effect on the load-displacement diagrams of the notch opening displacement are described, as well as its potentially negative impact on the interpretation of test results
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Goli-Oglu et al. (2024) studied this question.
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