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- W2465209945 abstract "The significant petroleum reserves in the Arctic drives the need for offshore facilities in the Arctic made of ferritic structural steels. Such steel materials often exhibit a brittle fracture mode without noticeable prior plastic deformations. This paper presents a combined experimental and numerical investigation to assess the cleavage fracture failure for high-strength steels used in offshore applications. The experimental program includes a large number of specimens with surface-cracks and special single-edge notched bend, SE(B), specimens, tested under a lower ambient temperature of -60 and -90 degree Celcius. The proposed experimental approach extends the eta-approach to measure the material fracture toughness at the cleavage fracture failure. In contrast to the conventional through-thickness fracture specimens, which experience an approximately uniform crack driving force along the entire crack front, the specimens with a curved crack front indicates strong variations in the crack driving forces along the crack front. This study therefore utilizes an average toughness value calculated from the eta-approach to describe the scatter observed in the fracture toughness, similar to a previous investigation [1]. This study also presents a numerical investigation using the local Weibull stress approach to estimate the probability of cleavage fracture in the fracture tests. A combination of the fracture initiation zone defined by the J -integral values with a local Weibull stress driving force predicts reasonably well the probability of fracture of the experimental specimens. Reference: [1] Qian, X. and Li, Y. A compliance-based approach to measure fracture resistance curve for surface-cracked steel plates. International Journal of Fracture, 182, 1-19." @default.
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- W2465209945 date "2016-01-01" @default.
- W2465209945 modified "2023-09-28" @default.
- W2465209945 title "Assessment of Cleavage Fracture in Specimens with a Curved Crack Front for High-Strength Steels in Offshore Applications" @default.
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- W2465209945 doi "https://doi.org/10.1016/j.prostr.2016.06.257" @default.
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