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Title: Fracture and Failure Assessment of Fatigue-Cracked Circular Hollow Section X-Joints
Keywords: tubular joints, surface crack, fracture, lamellar splitting, failure assessmentdiagram, compliance technique
Issue Date: 24-Jan-2013
Source: OU ZHIYONG (2013-01-24). Fracture and Failure Assessment of Fatigue-Cracked Circular Hollow Section X-Joints. ScholarBank@NUS Repository.
Abstract: In the present study, five fatigue cracked large-scale circular hollow section X-joints with different surface crack profiles at the weld toe were tested under in-plane bending. The present study discovered the first incidence of brittle lamellar splitting phenomenon in laboratory for large-scale joints with fatigue cracks, which severely decreased the ductility of the joint. The failure assessment analyses, integrating the fracture resistance curve obtained from the small-scale fracture specimen, the crack profile in the large-scale tubular joint, and the crack driving force from detailed finite element models, were performed. The ductile tearing assessment following the procedure outlined in BS7910 indicated that the level 2A assessment curve did not provide a conservative estimation on the failure load causing the brittle fracture observed in the experiment. The level 3C curve, in contrast, showed safe estimations. Based on the findings, the research proposed corrective measures for assessment with the level 2A curve and recommends the use of level 3C curve for X-joints under in-plane bending.
Appears in Collections:Ph.D Theses (Open)

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