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Thin circular hollow section-to-plate T-joints: stress concentration factors and fatigue failure under in-plane bending


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Mashiri, FR and Zhao, XL 2006 , 'Thin circular hollow section-to-plate T-joints: stress concentration factors and fatigue failure under in-plane bending' , Thin-Walled Structures, vol. 44, no. 2 , pp. 159-169 , doi: 10.1016/j.tws.2006.02.003.

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Welded thin-walled (t<4mm) tube-to-plate T-joints made up of cold-formed circular hollow sections welded onto a
plate to form a moment resistant connection are used in the road transport and agricultural industry to manufacture
equipment and other structural systems. Fatigue design of these joints is not available in current standards. An
understanding of the stress concentrations and failure in these connections is therefore necessary as a step towards
understanding the fatigue behaviour of these connections. Stress concentration factors (SCFs) of welded thin-walled
(t<4mm) circular hollow section (CHS)-to-plate T-joints are determined at different locations along the weld toes on the
tubular brace. The distribution of SCFs along the weld toes shows that the highest SCF occurs at the weld toes in the
circular brace at the 0o line. The ratio of the end of test fatigue life (N4) to the through thickness fatigue life (N3) in the thin CHS-Plate T-joints is found to fall within the range of N4/N3 found in previous research of both thick and thin-walled joints. Surface crack growth monitoring is used to obtain an approximation of the length of surface crack at the point of occurrence of a through thickness crack. The relationship between surface crack length and the occurrence of a through thickness crack is important in that it can be used as a measure of the criticality of a surface crack during structural health monitoring of equipment or structures.

Item Type: Article
Authors/Creators:Mashiri, FR and Zhao, XL
Keywords: Fatigue; Circular hollow section; Hot spots; Stress concentration factor; Failure
Journal or Publication Title: Thin-Walled Structures
ISSN: 0263-8231
DOI / ID Number: 10.1016/j.tws.2006.02.003
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