Fracture toughness assessment of surface cracks in slender ultra-high-strength steel plates

Narström, Torbjörn (author): KTH,Teknisk mekanik,Department of Engineering Mechanics, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden; SSAB Special Steels AB, 613 31 Oxelösund, Sweden

Barsoum, Zuheir, 1978- (author): KTH,VinnExcellence Center for ECO2 Vehicle design,Farkostteknik och Solidmekanik

(creator_code:org_t)

Elsevier Ltd, 2023
2023
English.
In: Engineering Fracture Mechanics. - : Elsevier Ltd. - 0013-7944 .- 1873-7315. ; 289

Related links:: https://doi.org/10.1...; show more...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

Safe design against unstable fractures in load-bearing structures is crucial at sub-zero temperatures where the brittle fracture toughness can be unfavourable, especially for high-stress designs incorporating ultra-high-strength steels. The brittle fracture toughness of surface cracks in structural steel with a minimum yield strength of 1300 MPa is, for this reason, tested in the present study at sub-zero temperatures. The realistic flaws are compared with single-edge notched specimens (SEN(B)) from thicker plates with the same chemical composition, using a representative fracture toughness for a three-dimensional crack front according to the Master Curve method. A novel approach determines the latter without considering the local temperature and constraint variation through empirical relations. The experimental result shows a difference in the reference temperature between the two specimen types, which likely is the natural variation of the manufactured materials and/or a loss of constraint due to the difference in the scaled specimen deformation level.

By the author/editor: Hultgren, Gustav; Boåsen, Magnus; Narström, Torbjö ...; Barsoum, Zuheir, ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Applied Mechanic ...

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