Fracture toughness requirement for fracture performance evaluation of welded joints based on the local approach

Conference · Sun Dec 01 04:00:00 EST 1996

OSTI ID:403613

Minami, Fumiyoshi; Ohata, Mitsuru; Toyoda, Masao ^[1]; North, T H ^[2]; Tanaka, Teruyuki; Arimochi, Kazushige; Glover, A G

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1. Osaka Univ. (Japan). Dept. of Welding and Production Engineering
2. Univ. of Toronto (Canada). Dept. of Metallurgy and Materials Science

A new evaluation procedure has been proposed in this paper to determine the required fracture toughness as a function of the required deformability of structural components. This procedure is characterized by the equivalent CTOD (Crack Tip Opening Displacement) concept which provides the compatible Weibull stress between the 3-point bend specimen and the structural component. The present procedure was useful for the estimation of the fracture performance of notched wide plates from 3-point bend CTOD results, while the analysis based on the conventional CTOD concept gave very conservative estimation. The strength mis-match effect on the required toughness of the weld metal to meet the design requirement can be quantified by the equivalent CTOD concept. It was demonstrated by the numerical simulation using the welded joint of a Grade 550 pipeline steel that the required bend CTOD {delta}{sub 3P}{sup R} was much smaller than the required CTOD {delta}{sub WP}{sup R} for the wide plate. The required weld metal CTOD {delta}{sub WP}{sup R} for the wide plate increased with decreasing the yield strength mis-match ratio {sigma}{sub Y}{sup W}/{sigma}{sub Y}{sup B} between the base and weld metals. By contrast, the required bend CTOD {sigma}{sub 3P}{sup R} of the weld metal was not always sensitive to the mis-match condition in welds.

• OSTI ID: 403613
• Report Number(s): CONF-9606279--; ISBN 0-7918-1492-0
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
BENDING
CARBON STEELS
CHEMICAL COMPOSITION
FRACTURE PROPERTIES
MECHANICAL PROPERTIES
MECHANICAL TESTS
PIPELINES
STRESS ANALYSIS
WELDED JOINTS