Estimation of the resistance to the initiation of fatigue cracks in the welded joints of steel constructions

The problem of choosing an effective approach to determining the fatigue strength of welded butt joints at the stage of crack nucleation is solved. The results of the calculations performed according to the existing building code from the specified strength characteristics and the calculations that...

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Bibliographic Details
Published in:Russian metallurgy Metally 2017-04, Vol.2017 (4), p.334-338
Main Authors: Odesskii, P. D., Shuvalov, A. N., Emel’yanov, O. V.
Format: Article
Language:English
Subjects:
Alloys
Building codes
Butt joints
Butt welding
Chemistry and Materials Science
Crack initiation
Crack propagation
Deformation
Diagnostics and Mechanical Test Techniques
Elastoplasticity
Fatigue cracks
Fatigue failure
Fatigue strength
Fatigue tests
Fracture mechanics
Low cycle fatigue
Materials fatigue
Materials Science
Mathematical analysis
Metal fatigue
Metallic Materials
Nucleation
Steel construction
Stress concentration
Welded joints
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Summary:The problem of choosing an effective approach to determining the fatigue strength of welded butt joints at the stage of crack nucleation is solved. The results of the calculations performed according to the existing building code from the specified strength characteristics and the calculations that take into account local elastoplastic deformation in stress concentration zones are compared. Full-scale specimens of the welded joints of pair angles are tested in the low-cycle fatigue region at a constant load. The kinetics of the state of stress in the zones of terminating flange welded joints is studied by a tensometric method. It is shown that the stage of fatigue crack nucleation is best described using the deformation criterion of fracture: a comparison of the results of calculating the number of cycles to the nucleation of a fatigue crack with experimental data demonstrates good agreement.
ISSN:0036-0295
1555-6255
1531-8648
DOI:10.1134/S0036029517040176