Development of new analytical methods for calculating stresses in concentration zones of thin-sheet butt-welded joints

Work number - M 33 AWARDED

Presented E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine

Authors:
1. MOLTASOV Andrii Valerii – candidate of engineering sciences, senior researcher of E.O. Paton Electric Welding Institute of the NAS of Ukraine;
2. MOTRUNICH Sviatoslav Igor – candidate of engineering sciences, senior researcher of E.O. Paton Electric Welding Institute of the NAS of Ukraine.

On the basis of the modified hypothesis of broken sections, analytical methods for calculating stresses in the transition zones from the seam to the base metal of thin-sheet butt-welded joints with seams of different configurations were developed. In the work, the specified hypothesis was improved in terms of the hypothetical direction of movement of broken sections during stretching or bending of the connection, which made it possible to ensure the conditions of unequivocal stress at all points of the section. The range of validity of the formulas for determining the stress concentration coefficient in joints with a bilateral symmetrical seam, in contrast to existing analogues, extends to thin-sheet joints. Mathematical formulas for determining the coefficient of stress concentration around the root of the seam were obtained for the first time.

Stress concentration is one of the main factors that affect the fatigue resistance of welded joints, therefore, accurate determination of the real stress state of thin-sheet welded structures is of important scientific and practical importance to ensure their fatigue strength and cyclic durability.

The method of determining stresses in joints with a symmetrical seam is the basis of the methodology for the design and evaluation of the static strength of the welded disk of the exhaust fan impeller, manufactured at “Soyuzenergomash” LLC, which is successfully operated at the Ladyzhynskaya TES of PJSC “DTEK Zahidenergo”.

Number of publications: 12 articles in journals included in category «А» (including 8 in foreign editions) and 15 articles in journals included in category "B", 6 abstracts. The total number of references to authors' publications/h-index by work according to databases is, respectively: Web of Science 65/8, Scopus 108/11, Google Scholar 270/13.

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