The Paton Welding Journal, 2019, №05



2019 №05 (01)

DOI of Article 10.15407/tpwj2019.05.02

2019 №05 (03)

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The Paton Welding Journal, 2019, #5, 13-17 pages
 
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue #5, 2019 (May)
Pages 13-17

Stress-strain state of welded and brazed assemblies from dissimilar materials with soft interlayer at thermal loading

V.V. Kvasnytskyi¹, V.F. Kvasnytskyi², M.V. Matvienko², E.A. Buturlya² and G.V. Yermolayev²

¹National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute» 37 Peremohy Prosp., Kyiv-56, Ukraine. E-mail: kvas69@ukr.net
²National University of Shipbuilding 9 Heroiv Ukrainy Prosp., 54025, Mykolaiv, Ukraine. E-mail: welding@nuos.edu.ua

Computer modeling by finite element method was used to study the stress-strain state in joints of homogeneous materials under axial load. The studies were carried out taking into account plastic deformations in soft interlayers, which are usually used in diffusion welding to activate surfaces and reduce residual stresses. In brazing the intermediate layer is the braze weld, that differs from the base metal in its physical and mechanical properties. It is shown that along the butt, both in the metals being joined, and in the interlayer, equivalent stresses are distributed more uniformly than during elastic deformation. Plastic deformations in the interlayer are absent in the zone of stagnation (on the axis of the cylindrical assembly) and are almost linearly increased, reaching maximum values (about 6.5 %) at the outer cylindrical surface of the assembly. A high level of plastic deformations indicates the feasibility of using thermal loading in diffusion welding of dissimilar materials with soft interlayers. The degree of «softness» of the interlayer and its effect on the stress-strain state of the assembly during plastic deformation is mainly determined by its strength (yield limit) and almost does not depend on its rigidity (moludus of elasticity). 8 Ref., 1 Table, 10 Figures.
Keywords: welded and brazed assemblies, soft interlayer, computer modeling, stress-strain state, thermal loading

 
Received: 12.02.19
Published: 30.05.19
 
 

References

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5. Kvasnytskyi, V.V., Kvasnytskyi, V.F., Dong Chunlin et al. (2018) Stressed state of welded and brazed assemblies from similar materials with a soft interlayer under axial loading. The Paton Welding J., 4, 6-10. https://doi.org/10.15407/tpwj2018.04.01
6. Kvasnytskyi, V.V., Yermolayev, H.V., Matviienko. M.V. (2017) Mechanics of bonds in diffusion welding, soldering and spraying of dissimilar materials under elasticity conditions. In: Monography. Nikolaev, NUK [in Russian].
7. Makhnenko, V.I., Kvasnitsky, V.V. (2009) Peculiarities of formation of stress-strain state in diffusion bonds between dissimilar materials. The Paton Welding J., 8, 7-11.
8. Ermolaev, G.V., Martynenko, V.A., Olekseenko, S.V. et al. (2017) Effect of the rigid interlayer thickness on the stress-strain of metal-graphite assemblies under thermal loading. Strength of Materials, 49(3), 422-428. https://doi.org/10.1007/s11223-017-9882-4

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