The Paton Welding Journal, 2009, №11



2009 №11 (01)

2009 №11 (03)

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TPWJ, 2009, #11, 12-15 pages  
INFLUENCE OF DEFORMATION MECHANISM IN THE COLLISION ZONE OF MATERIAL PAIRS ON SELECTION OF OPTIMUM PARAMETERS OF EXPLOSION WELDING


Journal                    The Paton Welding Journal
Publisher                 International Association «Welding»
ISSN                       0957-798X (print)
Issue                       № 11, 2009 (November)
Pages                      12-15
 
 
Authors
M.P. BONDAR
M.A. Lavrentiev Institute of Hydrodynamics, RAS SD, Novosibirsk, RF
 
 
Abstract
The necessary condition for providing a strong joint between the bodies in a region of the lower boundary of explosion welding is formation of a zone of intensive plastic deformation with a localization band along the joint interface. The mechanisms of formation of bands of plastic deformation localization (BPDL) under high-velocity loading depend on grain size of initial materials. It is shown that initiation of BPDL in a coarse-grained material occurs at ε = 0,2...0,3 and is related to loss of shear stability. There is a certain critical grain size d_кр, starting from which the prevailing deformation mechanism is slipping along the grain boundaries, like in a nanocrystalline material. Being a result of rotation instability, in a fine-grained material BPDL are formed at high velocities and deformations of ε′ > 10⁴ c^-1 and ε ≤ 2.
 
 
Keywords: explosion welding, grain size, high-rate deformation of metals, deformation mechanism, plastic deformation, slipping
 
 
Received:                ??
Published:               28.11.09
 
 
References
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9.             Nesterenko, V.F., Bondar, M.P. (1994) Localization of deformation at collapse of thick-wall cylinder. Ibid., 30(4), 99-111.
10.           Bondar, M.P., Merzhievsky, L.A. (2006) Evolution of metal microstructure and conditions of deformation localization at high-rate loading. Ibid., 42(3), 121-131.
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