Viacheslav S. Mamutov

Viacheslav S. Mamutov
Peter the Great St.Petersburg Polytechnic University | SPBSTU · Department of Machine Engineering and Metal Pressure Processing Technology

Doctor of Engineering Science

About

18
Publications
1,116
Reads
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81
Citations
Citations since 2016
6 Research Items
58 Citations
2016201720182019202020212022024681012
2016201720182019202020212022024681012
2016201720182019202020212022024681012
2016201720182019202020212022024681012

Publications

Publications (18)
Article
Full-text available
Electro-Hydraulic Forming (EHF) is a high rate sheet metal forming process based on the electrical discharge of high voltage capacitors in a water-filled chamber. During the discharge, the pulsed pressure wave propagates from the electrodes and forms a sheet metal blank into a die. The performed literature review shows that this technology is suita...
Article
Problems of estimation of pulse magnetic field strength distribution across the affected area is an important component in the design and use of inductor systems for the electro-magnetic technologies including forming, joining and welding. Using a sensor placed between the coil and the blank, it is possible to measure strength of magnetic field in...
Article
This paper is devoted to the analysis of loading and deforming mechanics of a thin sheet metal by electro-hydraulic forming. A specific example using the finite-element LS-DYNA code demonstrates some features of a plasma expansion in discharge channel dynamics, pressure in the discharge chamber, loadings and deformation of a sheet metal part. The s...
Article
Electrohydraulic forming (EHF) is based upon the electro-hydraulic effect: a complex phenomenon related to the high voltage discharge inside the water filled chamber. The resulting shockwave in the liquid is propagated toward the blank, and the mass and momentum of the water in the shock wave accelerates the sheet metal blank toward the die. Method...
Article
Electrohydraulic stamping based on a high-voltage electric discharge in a liquid is used for producing sheet metal parts. The nature of stamping process is defined by nonlinear transient processes in a discharge circuit, in a plasma channel, in a compressible liquid and in an elastoplastic deformable shell. The computer model of process based on fi...
Conference Paper
Calculation of stamping of thin-sheet metals by movable media is often concerned with parameters definition of the loading pressure that changes in time. For the finite-element simulation with LS-DYNA code the approach for estimation of pressure parameters at static loading is developed. This approach provides convergence to a static case of the pr...
Article
Wrinkling of workpiece is one of the major problems occurring at application of impulse drawing of thin sheet metal. The loss of shell stability appears in the areas with compressive stresses and is basis of buckling phenomenon. The nonlinear explicit finite element code LS-DYNA was used for prediction wrinkling. Pulse pressure and strain hardening...
Article
Full-text available
Electromagnetic forming technologies are based on high-voltage discharge of capacitors through the conductive coil. Two methods of testing and the results of dynamic coefficient kd for aluminum alloys, copper, brass, steel, and some other materials are presented. The first method is based on expansion of rings machined from tubular blanks, which ar...
Article
A computer model of deforming a thin axisymmetric shell in Lagrangian-Euler coordinates under consecutive static and pulse loading was created. Consecutive loading reduces the wedging-out of a formed article and increase the stretching degree at the expense of magnification of deforming a flange folding in drawing. Deformation hardening of a materi...
Article
In this presentation, results on sheet metal forming using pulsed electromagnetic and electrohydraulic technologies will be discussed. Pulsed electromagnetic forming is based on high-voltage discharge of capacitors through a coil. An intense transient magnetic field is generated in the coil and through interaction with the metal work-piece, pressur...
Article
In technological devices such as an electromagnetic hammer, a mobile part in form of a mechanical concentrator transforms impulse pressure of an electromagnetic field to an effort of stamping. The two-dimensional wave transformation of impulse pressure in an elastic concentrator with boundary conditions, conforming magnetic- pulse stamping by polyu...
Article
There is presented the method of obtaining behavioral diagrams of sheet metal ultimate strains based on the effect of burst development of straining while arising plastic instability of a shell under conditions of loading system excess energy. The method of measuring duration of plastic instability stage and strain rate is offered.
Article
To develop computer-aided design system for high-speed stamping processes (electrohydraulic pulse, magnetic pulse, hydraulic shock), it is suggested that a set of simple model be used which solve special problems. The important integral part of the model is the description of billet shaping. Relationships are derived to estimate errors due to the n...

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