Experimental Studies on the Stress-Strain State under Drawing Aluminum–Copper Bimetal Parts Rectangular in Plan

Haikova, Tetiana; Puzyr, Ruslan; Левченко, Роман

doi:10.3103/s1067821220040033

Cited by 21 publications

(3 citation statements)

References 27 publications

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“…Ershov, which are reduced to the problem of finding the extremum of several variables using numerical iterative solution methods and the method of searching for variable parameters, for example, the steepest descent, on a grid. Functions F 1 , F 2 ,…, F n are presented in the form (1), (2). At the same time, we represent elementary processes as a set of even simpler processes.…”

Section: Resultsmentioning

confidence: 99%

“…The reserve for increasing the wear resistance of mining equipment parts is optimization of parameters, power and thermal intensification of these processes, development of fundamentally new methods and technologies of hardening [1,2]. In addition, the search for technologies for restoring the wear resistance of parts without dismantling them is also promising.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of the combined explosion hardening processes

et al. 2021

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The proposed method for calculating the loading parameters makes it possible to determine the wear parameters after explosion hardening. The calculation method is simple and less time consuming compared with calculation methods that involve the use of nonlinear programming methods. The main methods of increasing the wear resistance of mining equipment parts using explosion methods are generalized. The reserve for increasing the wear resistance consists in the optimization of deformation parameters during the power and thermal intensification of processes and the development of new methods and technologies of hardening. The factors (parameters) of the studied processes: explosive cladding, alloying, hardening, are formulated. Optimization of the processes under consideration is possible by decomposing the process into simpler ones with subsequent optimization of the parameters of these processes and the synthesis of the obtained solutions. For the first time, a solution to the multicriteria problem of two-stage explosion hardening is presented. It is proposed to split the process into simpler ones. Optimization criteria are proposed for each of the simplified processes. The problem is reduced to a conditional extremum problem, which is solved by composing the Lagrange function. By transforming the wear equation, the optimal ratio of strength and ductility for parts operating under abrasive wear conditions is determined.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of the combined explosion hardening processes

et al. 2021

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“…The system of differential equilibrium equations is simplified due to the fact that the size of the deformation site along the middle surface of a workpiece and the radii of cur-vature of the median surface are typically much greater than the thickness of a workpiece. Therefore, the stresses acting in the direction of the normal to the thickness of a workpiece are small compared to other stresses, so the stressed state scheme is assumed to be flat [15,43]. To further simplify the system of equilibrium equations, a scheme of axisymmetric deformation is adopted; the stresses become a function of one coordinate.…”

Section: Evaluation Of Existing Analytical Solutions In Stresses For Drawing Cylindrical Partsmentioning

confidence: 99%

Improving the technology for manufacturing hollow cylindrical parts for vehicles by refining technological estimation dependences

Puzyr

Shchetynin

Vorobyov

et al. 2021

EEJET

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This paper shows that the technological preparation of production accounts for 20‒70 % of the total labor intensity of technical preparation. An important role belongs to the applied programs of finite-element modeling. However, such software packages often cannot be purchased by small-scale industrial enterprises for various reasons. Therefore, special empirical and analytical calculation models are used, which have proved to be quite effective in typical metal processing processes. Drawing a cylindrical hollow part was used as an example of the improved analytical dependence to calculate meridional tensile stresses. Existing analytical models of the process accounted for the bending moment through additional stresses. However, this approach only roughly described the deformation process. It was possible to refine the existing analytical dependences by introducing a term into the differential equilibrium equations that takes into consideration the bending moment that acts in the meridional direction when a workpiece passes the rounding on the matrix edge. Analysis of the obtained expression revealed that the bending of a workpiece gives rise to the stretching meridional stresses, which depend on the ratio of the squares of the thickness of the workpiece and the radius of the matrix rounding. The results of the estimation data from the numerical and theoretical models coincided for small values of the radius of the matrix rounding of 1‒2 mm, which confirms the adequacy of the analytical solution. In the numerical model, there is an extreme point where the tensile stresses have a minimum and, after it, begin to increase; this corresponds to the matrix rounding radius of 5 mm

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