MODELLING OF THE PROCESS OF ELASTIC-PLASTIC DEFORMATION OF A LAYERED METAL COMPOSITION WELDED BY EXPLOSION

V. V. Dragobetskiy, V. G. Zagoyanskiy, I. I. Fedorac

Abstract


Purpose – to adapt the parametric mathematical model of the process of forming of a layered metal shell under pulse deformation based on the finite difference method, as well as to establish and compile the data on the mechanical properties and regularities of their distribution over the thickness of the layered work-piece. Approach A bimetallic work-piece is covered with a spatial Lagrangian mesh X1X2 connected with the middle surface. We use a "nodal scheme." The nodal point of the computational grid of each physical element is the point of bringing the corresponding mass equal to the sum of the masses of the bimetal components and applied to the center of gravity of the element. In the nodal points accelerations are determined. All other values are determined in each component. Mass component points are connected by weightless extensible direct links. Findings А methodology for calculation of technological parameters at the pulse deformation of layered compositions providing the plastic deformation of the contact surface layers was developed. On the basis of the finite-difference approximation of the equations modeling the dynamic behavior of the mechanics of a layered work-piece, algorithms for calculation of its kinematics and stress-strained state are proposed. The results of numerical calculations of the distribution of the radial deformation of the bimetallic stamped work-piece obtained by the explosive welding, change of deformation through the thickness of the bimetallic work-piece and distribution of intensity of deformations are shown. Value Developed algorithms and programs for calculation of the dynamic behavior of a multi-layered shell, critical values of the intensities of strain and stresses at which an interlayer destruction takes place are determined.

Keywords


layered metal composition; explosive welding; elastic-plastic deformation; two-layered shell; finite difference method

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References


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DOI: http://dx.doi.org/10.20535/2305-9001.2016.77.68158

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