INFLUENCE OF METAL LAYER SURFACED WITH LOCAL ADDITION OF AMPLIFER ON THE STRESSED AND DEFORMED STATE OF THE PLATE

Abstract

One of the important aspects of the surfacing process, both restorative and strengthening, is the formation of metal layers that differ significantly in physical and mechanical properties from the base. At the same time, the local action of a concentrated heat source causes uneven heating of the workpiece in thickness, and the crystallization of the deposited layer is accompanied by casting shrinkage and structural transformations, the stress-deformed state of such objects will be quite unfavorable both from the point of view of forming and the subsequent operation of the finished products. In view of this, based on the methods of the theory of elasticity, develop an algorithm for analytically determining the stress-strain state of a welded plate of considerable width as a composite two-layer material under the influence of external normal loading, taking into account the location of zones of increased hardness in the form of strips in the welded layer. The surfaced prismatic plate was adopted as a two-layer structure, in which the deformations of the material are directly proportional to the stresses. The deposited layer is continuous. The thickness of the plate and the deposited layer are unchanged. By using the dependences of the stress-strain state indicators on one stress function, a mathematical model of the welded plate as a two-layer structure was formed. An algorithm for determining the deformations and distribution of stresses in the plate under the condition of its flat deformation in the direction of surfacing is constructed. The periodic change of the modulus of elasticity of the deposited layer is taken into account. The indicators of the stress-strain state of the plate from its normal load were determined. The effect of Poisson's ratio on the layer-by-layer distribution of stresses in the plate is shown.