Abstract
Simulation modeling of the deformation under mechanical action on the sample workpiece of the steel-aluminum bimetallic composite material with a thin aluminum intermediate layer was performed. The stress-strain state along the boundaries of the joint at which the sample workpiece layering occurs was determined. A series of computational experiments with varying the specific work value of the layering under separation conditions was implemented. The level of stresses, leading to the separation of the bimetallic compound, is estimated using the energy criterion. The dependence of the rupture strength along the ring contour on the specific work value of the layering varied in the range of 0.1-0.2 N/mm was calculated. It was established that for the studied variants of the computational experiment, a rigid stress state with the predominance of normal tensile stresses is implemented in place of the beginning of the layering.
Highlights
Layered metal composite materials (LMCM) based on low carbon steels and aluminum alloys, obtained by the method of hot rolling, are increasingly used
In the studied sample workpiece, plastic deformation is concentrated in the intermediate layer near the punch
Depending on the GIС values used in the calculations, the degree of plastic deformation until the moment of separation in the interlayer is 0.013, 0.017 and 0.02, respectively, I was established that for all variants of the calculation, the stress state indicator at the place of layering is k = 0.58, and the Lode-Nadai index μσ = + 1
Summary
Layered metal composite materials (LMCM) based on low carbon steels and aluminum alloys, obtained by the method of hot rolling, are increasingly used. In the development of processes and the manufacture of multilayer metals, quality assessment of the compound is carried out by mechanical and in-process testing of the compound samples, as well as metallographic studies of the boundaries of the materials joint. The known methods of mechanical, in-process testing and metallographic studies do not always allow assessing the quality of the layers joint, for example, for composites with a thickness of layers or interlayer less than 1 mm. One of the typical damages to layered materials during deformation is layering along the joint boundary. Layers alternation schemes, as well as the thickness of the layers, apply their own characteristics of such materials deformation under the same test conditions. Identification of fracture patterns at the boundaries of multilayer metallic materials under various types of impact is a rather complex task, the solution of which is still far from completion
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