Variation of Relief Topography and Hardness of Surface Layers of Materials Due to Impact-Oscillatory Loading

Mykola Chausov,Iurii Burda,Pavlo Maruschak,Andrii Pylypenko,Roman Bishchak,Janette Brezinová

doi:10.3390/ma12172720

Abstract

It was shown previously that cyclic loading can be used to extend the fatigue life of sheet plastic materials subjected to the preliminary impact-oscillatory loading. This type of loading causes dynamic non-equilibrium processes (DNP) in materials, which lead to the formation of dissipative structures in materials and on their surface. The density of these dissipative structures is less than that of the base metal. In this paper, the results of investigations into the relief and hardness of surface layers modified by impact-oscillatory loading are analyzed on the example of five structural materials. The signs of a regular, orderly system of microextrusions formed on flat surfaces of all materials due to DNP are considered along with the alignment of roughness parameters Rz and Ra of relief profiles. The effect of impact-oscillatory loading is one of the main causes that lead to the extension of the fatigue life of materials.

Highlights

Experimental investigations into the mechanical behavior of plastic materials under dynamic non-equilibrium processes (DNP) require further study and generalization of material deformation patterns [1,2,3,4,5]
These methods presume the presence of multiscale carriers of plastic deformation and consider the thermodynamics of non-equilibrium processes [5,6,7]
Tests were performed on sheets of industrial aluminum alloys D16ChATW and 2024-T351, Tests were on sheets of industrial aluminum and 2024-T351, two-phase (α + performed β phase) titanium alloys

Summary

Introduction

Experimental investigations into the mechanical behavior of plastic materials under dynamic non-equilibrium processes (DNP) require further study and generalization of material deformation patterns [1,2,3,4,5]. Structural transformations that occur in a material under DNP are considered using the methods of physical mesomechanics. These methods presume the presence of multiscale carriers of plastic deformation and consider the thermodynamics of non-equilibrium processes [5,6,7]. New possibilities are provided for upgrading the machining technology of materials used in the manufacture of load-bearing structures of transport systems. The revealed deformation patterns can be systematized, and the durability of load-bearing structures can be predicted [8,9,10]

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Conclusion