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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
Published on: April 25, 2019
Variation of Relief Topography and Hardness of Surface Layers of Materials Due to Impact-Oscillatory Loading
Mykola Chausov1, Pavlo Maruschak2, Andrii Pylypenko1
1Department of Mechanics, National University of Life and Environmental Sciences of Ukraine, Heroiv Oborony str. 15, 03041 Kyiv, Ukraine.
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.
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