Fractal analysis of surface micro-topography for a rolled anisotropic thick sheet of aluminium alloy AA2024-T351

7th International Conference on Advanced Concepts in Mechanical Engineering

Pirva, E.^1 ; Tudor, A.^1 ; Gavrus, A.^2

Machine Elements and Tribology Department, IMM, UPB, Bucharest, Romania^1

Mechanical and Civil Engineering Laboratory, LGCGM (EA3913), INSA Rennes, France^2

关键词: Anisotropic surfaces;    Fractal geometry;    Fractal parameters;    Metallic material;    Micro topography;    Spatial complexity;    Structural function;    Surface roughness parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/147/1/012017/pdf
DOI  :  10.1088/1757-899X/147/1/012017

来源: IOP

【 摘 要 】

Fractal geometry has gained attention in recent years and represents a problem of high interest for the characterization of surface topography. In this study it was analyzed the surface micro-topography for a rolled thick sheet anisotropic metallic material of type 2000 series aluminium alloy (AA2024-T351). In order to analyze and to characterize the corresponding anisotropic surfaces, profile of particular samples were recorded with a specialized apparatus Mitutoyo SJ-301 (Japan). The random nature of the roughness height is described through statistical analysis. The irregularity of the surface profile has been measured using a lot of conventional surface roughness parameters such as: arithmetic average, mean square root, maximum height of the profile, etc. Fractal analysis provides a useful way to characterize the observed spatial complexity of surface micro-topography. For this study it was used the structural function method to calculate two specific fractal parameters: D (fractal dimension) and L (topothesy). The fractal dimension of all samples it's been be calculated by plotting curves on log-log axes.