Numerical Analysis of the Effect of Surface Finish and Material Properties on the Carburized Moly Based Low Alloy Material Subjected to A Contact Load
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Date
2022-10
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Addis Ababa University
Abstract
Contact between rough surfaces between surfaces affects a variety of phenomena including friction, wear,
thermal contact resistance, and electrical contact resistance. Different studies done on the mechanics of
contacting bodies using analytical and experimental methods. Even though the experimental method to
determine the surface treatment parameters is convenient and effective, the method is very expensive,
consume more time to complete and it needs advanced tools. Furthermore, the analytical methods in
analyzing real surface topography is a simplifying approach, which has low accuracy. Therefore,
numerical modeling of the contact between rough surfaces is the alternative method. the aim of the study
was to model the contact pressure contacting bodies to determine the effect of material density variation
and surface finish method (machined and powder metallurgy surface) using finite element analysis utilizing ABAQUS software. The plastic contact of a rough surface and smooth flat surface is analyzed by modeling the rough surface as an isotopic, Gaussian, and random process. For running FE analysis an interface MATLAB code and Solid work software were used to create a 3D model from the measurement data. To achieve the objectives of the study particular material were selected and data were collected and rough surface modeling using computational model were performed. Result of the study in terms of contact load, real area of contact, and contact pressure are extracted from each contact analysis depicted that, the lowdensity
PM rough surface leads to minimum area of contact but attains the maximum value of contact
pressure maxP and cross hardness limit earlier when compared with the low-density machined and highdensity
PM rough surface. In the PM surface model, the max PY
ratio to cross the hardness limit of 2.22
at n n P A E
of 0.0042 and in the machined surface model the max PY
ratio to cross the hardness limit of
2.22 at n n P A E
of 0.0057. The area of contact decrease whereas the mean P
and maxP
increases with a
decrease in density value. In the machined surfaces, the contact load is shared by most of the contacting
asperities and the asperity interactions restrain the asperities to remain in elastic state mostly even at high
loads relative to PM surfaces. The real contact area is low and the von mises stresses and contact pressure
are high for the low-density surface as compared to high-density surface, for the surface with ρ = 7.35g/cm3,
real contact area occurs at 0.6377mm2 or 10.2% of nominal contact area, for the surface with ρ =
7.35g/cm3, real contact area occurs at 1.14115 mm2 or 18.25% of nominal contact area.