Tribomechanical performance of MgO–ZnO nanoparticles as lubricating additives in the microextrusion process

The interfacial friction between tool and workpiece is unpredictable in the micromanufacturing process. It has a major influence on process workability, which determines product formability. In this study, the microtribological behavior of MgO–ZnO mixed metal oxide nanoadditive lubricant with dry friction is investigated in the microextrusion process. In the microextrusion of aluminum 6063 gear, the extrusion force reduced significantly upon using the nanoadditive lubricant. The surface roughness result shows the improved surface quality due to the existence of nanoadditives in the micromanufacturing process. The quantitative deviation due to interfacial friction is resolved with different coefficients by performing the numerical evaluation. This research contributes to the fundamental understanding about the tribological and mechanical behavior of nanoadditive lubricant in the microextrusion process and facilitates in minimizing the interfacial friction.

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Numerical Evaluation of Micro- to Macroscopic Mechanical Behavior of Carbon Black-Filled Rubber

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.274-276.19 ◽

2004 ◽

Vol 274-276 ◽

pp. 19-24 ◽

Cited By ~ 1

Author(s):

Yoshihiro Tomita ◽

Wei Lu ◽

Yasuhiro Furutani

Keyword(s):

Carbon Black ◽

Mechanical Behavior ◽

Numerical Evaluation ◽

Filled Rubber

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Influence of machining damage generated during trimming of CFRP composite on the compressive strength

Journal of Composite Materials ◽

10.1177/0021998319883335 ◽

2019 ◽

Vol 54 (11) ◽

pp. 1413-1430 ◽

Cited By ~ 6

Author(s):

N Nguyen-Dinh ◽

C Bouvet ◽

R Zitoune

Keyword(s):

Surface Roughness ◽

Mechanical Behavior ◽

Composite Structures ◽

Compressive Loading ◽

Machined Surface ◽

Reinforced Plastic ◽

Cfrp Composite ◽

Optical Topography ◽

Induced Defects ◽

Machining Damage

Machining of composite materials is a challenging task due to the heterogeneity and anisotropy of composite structures. The induced defects reduce integrity of the machined surface as well as the loading capacity of the composite structure in service. Therefore, it is necessary to quantify the damage induced during trimming and correlate the quality of the machined surface to mechanical properties. The correlation of the surface roughness criteria, widely used in literature, to the mechanical behavior raise several contradictions. For this reason, new parameters for the characterization of the machined surface are proposed and correlated to the mechanical behavior under compressive loading. In this context, carbon fiber-reinforced plastic laminates are conventionally trimmed, and the machining damage is characterized using scanning electron microscope observations, X-ray tomography, and 3D optical topography. The results reveal that crater volume and maximum depth of damage quantify the machining damage more realistic compared to the classical surface roughness criteria.

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Experimental and numerical evaluation of the damping properties of a foil bearing structure taking into account the static and kinetic dry friction

Journal of the Brazilian Society of Mechanical Sciences and Engineering ◽

10.1007/s40430-020-02720-9 ◽

2020 ◽

Vol 43 (1) ◽

Author(s):

Grzegorz Zywica ◽

Pawel Baginski ◽

Malgorzata Bogulicz

Keyword(s):

Dry Friction ◽

Numerical Evaluation ◽

Damping Properties ◽

Foil Bearing ◽

Bearing Structure

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The Influence of Surface Roughness on the Mechanism of Friction

Journal of Lubrication Technology ◽

10.1115/1.3451381 ◽

1970 ◽

Vol 92 (2) ◽

pp. 264-272 ◽

Cited By ~ 7

Author(s):

T. Tsukizoe ◽

T. Hisakado

Keyword(s):

Surface Roughness ◽

Metal Surface ◽

Coefficient Of Friction ◽

Dry Friction ◽

Metal Surfaces ◽

Roughness Effects ◽

Real Area Of Contact ◽

The Coefficient Of Friction ◽

Tangential Forces ◽

Soft Metal

A study was made of surface roughness effects on dry friction between two metals, assuming that the asperities are cones of the slopes which depend on the surface roughness. The theoretical explanations were offered for coefficients of friction of the hard cones and spheres ploughing along the soft metal surface. A comparison of calculated values based on these with experimental data shows good agreement. Moreover, theoretical discussion was carried out of surface roughness effects on dry friction between two metal surfaces on the basis of the analyses of the frictional mechanism for a hard slider on the metal surface. The theoretical estimation of the coefficient of friction between two metal surfaces can be carried out by using the relations between the surface roughness and the slopes of the asperities, and the coefficient of friction due to the adhesion at the interface. The experiments also showed that when two metal surfaces are first loaded normally and then subjected to gradually increasing tangential forces, real area of contact between them increases and the maximum tangential microslip of them increases with the increase of the surface roughness.

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