scholarly journals Calculation of Contact Pressures in Cylindrical Metal-Polymer Sliding Guides

2021 ◽  
Vol 15 (3) ◽  
pp. 30-33
Author(s):  
Myron Chernets ◽  
Mykhaylo Pashechko ◽  
Anatolii Kornienko ◽  
Anatoly Ishchenko
Keyword(s):  
Cylindrical Metal ◽  
Contact Pressures ◽  
Metal Polymer

STUDY OF WEAR RESISTANCE OF REINFORCED POLYAMIDE COMPOSITES FOR METAL-POLYMER GEAR DRIVES

Tribologia ◽  
2018 ◽  
Vol 279 (3) ◽  
pp. 19-23
Author(s):  
Myron CHERNETS ◽  
Serge SHIL'KO ◽  
Mikhail PASHECHKO
Keyword(s):  
Wear Resistance ◽  
Sliding Friction ◽  
Gear Wheel ◽  
Gear Ratio ◽  
Carbon Fibres ◽  
Gear Drive ◽  
Glass Fibres ◽  
Gear Drives ◽  
Contact Pressures ◽  
Metal Polymer

An experimental study of the wear resistance of two dispersion-filled composite materials based on polyamide used in metal-polymer gear drives with a 30% volume content of short glass or carbon fibres was performed according to the technique proposed by the authors. As a result of tribotests in the “pin-disk” scheme, the mass wear of these composites was determined under dry friction conditions for steel 45 at room temperature in the range of contact pressures of 10–40 MPa, as well as the kinetics of the coefficient of sliding friction and the contact temperature of the tribosystem elements. It was established that polyamide strengthened by carbon fibres has almost four times higher wear resistance in comparison with a polyamide filled with glass fibres. The wear resistance characteristics that are the basic parameters of the tribokinetic wear model are calculated, using the durability of the straight spur metal-polymer gear drive on the basis of the original calculation method. It was established that gear drive durability with a pinion or a wheel reinforced with carbon fibres is more than eight times the durability of gear drive with gear wheels from polyamide filled with glass fibres. The gear drive durability with the steel pinion and the composite gear wheel increases in proportion to the gear ratio as compared to the gear drive with the composite pinion and the steel wheel. The change in the maximum contact pressures in the mesh interval was calculated.

Morphological Control in Aggregates of Amphiphilic Cylindrical Metal–Polymer “Brushes”

2013 ◽  
Vol 46 (8) ◽  
pp. 3183-3189 ◽  
Author(s):  
Yiyong Mai ◽  
Lin Xiao ◽  
Adi Eisenberg
Keyword(s):  
Polymer Brushes ◽  
Morphological Control ◽  
Cylindrical Metal ◽  
Metal Polymer

Modelling of contact and tribotechnical parameters of metal–polymer gears taking into account wear and correction of teeth

2021 ◽  
pp. 135065012110546
Author(s):  
Myron Chernets ◽  
Anatolii Kornienko ◽  
Yuriy Chernets ◽  
Svetlana Fedorchuk
Keyword(s):  
Glass Fibers ◽  
Analytical Calculation ◽  
Computational Method ◽  
Linear Wear ◽  
Spur Gears ◽  
Optimal Values ◽  
Maximum Contact ◽  
Contact Pressures ◽  
Improved Methods ◽  
Metal Polymer

The estimation and the analysis of the arising contact pressures and tribotechnical parameters, that is, wear and durability, of metal-polymer spur gears using the author's computational method are presented in this study. Gears with a steel gear and pinion made of polyamide PA6 modified with dispersed carbon fibers (CF) or glass fibers (GF) whose content was 30%, PA6 + 30CF and PA6 + 30GF correspondingly, are studied. This took into account the parity of engagement, the effect of composite pinion teeth wear and gear correction. Quantitative and qualitative regularities of change of the specified parameters depending on composite type and gear correction type are established. It is found that the teeth wear of composite toothed wheels has a significant effect on reducing the values of the initial maximum contact pressures in the engagement. The distribution of linear wear along the teeth working profile and the localization of its maximum values, depending on the correction of engagement, are determined. The minimum durability of metal–polymer gears is calculated by simplified and improved methods. The optimal values of the correction coefficients at which the minimum durability is highest for both combination types of metal–polymer gears with height and angular teeth correction are established. The durability of metal–polymer gears with a driving pinion made of PA6 + 30CF composite calculated with the improved method is about seven times higher than the pinion made of PA6 + 30GF composite. In contrast to the methods of calculation of metal gears known from publications, the method presented in this study takes into account such practically significant factors as change of radii of tooth profile curvature owing to wear, their correction and number of teeth pairs at the engagement. In metal–polymer gears, there are no analytical calculation methods for modelling wear and tribological durability compared with that of the author's method.

scholarly journals Prediction of the contact pressures and resource of metal-polymer linear cylindrical plain bearings

2021 ◽  
Vol 49 (3) ◽  
pp. 627-633
Author(s):  
M. Chernets ◽  
A. Kornienko ◽  
O. Radko ◽  
A. Radionenko
Keyword(s):  
Service Life ◽  
Sliding Friction ◽  
Theory Of Elasticity ◽  
Computational Method ◽  
Radial Clearance ◽  
Initial Contact ◽  
Base Diameter ◽  
Different Types ◽  
Contact Pressures ◽  
Metal Polymer

Different types of linear bearings (guides) are widely used in practice in various equipment, as in many other areas of human activity. In particular, this applies to cylindrical guides (linear plain bearings) of reciprocating motion. However, despite their considerable distribution, in fact, there are no reasonable methods for calculating the wear and service life of not only metal but also metal-polymer linear bearings. According to the author's method, the influence of load, base diameter and radial clearance on the maximum initial pressures in this bearing was investigated within the plane contact problem of the theory of elasticity. Further, using the computational method according to the author's tribokinetic model of wear during sliding friction, the effect of the composite bushing wear on the change of the initial contact characteristics (contact pressures and contact angle) was evaluated. The forecast calculation of the service life of the bearing depending on the above factors is also carried out. Quantitative and qualitative regularities of dependence of contact pressures and a resource on the accepted factors are established.

scholarly journals Influence of Temperature on Contact Pressures and Resource of Metal-Polymer Plain Bearings with the Filled Polyamide PA6 Bushing

2021 ◽  
Author(s):  
Myron Chernets ◽  
Mykhaylo Pashechko ◽  
Anatolii Kornienko ◽  
Andrei Buketov
Keyword(s):  
Young’S Modulus ◽  
Dry Friction ◽  
Young's Modulus ◽  
Effect Of Temperature ◽  
Influence Of Temperature On ◽  
Practical Effect ◽  
Design Calculations ◽  
Increasing Temperature ◽  
Contact Pressures ◽  
Metal Polymer

It is known that the elastic characteristics of polyamides change with increasing temperature, in particular, the Young's modulus decreases significantly. This fact is practically not taken into account in design calculations of metal-polymer plain (MP) bearings, operating under conditions of the boundary and dry friction. The purpose of the study is the analysis of the effect of temperature on the change of the Young's modulus and, accordingly, the contact strength and triboresource according to the developed method of calculating MP bearings. MP bearings with a bushing made of polyamide PA6 reinforced with glass or carbon dispersed fibers were investi-gated. Quantitative and qualitative regularities of change of the maximum contact pressures and resource of the bearings at temperature increase under conditions of boundary and dry friction are established. The pressures in the bearing bushing made of PA6+30GF will be lower than for the bushing made of PA6+30CF. The resource of the bushing made of PA6+30CF will be significantly greater than for PA6+30GF. For thermoplastic polymers, the increase in temperature will have a useful practical effect due to the decrease in the rigidity of the polymer composites of the bearing bushing.

Maximum Interlabial Pressures in Normal Speakers

1997 ◽  
Vol 40 (2) ◽  
pp. 400-404 ◽  
Author(s):  
Virginia A. Hinton ◽  
Winston M. C. Arokiasamy
Keyword(s):  
Speech Production ◽  
Contact Pressure ◽  
Direct Evidence ◽  
Unit Area ◽  
Jaw Movement ◽  
Contractile Forces ◽  
Contact Pressures ◽  
Muscle Contractile

It has been hypothesized that typical speech movements do not involve large muscular forces and that normal speakers use less than 20% of the maximum orofacial muscle contractile forces that are available (e.g., Amerman, 1993; Barlow & Abbs, 1984; Barlow & Netsell, 1986; DePaul & Brooks, 1993). However, no direct evidence for this hypothesis has been provided. This study investigated the percentage of maximum interlabial contact pressures (force per unit area) typically used during speech production. The primary conclusion of this study is that normal speakers typically use less than 20% of the available interlabial contact pressure, whether or not the jaw contributes to bilabial closure. Production of the phone [p] at conversational rate and intensity generated an average of 10.56% of maximum available interlabial pressure (MILP) when jaw movement was not restricted and 14.62% when jaw movement was eliminated.

CHEMISTRY AND MICROSTRUCTURE AT METAL-POLYMER INTERFACES

1988 ◽  
Vol 49 (C5) ◽  
pp. C5-49-C5-59 ◽  
Author(s):  
P. S. HO ◽  
R. HAIGHT ◽  
R. C. WHITE ◽  
B. D. SILVERMAN
Keyword(s):  
Polymer Interfaces ◽  
Metal Polymer
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