Research of the frictional interaction of a powder coating and a metal counterbody during sliding friction

2021 ◽  
pp. 51-56
Author(s):  
Keyword(s):  
Steady State ◽  
Statistical Model ◽  
Hard Alloy ◽  
Binomial Distribution ◽  
Sliding Friction ◽  
Powder Coating ◽  
Metallographic Analysis ◽  
Wear Resistant Coatings ◽  
Frictional Interaction ◽  
Friction Surfaces

Methods of metallographic analysis and profilometry are used to study the friction surfaces of wear-resistant coatings with CоAl2O4 and CuAl2O4 modifying additives of ultradispersed spinels during sliding friction with counterbodies made of VK6 hard alloy and St6 steel. To describe the frictional interaction of a powder coating with a metal counterbody during steady-state wear, a statistical model is developed based on the binomial distribution of removed particles. Keywords: coating, counterbody, sliding friction, frictional interaction, wear, statistical modeling, binomial distribution. [email protected]

Investigation of the formation of friction surface microgeometry of a wear-resistant coating during friction with a metal counterbody

2021 ◽  
pp. 147-152
Author(s):  
N.F. Struchkov ◽  
G.G. Vinokurov ◽  
O.N. Popov
Keyword(s):  
Statistical Model ◽  
Binomial Distribution ◽  
Friction Surface ◽  
Sliding Friction ◽  
Wear Particles ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Frictional Interaction ◽  
Surface Microgeometry ◽  
Friction Surfaces

Were is researched the friction surfaces of wear-resistant coatings with modifying additives Al2O3 and metal counterbody made of ShH15 steel, and also reveals the factors that influence the formation of coating microgeometry of surface during sliding friction. A statistical model has been developed based on the binomial distribution of removed wear particles to describe the frictional interaction during friction of the coating with a metal counterbody.

Continuum Modeling and Analysis of the Frictional Interaction Between a CNT and a Substrate During Dragging

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
George G. Adams ◽  
Palaniappan Nagappan ◽  
Nicol E. McGruer
Keyword(s):  
Steady State ◽  
Partial Slip ◽  
Simple Method ◽  
Modeling And Analysis ◽  
Aspect Ratios ◽  
Atomic Force ◽  
Frictional Interaction ◽  
Potential Applications ◽  
The Relationship

A simple method to determine the frictional interaction between a carbon nanotube (CNT) and a substrate is analyzed for feasibility. In this technique an atomic force microscope (AFM) tip is used to drag a CNT along a substrate. Then the deformed shape of the CNT can be viewed either with the AFM or in a scanning electron microscope. An analysis of the steady-state deformed shape allows the determination of the frictional interactions, which occurred during dragging. It is important to quantify these interactions in a variety of potential applications of nanotechnology. In one such example, a CNT based nanoswitch consists of a CNT bridging over a trench. Actuation of the CNT causes it to stretch and can lead to partial slip at the interface. This slip causes hysteresis, which has been observed in the mechanical actuation of a CNT bridge. In this paper continuum level modeling of the frictional interaction is used to determine the relationship between the steady-state deformed shape of the CNT and the frictional interaction, which occurred between the CNT and substrate during dragging. The model and analysis indicate that this method should be feasible for CNTs with aspect ratios approximately in the 100–250 range.

Analytical Investigation of Hopf Bifurcations Occurring in a 1DOF Sliding-Friction Oscillator With Application to Disc-Brake Vibrations

2005 ◽  
Author(s):  
Hartmut Hetzler ◽  
Wolfgang Seemann ◽  
Daniel Schwarzer
Keyword(s):  
Fixed Point ◽  
Steady State ◽  
Limit Cycle ◽  
Relative Velocity ◽  
Sliding Friction ◽  
Analytical Investigation ◽  
Stable Region ◽  
Stable Steady State ◽  
Disc Brake ◽  
Stick Slip

This article deals with analytical investigations on stability and bifurcations due to declining dry friction characteristics in the sliding domain of a simple disc-brake model, which is commonly referred to as “mass-on-a-belt”-oscillator. Sliding friction is described in the sense of Coulomb as proportional to the normal force, but with a friction coefficient μS which depends on the relative velocity. For many common friction models this latter dependence on the relative velocity can be described by exponential functions. For such a characteristic the stability and bifurcation behavior is discussed. It is shown, that the system can undergo a subcritical Hopf-bifurcation from an unstable steady-state fixed point to an unstable limit cycle, which separates the basins of the stable steady-state fixed point and the self sustained stick-slip limit cycle. Therefore, only a local examination of the eigenvalues at the steady-state, as is the classical ansatz when investigating conditions for the onset of friction-induced vibrations, may not give the whole picture, since the stable region around the steady state fixed point may be rather small. The analytical results are verified by numerical simulations. Parameter values are chosen for a model which corresponds to a conventional disc-brake.

scholarly journals A statistical model to predict the steady-state creep rate

2014 ◽  
Vol 63 (2) ◽  
pp. 028101
Author(s):  
Li Jing-Tian ◽  
Wang Jian-Lu ◽  
Zhang Bang-Qiang ◽  
Rong Xi-Ming ◽  
Ning Xi-Jing
Keyword(s):  
Steady State ◽  
Creep Rate ◽  
Statistical Model ◽  
Steady State Creep ◽  
Steady State Creep Rate

scholarly journals A mechanistic model for the negative binomial distribution of single-cell mRNA counts

2019 ◽  
Author(s):  
Lisa Amrhein ◽  
Kumar Harsha ◽  
Christiane Fuchs
Keyword(s):  
Steady State ◽  
Probability Distribution ◽  
Single Cell ◽  
Negative Binomial Distribution ◽  
Binomial Distribution ◽  
Negative Binomial ◽  
Probability Distributions ◽  
Mechanistic Model ◽  
Steady State Probability ◽  
Degradation Models

SummarySeveral tools analyze the outcome of single-cell RNA-seq experiments, and they often assume a probability distribution for the observed sequencing counts. It is an open question of which is the most appropriate discrete distribution, not only in terms of model estimation, but also regarding interpretability, complexity and biological plausibility of inherent assumptions. To address the question of interpretability, we investigate mechanistic transcription and degradation models underlying commonly used discrete probability distributions. Known bottom-up approaches infer steady-state probability distributions such as Poisson or Poisson-beta distributions from different underlying transcription-degradation models. By turning this procedure upside down, we show how to infer a corresponding biological model from a given probability distribution, here the negative binomial distribution. Realistic mechanistic models underlying this distributional assumption are unknown so far. Our results indicate that the negative binomial distribution arises as steady-state distribution from a mechanistic model that produces mRNA molecules in bursts. We empirically show that it provides a convenient trade-off between computational complexity and biological simplicity.Graphical Abstract

Comparison of the Structure of AlCrSiN Coating Produced by Planar and Rotating Arc Technology

2019 ◽  
Vol 293 ◽  
pp. 141-153
Author(s):  
Justyna Galeja ◽  
Krzysztof Lukaszkowicz
Keyword(s):  
Surface Engineering ◽  
Sliding Friction ◽  
Wear Resistant Coatings ◽  
Force Microscopy ◽  
Mechanical And Tribological Properties ◽  
Atomic Force ◽  
Transmission Electron ◽  
Nitride Coatings ◽  
Arc Evaporation ◽  
The Relationship

The aim of this work was an attempt to verify two concepts of cathode modules, and the qualification of structure analysis of nitride coatings with the addition of silicon. The analysis covered one of the most commonly used in industrial conditions AlCrSiN coatings manufactured by the planar ARC and rotating (LARC®) technology, which have recently gained more and more recognition in the production of coatings by physical vapour deposition (PVD) technique. Their microstructure was examined using transmission electron microscope (TEM), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Their mechanical and tribological properties were compared in terms of their application in the field of surface engineering. Tribological tests were performed in sliding friction conditions using the ball-on-disc method, where a ceramic Al2O3 ball was used as the counterpart. Presented research results allow to determine the relationship between the structure, wear resistance, and the specific module responsible for the number, type and position of cathodes used in the constitution of the tested coatings. This study complements and contributes to the knowledge on the direct influence of the chemical composition of the coating and the method of its production on the quality and structure of the coated element for wear-resistant coatings produced by PVD in the arc evaporation method (AE).

Technology of sliding friction surface machining based on hard wear-resistant coating use taking into account technological inheritance impact

2020 ◽  
Vol 2020 (12) ◽  
pp. 31-38
Author(s):  
Tatiana Mihalenko
Keyword(s):  
Wear Resistance ◽  
Friction Surface ◽  
Sliding Friction ◽  
Quality Parameters ◽  
Surface Machining ◽  
Technological Support ◽  
Coating Application ◽  
Technological Inheritance ◽  
Theoretical Investigations ◽  
Friction Surfaces

The matters of technological support of wear-resistance for sliding friction surfaces are considered. The results of experimental theoretical investigations of modes impact of preliminary machining, coating application and sliding friction surfaces finishing upon their quality parameters are shown.

Wear tests of modified powder coatings at low climatic temperatures

2021 ◽  
pp. 442-446
Author(s):  
N.F. Struchkov ◽  
D.I. Lebedev ◽  
K.N. Bol’shev ◽  
G.G. Vinokurov
Keyword(s):  
Friction Surface ◽  
Sliding Friction ◽  
Powder Coating ◽  
Powder Coatings ◽  
Ambient Temperatures ◽  
Special Stand ◽  
Wear Tests

The results of comparative wear tests for sliding friction of modified powder coatings with metal counterbodies at room and low climatic temperatures are presented. For this, a special stand has been developed and manufactured for testing the wear of powder coatings in conditions of low climatic ambient temperatures. The temperature of the friction pairs "powder coating — metal counterbody" and the profiles of the friction surface of coatings and counterbodies were measured.

A statistical model of steady-state solvatochromism

1995 ◽  
Vol 5 (4) ◽  
pp. 321-328
Author(s):  
Olaf Roliński ◽  
Aleksander Balter
Keyword(s):  
Steady State ◽  
Statistical Model

Matrix Cracking In Brittle-Matrix Composites with Tailored Interfaces

1994 ◽  
Vol 365 ◽  
Author(s):  
Sawai Danchaivijit ◽  
L-Y. Chao ◽  
D. K. Shetfty
Keyword(s):  
Steady State ◽  
Crack Length ◽  
Uniaxial Tension ◽  
Sliding Friction ◽  
Crack Opening ◽  
State Theory ◽  
Matrix Cracking ◽  
Opening Displacement ◽  
The Matrix ◽  
Cracking Stress

ABSTRACTMatrix cracking from controlled through cracks with bridging filaments was studied in a model unidirectional composite of SiC filaments in an epoxy-bonded alumina matrix. An unbonded, frictional interface was produced by moderating the curing shrinkage of the epoxy with the alumina filler and coating the filaments with a releasing agent. Uniaxial tension test specimens (2.5 × 25 × 125 mm) with filament-bridged through cracks were fabricated by a novel two-step casting technique involving casting, precracking and joining of cracked and uncracked sections. Distinct matrix-cracking stresses, corresponding to the extension of the filamentbridged cracks, were measured in uniaxial tension tests using a high-sensitivity extensometer. The crack-length dependence of the matrix-cracking stress was found to be in good agreement with the prediction of a fracture-mechanics analysis that employed a new crack-closure force - crack-opening displacement relation in the calculation of the stress intensity for fiber-bridged cracks. The prediction was based on independent experimental measurements of the matrix fracture toughness (Kcm), the interfacial sliding friction stress (τ) and the residual stress in the matrix (σmI). The matrix-cracking stress for crack lengths (2a) greater than 3 mm was independent of the crack length and agreed with the prediction of the steady-state theory of Budiansky, Hutchinson and Evans[2]. Tests on specimens without the deliberately introduced cracks indicated a matrix-cracking stress significantly higher than the steady-state stress.

Sign in / Sign up

Export Citation Format

Share Document