Micro-slippage effects in pre-rolling induced by a disturbed and undisturbed pendulum with spherical supports

Gilavdary, I. Z.; Mekid, Samir; Riznookaya, N. N.

doi:10.1177/1350650113498230

Cited by 8 publications

(5 citation statements)

References 11 publications

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“…[4][5][6][7] to the experimental studies of the parameters of contact interactions of elastic bodies with the aid of a pendulum tribometer. The results of these valuable studies have stimulated the emergence of the present paper.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Hysteresis losses in oscillatory systems

Izmailov

Karagioz

Shakhparonov

2015

International Journal of Non-Linear Mechanics

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Section: Discussionmentioning

confidence: 99%

“…In [4][5][6][7] it has been shown that a pendulum tribometer at small swinging amplitudes allows for determination of the physical parameters of the materials under study without destroying their surface. The main attention is paid to measuring the coefficient of rolling friction f r .…”

Section: Introductionmentioning

confidence: 99%

Hysteresis losses in oscillatory systems

Izmailov

Karagioz

Shakhparonov

2015

International Journal of Non-Linear Mechanics

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“…No slippage was noticed between materials at the interface of contact according to the recorded graphs due to the highly stable pendulum as discussed previously. This was possible with the appropriate design of the pendulum for pure rolling as it was mentioned previously [25,26].…”

Section: Pre-rolling Under Dry Conditions 41 Determination Of Pre-rol...mentioning

confidence: 98%

Measurement of extremely low pre-rolling resistance in dry and lubricating conditions

Gilavdary¹,

Mekid²,

Riznoukaya³

2020

Surf. Topogr.: Metrol. Prop.

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This paper aims to experimentally determine the pre-rolling resistance coefficient based on a theoretical model for various contact material interfaces e.g. Al 2 O 3 and silica balls on aluminum nanometer coated and non-coated single crystal Si wafers. The pre-rolling is the initial transient phase before complete rolling. This is of great interest to many applications e.g. nano-positioning using rolling actuators. The experiments are carried out using a precision designed pendulum securing pure pre-rolling without any external effect nor any slippage that may occur at the contact patch. With a design objective to quantify and minimize this resistance, the experiments under the conditions described in this paper, have revealed for the first time, extremely low values of pre-rolling resistance coefficients in the order of 10 −7 for various combinations of materials depending on the interface of contact and type of material. The experimental results have shown that as the surface roughness increases the time of the pendulum oscillation decreases, and hence the coefficient of pre-rolling friction increases. The lubrication of the contact has exhibited a slight effect showing little decrease of the pre-rolling friction coefficient by 30% in average under similar conditions and less than 5% decrease of the oscillations period of the pendulum.

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“…Ранее авторами данной работы был разработан двухконтактный маятниковый прибор, в котором физический маятник совершал свободные затухающие качания с амплитудой, существенно меньшей угла упругого контакта, опираясь двумя одинаковыми шариками на плоскую исследуемую поверхность. Центр масс маятника находился на пятне контактов шариков [23,24].…”

Section: маятниковые приборы для исследования сил адгезииunclassified

Device and Measuring Method the Moments of Rolling Resistance Forces on the Contact Spot

Dzhilavdari

Mekid

Ризноокая

2019

Prib. metody izmer.

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Currently, the study of rolling friction is one of the main directions in the study of the laws of contact interaction of solids. The complexity of solving the problems existing in this area is evidenced by the practically vast number of publications, the list of which is constantly growing.In this paper, attention is paid to studies of the moments of rolling resistance at displacements from the equilibrium position of a ball-shaped body that are substantially smaller than the size of the contact spot. The purpose of the present work is to describe the design of the single-contact pendulum device developed by the authors, in which the physical pendulum, resting on the flat surface of the body under study with only one ball, makes free small stable swings in a vertical plane, as well as in the description of a special measurement technique with high sensitivity and accuracy rolling resistance forces, including adhesion forces and frequency-independent forces of elastic deformations. It is assumed that the adhesion forces can exhibit both dissipative properties and elastic properties, while elastic forces are independent of the strain rate.The originality of the method of measuring rolling resistance in this paper consists in using the method of nonlinear approximation of the dependence of the amplitude and period of swing of the pendulum on time. The approximation is carried out on the basis of the proposed laws of amplitude decay and period variation, which differ from the usual exponential law.It is assumed that this approach allows one to evaluate the surface tension of a solid and evaluate the pressure of adhesion forces between the surfaces of the contacting bodies, as well as to establish an analytical form of the moment of rolling resistance. The curves of the dependence of the rolling resistance moment on the swing amplitude of the pendulum are constructed. Experiments were performed for the following pairs of contacting bodies: steel-steel, steel-glass, steel-electritechnical silicon. It was assumed that the pressure at the contact spot did not exceed the elastic limit.The developed single-ball pendulum device and the proposed measurement procedure open up new wide possibilities for studying the laws of mechanisms of rolling resistance under conditions of microand mesoscale displacements of a rolling body from a state of rest.

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Micro-slippage effects in pre-rolling induced by a disturbed and undisturbed pendulum with spherical supports

Cited by 8 publications

References 11 publications

Hysteresis losses in oscillatory systems

Hysteresis losses in oscillatory systems

Measurement of extremely low pre-rolling resistance in dry and lubricating conditions

Device and Measuring Method the Moments of Rolling Resistance Forces on the Contact Spot

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