Contact Area and Shear Stress in Repeated Single-Asperity Sliding of Steel on Polymer

Pei, Xianqiang; Lin, Leyu; Schlarb, Alois K.; Bennewitz, Roland

doi:10.1007/s11249-019-1146-y

Cited by 14 publications

(3 citation statements)

References 28 publications

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“…Значення максимальної частки наповнювачаφ m можна розрахувати для частинок правильної форми або експериментально визначити для будь-яких частинок, більших за 40 мкм [6]:…”

Section: таблиця 1 площа поверхні кварцового піску з кубічною формою ...unclassified

Modelling the Structural Parameters of the Glue Composition and Studying Its Adhesive Strength

Zolotov,

Pustovoitova,

Kamchatna

et al. 2024

MEC

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The study considers a model of a filled polymer system to analyse the interaction and relationship between its components and adhesive properties. A two-phase system occurs in the filler composition, which forms a layer at the interface with properties different from the bulk properties of the filler and the binder. The system consists of a filler, a boundary layer, and a binder, with their properties accounted for with the accuracy of the manufacturing conditions and the dimensions of the sample. We found that the filler grains shape significantly affects the properties of the system, such as bond strength and water resistance. Distance analysis between filler particles showed that a decrease in its volume fraction in the composition leads to an increased distance between them. We can draw the most objective conclusions after processing the filler particles since, in this case, everything depends on the change of interactions at the boundary (the properties of the matrix in the volume practically do not change). In other cases (for example, in the case of changing the temperature and time conditions of preparation and testing), not only the surface but also the volume properties of the matrix change, and, accordingly, it is usually impossible to conclude the role of adhesion. Its processes are part of the adhesion strength of the adhesive material, so the adhesion strength (also called interfacial strength, boundary strength, and bond strength) has been the subject of constant research for several decades. Adhesion strength is a quantitative indicator of adhesion, i.e., a quantitative indicator of the adhesion forces between the polymer matrix and the dispersed filler as a substrate. While the wetting angle of the edge characterises the process of formation of an adhesive bond, the strength of adhesion characterises the process of its destruction. Knowing the limits of the ‘ideal’ adhesion region can answer the question of what limits to aim for to improve adhesion, but this requires practical measurement of the interfacial strength between the acrylic composition and the filler, which is challenging. As a result, the strength of the composite can be a monotonically increasing function of the adhesion strength, but only in a limited range of values. An increase in adhesion can lead to a decrease in the strength of the adhesive material, depending on the size of the filler particles and the volume fraction of the filler. Adhesion strength is a quantitative indicator of the adhesion strength between the polymer matrix and the dispersed filler. The strength of adhesion affects the strength of the composite material. The ideal adhesion strength depends on the size and volume fraction of the filler. Excessive adhesion strength can lead to a decrease in the strength of the adhesive material. Keywords: polymer-mineral composition, adhesion, cohesion, acrylic glue.

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Section: таблиця 1 площа поверхні кварцового піску з кубічною формою ...unclassified

Modelling the Structural Parameters of the Glue Composition and Studying Its Adhesive Strength

Zolotov,

Pustovoitova,

Kamchatna

et al. 2024

MEC

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“…Typically, the surfaces of cotton fabrics are rough because of cross fibers. The real contact behavior of fibers involves the evolution of the contact area between the asperities of two surfaces, which influences the tribological characteristics, including friction force, friction coefficient, and surface properties [7,[22][23][24][25]. Hosseinali and Thomasson [7] found that dimensional properties influence the friction coefficient of a single fiber.…”

Section: Introductionmentioning

confidence: 99%

Relationship between the real contact behavior and tribological characteristics of cotton fabric

Chen

Zhang

et al. 2020

Friction

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The tribological characteristics of cotton fibers play an important role in engineering and materials science, and real contact behavior is a significant aspect in the friction behavior of cotton fibers. In this study, the tribological characteristics of cotton fibers and their relationship with the real contact behavior are investigated through reciprocating linear tribotesting and real contact analysis. Results show that the friction coefficient decreases with a general increase in load or velocity, and the load and velocity exhibit a co-influence on the friction coefficient. The dynamic change in the real contact area is recorded clearly during the experiments and corresponds to the fluctuations observed in the friction coefficient. Moreover, the friction coefficient is positively correlated with the real contact area based on a quantitative analysis of the evolution of friction behavior and the real contact area at different loads and velocities. This correlation is evident at low velocities and medium load.

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“…Several methods were generally used to study this process, including the experimental approach and the theoretical approach. Some experimental works, which studied the sliding of the single asperity in the micro scale, were accomplished with apparatuses such as the atomic force microscope [6,7] or the scratch tester in micro or nano scale [8,9]. These studies have high requirements for experimental equipment, thus, many other researchers selected the theoretical way, such as the analytical method and the numerical method.…”

Section: Introductionmentioning

confidence: 99%

Sliding Interaction for Coated Asperity with Power-Law Hardening Elastic-Plastic Coatings

Zhao

2019

Materials

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Sliding between asperities occurs inevitably in the friction pair, which affects the efficiency and reliability in both lubricated and non-lubricated conditions. In this work, the contact parameters in the coated asperity sliding process are studied, and the universal expressions of the average contact force and the friction coefficient are obtained. The effect of the interference between asperities, the material and geometrical parameters including the Young’s modulus ratio and yield strength ratio of the coating and substrate, and the hardening exponent and thickness of the coating on the average contact forces and friction coefficient is considered. It shows both normal and tangential contact forces increase with the increasing interference, increasing Young’s modulus ratio, decreasing yield strength ratio, and decreasing coating thickness; while the trend is different for the effect of the hardening exponent of the coating. The normal force increases and the tangential force decreases as the hardening exponent increases. Based on this, the influence of these parameters on the effective friction coefficient is obtained further. It reveals that the friction coefficient increases as the interference and Young’s modulus ratio enlarge and decreases as the yield strength ratio, the coating’s hardening exponent, and thickness increase. The universal expressions for the contact force and friction coefficient in the sliding process are obtained. This work might give some useful results to help choose the optimum coatings for specific substrates to reduce friction in cases where the asperity contact exists, especially in the focused field of the journal bearing in the marine engine under poor lubrication conditions.

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Contact Area and Shear Stress in Repeated Single-Asperity Sliding of Steel on Polymer

Cited by 14 publications

References 28 publications

Modelling the Structural Parameters of the Glue Composition and Studying Its Adhesive Strength

Modelling the Structural Parameters of the Glue Composition and Studying Its Adhesive Strength

Relationship between the real contact behavior and tribological characteristics of cotton fabric

Sliding Interaction for Coated Asperity with Power-Law Hardening Elastic-Plastic Coatings

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