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Artigos de revistas sobre o tema "Interfacial asperities"

Autor: Grafiati

Publicado: 7 de setembro de 2024

Última modificação: 19 de julho de 2025

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1

Yuan-hao, Xing, Li Chi, Li Shuan-hu, and Gao Yu. "Revealing asperity-controlled failure patterns in landslides: A case study of Hushuo Expressway, Inner Mongolia." PLOS One 20, no. 5 (2025): e0323903. https://doi.org/10.1371/journal.pone.0323903.

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This study systematically investigates the failure mechanism of interfacial landslides through experimental validation and engineering applications of interfacial asperity theory. An innovative scaled physical modeling approach was developed, incorporating artificially prefabricated asperities along the sliding interface. Using 3D laser scanning to monitor slope deformation, the physical experiments provide the first direct evidence linking asperity rupture to landslide initiation. The interfacial asperity theory proves particularly effective in analyzing the three recurrent landslides along t

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2

Han, Yujin, Pierre-Marie Thebault, Corentin Audes, et al. "Temperature and chemical effects on the interfacial energy between a Ga–In–Sn eutectic liquid alloy and nanoscopic asperities." Beilstein Journal of Nanotechnology 13 (August 23, 2022): 817–27. http://dx.doi.org/10.3762/bjnano.13.72.

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The interfacial energies between a eutectic Ga–In–Sn liquid alloy and single nanoscopic asperities of SiOx, Au, and PtSi have been determined in the temperature range between room temperature and 90 °C by atomic force spectroscopy. For all asperities used here, we find that the interfacial tension of the eutectic Ga–In–Sn liquid alloy is smaller than its free surface energy by a factor of two (for SiOx) to eight (for PtSi). Any significant oxide growth upon heating studied was not detected here, and the measured interfacial energies strongly depend on the chemistry of the asperities. We also o

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3

Wiertlewski, Michaël, Rebecca Fenton Friesen, and J. Edward Colgate. "Partial squeeze film levitation modulates fingertip friction." Proceedings of the National Academy of Sciences 113, no. 33 (2016): 9210–15. http://dx.doi.org/10.1073/pnas.1603908113.

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When touched, a glass plate excited with ultrasonic transverse waves feels notably more slippery than it does at rest. To study this phenomenon, we use frustrated total internal reflection to image the asperities of the skin that are in intimate contact with a glass plate. We observed that the load at the interface is shared between the elastic compression of the asperities of the skin and a squeeze film of air. Stroboscopic investigation reveals that the time evolution of the interfacial gap is partially out of phase with the plate vibration. Taken together, these results suggest that the ski

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4

Wu, Chu Han, Liang Chi Zhang, Shan Qing Li, Zheng Lian Jiang, and Pei Lei Qu. "Effect of Asperity Plastic Deformation on the Interface Friction in Metal Forming." Key Engineering Materials 626 (August 2014): 222–27. http://dx.doi.org/10.4028/www.scientific.net/kem.626.222.

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This paper investigates the effect of the plastic deformation of surface asperities on the interface friction in metal forming involving multi-scale deformation with random surface topography. The equivalent interfacial layer (EIL) introduced by the authors previously was used to integrate the Reynolds equation with the plastic deformation of the randomly distributed surface asperities. The contributions of solid-lubricant interaction, lubricant viscosity and microscopic deformation were therefore included efficiently in a conventional macroscopic finite element analysis. The merit of the meth

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5

Komvopoulos, K., and D. H. Choi. "Elastic Finite Element Analysis of Multi-Asperity Contacts." Journal of Tribology 114, no. 4 (1992): 823–31. http://dx.doi.org/10.1115/1.2920955.

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The plane-strain contact problem of an elastic half-space indented by a nominally flat rigid surface having a finite number of regularly spaced cylindrical asperities is investigated using the finite element method to gain an understanding of the interactions in multi-asperity contacts. The significance of the number and spacing of asperities on the contact behavior at the center and edges of the interfacial region is examined. Subsurface stress fields of multi-asperity contacts are presented for various asperity distributions and indentation depths. Asperity interaction effects are quantified

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6

Komvopoulos, K., N. Saka, and N. P. Suh. "The Mechanism of Friction in Boundary Lubrication." Journal of Tribology 107, no. 4 (1985): 452–62. http://dx.doi.org/10.1115/1.3261108.

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The primary friction mechanism between boundary-lubricated sliding surfaces was investigated. Experiments were performed on well-polished aluminum, copper, and chromium using mineral oil lubricant. It was found that the prevailing boundary lubrication model, which is based on the adhesion between asperities and shearing of the lubricant film, cannot account for the formation of plowing grooves on polished surfaces. Scanning electron micrographs of the worn surfaces and surface profiles have shown that plowing is the dominant mechanism of friction in boundary lubrication. Theoretical analysis h

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7

Komvopoulos, K., and W. Yan. "Three-Dimensional Elastic-Plastic Fractal Analysis of Surface Adhesion in Microelectromechanical Systems." Journal of Tribology 120, no. 4 (1998): 808–13. http://dx.doi.org/10.1115/1.2833783.

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High adhesion is often encountered at contact interfaces of miniaturized devices, known as microelectromechanical systems, due to the development of capillary, electrostatic, and van der Waals attractive forces. In addition, deformation of contacting asperities on opposing surfaces produces a repulsive interfacial force. Permanent surface adhesion (referred to as stiction) occurs when the total interfacial force is attractive and exceeds the micromachine restoring force. In the present study, a three-dimensional fractal topography description is incorporated into an elastic-plastic contact mec

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8

Komvopoulos, K., N. Saka, and N. P. Suh. "Plowing Friction in Dry and Lubricated Metal Sliding." Journal of Tribology 108, no. 3 (1986): 301–12. http://dx.doi.org/10.1115/1.3261181.

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Experimental evidence for plowing under dry and lubricated sliding conditions is presented and analytical expressions for the coefficient of friction due to plowing are obtained. The theoretical friction coefficient was found to be a function of the sharpness of the hard asperities, the interfacial “friction” conditions and the shape of the plastic zone. The agreement between theoretical and experimental friction coefficients from lubricated sliding and cutting experiments was remarkably good. The discrepancy between theory and experiment in the case of dry sliding between like metals was show

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9

Takahashi, Yasuo, Terumi Nakamura, Yoshihiro Asakura, and Masakatsu Maeda. "Influence of surface asperities on interfacial extension during solid state pressure welding." IOP Conference Series: Materials Science and Engineering 61 (August 1, 2014): 012001. http://dx.doi.org/10.1088/1757-899x/61/1/012001.

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10

Maciejewski, Jan, Sebastian Bąk, and Paweł Ciężkowski. "Modelling of Rock Joints Interface under Cyclic Loading." Studia Geotechnica et Mechanica 42, no. 1 (2020): 36–47. http://dx.doi.org/10.2478/sgem-2019-0030.

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AbstractThe problem of numerical simulation of the material interface response under monotonic and cyclic loading is of fundamental scientific and engineering importance. In fact, such interfaces occur in most engineering and geotechnical structures. The present work is devoted to the deformational response analysis of contact interfaces under monotonic and cyclic loads. The class of materials includes rock and structural joints, soil structure interfaces, masonry and cementitious joints, localized shear bands and so on.The aim of the proposed model is to simulate the cyclic shear test under c

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11

De Meyere, Robin M. G., Kay Song, Louise Gale, et al. "A novel trench fibre push-out method to evaluate interfacial failure in long fibre composites." Journal of Materials Research 36, no. 11 (2021): 2305–14. http://dx.doi.org/10.1557/s43578-021-00153-1.

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AbstractTraditional fibre push-outs for the evaluation of interfacial properties in long fibre ceramic matrix composites present their limitations—solutions for which are addressed in this work by introducing the novel trench push-out test. The trench push-out makes use of a FIB milling system and an SEM in-situ nanoindenter to probe a fibre pushed into a trench underneath, allowing in-situ observations to be directly correlated with micromechanical events. SiCf/BN/SiC composites—candidate material for turbine engines—were used as model materials in this work. Different fibre types (Hi-Nicalon

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12

Takahashi, Y., and M. Tanimoto. "Experimental Study of Interfacial Contacting Process Controlled by Power Law Creep." Journal of Engineering Materials and Technology 117, no. 3 (1995): 336–40. http://dx.doi.org/10.1115/1.2804548.

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Interfacial contacting processes under a high temperature and a high bonding pressure (T = 973 K, P = 30 MPa) are experimentally studied, using oxygen free copper. The faying surfaces were machined by lathe, resulting in controlled regular surface asperities. The asperity angle of surface ridges was changed from 10 to 60 deg. The change in the interfacial deformation mode with the asperity angle has been investigated. Results show the interfacial contact process is strongly influenced by the asperity angle (shape of surface ridge). The bonding tests were carried out in high vacuum atmosphere (

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13

Khosravizadeh, Negar, Duowei Lu, Yichen Liao, Baoqiang Liao, and Pedram Fatehi. "Simulation and Experimental Analysis of Microalgae and Membrane Surface Interaction." Colloids and Interfaces 7, no. 1 (2023): 24. http://dx.doi.org/10.3390/colloids7010024.

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The microalgae-induced membrane system applied in wastewater treatment has attracted attention due to microalgae’s outstanding nutrient fixation capacity and biomass harvesting. However, the fundamental understanding of the interaction of microalgae and membrane surfaces is still limited. This study presents experimental and numerical methods to analyze the attachment of microalgae to the membrane. An atomic force microscope (AFM) analysis confirmed that a polydimethylsiloxane (PDMS) sensor, as a simulated membrane surface, exhibited a rougher surface morphology than a polyurethane (PU) sensor

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14

Danyluk, Steven, and Sum Huan Ng. "Mechanical Mechanisms of Chemical Mechanical Polishing." Advanced Materials Research 47-50 (June 2008): 1486–89. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.1486.

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This paper describes a mechanical mechanism of chemical mechanical polishing (CMP) and the model is applied to the polishing of silicon substrates by polyurethane pads and slurries containing fumed silica as is typically done in the manufacture of integrated circuits. The model utilizes the concept that the polishing pad surface contains asperities that support the normal load on the wafer, and that friction and hydrodynamic forces influence wear. The interfacial fluid pressure can significantly influence the normal pressures on the wafers and its effects modify the wear rate predictions.

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15

Weber, B., T. Suhina, A. M. Brouwer, and D. Bonn. "Frictional weakening of slip interfaces." Science Advances 5, no. 4 (2019): eaav7603. http://dx.doi.org/10.1126/sciadv.aav7603.

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When two objects are in contact, the force necessary to overcome friction is larger than the force necessary to keep sliding motion going. This difference between static and dynamic friction is usually attributed to the growth of the area of real contact between rough surfaces in time when the system is at rest. We directly measure the area of real contact and show that it actually increases during macroscopic slip, despite the fact that dynamic friction is smaller than static friction. This signals a decrease in the interfacial shear strength, the friction per unit contact area, which is due

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16

Levert, Joseph A., Steven Danyluk, and John Tichy. "Mechanism for Subambient Interfacial Pressures While Polishing With Liquids." Journal of Tribology 122, no. 2 (1999): 450–57. http://dx.doi.org/10.1115/1.555381.

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This paper reports the results of a model for predicting the development of subambient pressures during the polishing of flat hard substrates by sliding against a compliant pad in the presence of a slurry (liquid). This work is an extension of our prior experimental work on the polishing of single crystal silicon wafers with polyurethane pads and high pH slurries containing silica particles. Subambient pressures have important implications in the polishing rate and uniformity of silicon and, therefore, in the manufacture of large-scale integrated circuits. The subambient pressure is the result

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17

Roberts, A. D. "A Guide to Estimating the Friction of Rubber." Rubber Chemistry and Technology 65, no. 3 (1992): 673–86. http://dx.doi.org/10.5254/1.3538633.

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Abstract Vulcanized rubber, as a material, can exhibit extremes in friction level when utilized in all manner of mechanical devices. There is no single value of friction coefficient for a particular vulcanizate. Guidelines for estimating the friction of a rubber component can be based on the idea that the friction force will depend upon the real area of contact that the component makes with its counter-surface. That depends upon such factors as vulcanizate hardness, viscoelastic response, shape, and surface finish. The latter can influence hysteresis losses, as can asperities on the counter-su

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18

Suh, Allison Y., Sung-Chang Lee, and Andreas A. Polycarpou. "Design Optimization of Ultra-Low Flying Head-Disk Interfaces Using an Improved Elastic-Plastic Rough Surface Model." Journal of Tribology 128, no. 4 (2006): 801–10. http://dx.doi.org/10.1115/1.2345399.

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Sub-5nm flying head-disk interfaces (HDIs) designed to attain extremely high areal recording densities of the order of Tbit∕in2 are susceptible to strong adhesive forces, which can lead to subsequent contact, bouncing vibration, and high friction. Accurate prediction of the relevant interfacial forces can help ensure successful implementation of ultra-low flying HDIs. In this study, an improved rough surface model is developed to estimate the adhesive, contact, and friction forces as well as the mean contact pressure relevant to sub-5nm HDIs. The improved model was applied to four different HD

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19

Balokhonov, Ruslan, Varvara Romanova, Eugen Schwab, Aleksandr Zemlianov, and Eugene Evtushenko. "COMPUTATIONAL MICROSTRUCTURE-BASED ANALYSIS OF RESIDUAL STRESS EVOLUTION IN METAL-MATRIX COMPOSITE MATERIALS DURING THERMOMECHANICAL LOADING." Facta Universitatis, Series: Mechanical Engineering 19, no. 2 (2021): 241. http://dx.doi.org/10.22190/fume201228011b.

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A technique for computer simulation of three-dimensional structures of materials with reinforcing particles of complex irregular shapes observed in the experiments is proposed, which assumes scale invariance of the natural mechanical fragmentation. Two-phase structures of metal-matrix composites and coatings of different spatial scales are created, with the particles randomly distributed over the matrix and coating computational domains. Using the titanium carbide reinforcing particle embedded into the aluminum as an example, plastic strain localization and residual stress formation along the

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20

Soós, Eniko, and Tibor Goda. "Numerical Analysis of Sliding Friction Behaviour of Rubber." Materials Science Forum 537-538 (February 2007): 615–22. http://dx.doi.org/10.4028/www.scientific.net/msf.537-538.615.

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A study has been made of asperity interaction of unlubricated steel/rubber sliding pair. The aim is to study the effect of the internal friction (hysteresis) of rubber on the friction force. In the two-dimensional finite element analysis, asperities are modeled by cylinders and both the interfacial adhesion and the friction at steel-rubber interface are neglected. Rate-dependent material behavior of rubber is described, as a first approximation, by a three-parameter Zener-model. It is found that the viscoelastic properties of rubber have a strong influence on the hysteresis component of fricti

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21

Bidulsky, Robert, Jana Bidulská, Tibor Kvačkaj, and Marco Actis Grande. "Case study of advanced processed OFHC copper by dry sliding wear test." Acta Metallurgica Slovaca 29, no. 1 (2023): 34–38. http://dx.doi.org/10.36547/ams.29.1.1734.

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The wear behaviour of copper material processed by ECAP (Equal Channel Angular Pressing) and orbital forging (OF) is presented in this study. Dry sliding wear tests were carried out for the wear behaviour of the investigated system. Oxygen-free high thermal conductivity (OFHC) copper was used for testing. The new combination of metal forming processes was used because of ease of fabrication. Additionally, wear rate, friction coefficient and wears mechanisms were observed. The friction resistance is caused by the destruction of the adhesion between surface asperities in metal friction. Moreover

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22

Jeng, Yeau-Ren, and Pay-Yau Huang. "A Material Removal Rate Model Considering Interfacial Micro-Contact Wear Behavior for Chemical Mechanical Polishing." Journal of Tribology 127, no. 1 (2005): 190–97. http://dx.doi.org/10.1115/1.1828068.

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Chemical Mechanical Polishing (CMP) is a highly effective technique for planarizing wafer surfaces. Consequently, considerable research has been conducted into its associated material removal mechanisms. The present study proposes a CMP material removal rate model based upon a micro-contact model which considers the effects of the abrasive particles located between the polishing interfaces, thereby the down force applied on the wafer is carried both by the deformation of the polishing pad asperities and by the penetration of the abrasive particles. It is shown that the current theoretical resu

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23

Zhang, Yi, Wei Wang, Kun Liu, Baohong Tong, Zhaowen Hu, and Ruhong Song. "Thermomechanical analysis on the frictional contact behavior of a high-strength steel 22MnB5–die steel H13 tribopair at 800 °C by experiment and finite-element simulation." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 235, no. 9 (2021): 1958–73. http://dx.doi.org/10.1177/1350650120980868.

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High-strength boron steels are widely used in manufacturing the auto bodies and parts of light-weight vehicles, but the high rates of surface scratches and die wear have consistently occurred during hot stamping for these steels. For an in-depth understanding of the tribological characteristics at this interface, the frictional contact behavior and thermomechanical mechanisms of boron steel 22MnB5 against die steel H13 at 800 °C were studied through experiments and finite-element simulations. The coefficient of friction and worn surface topography were investigated by pin-on-disk sliding tests

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24

Zhu, Shengguang, and Liyong Ni. "Calculation and AFM Experimental Research on Slip Friction for Unlubricated Spherical Contact with Roughness Effect." Micromachines 12, no. 11 (2021): 1428. http://dx.doi.org/10.3390/mi12111428.

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Previous research on friction calculation models has mainly focused on static friction, whereas sliding friction calculation models are rarely reported. In this paper, a novel sliding friction model for realizing a dry spherical flat contact with a roughness effect at the micro/nano scale is proposed. This model yields the sliding friction by the change in the periodic substrate potential, adopts the basic assumptions of the Greenwood–Williamson random contact model about asperities, and assumes that the contact area between a rigid sphere and a nominal rough flat satisfies the condition of in

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25

Cochard, A., L. Bureau, and T. Baumberger. "Stabilization of Frictional Sliding by Normal Load Modulation." Journal of Applied Mechanics 70, no. 2 (2003): 220–26. http://dx.doi.org/10.1115/1.1546241.

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This paper presents the stability analysis of a system sliding at low velocities (<100 μm⋅s−1) under a periodically modulated normal load, preserving interfacial contact. Experiments clearly evidence that normal vibrations generally stabilize the system against stick-slip oscillations, at least for a modulation frequency much larger than the stick-slip one. The mechanical model of L. Bureau, T. Baumberger, and C. Caroli validated on the steady-state response of the system, is used to map its stability diagram. The model takes explicitly into account the finite shear stiffness of the load-be

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Wang, R. Z., Z. Suo, A. G. Evans, N. Yao, and I. A. Aksay. "Deformation mechanisms in nacre." Journal of Materials Research 16, no. 9 (2001): 2485–93. http://dx.doi.org/10.1557/jmr.2001.0340.

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Nacre (mother-of-pearl) from mollusc shells is a biologically formed lamellar ceramic. The inelastic deformation of this material has been experimentally examined, with a focus on understanding the underlying mechanisms. Slip along the lamellae tablet interface has been ascertained by testing in compression with the boundaries oriented at 45° to the loading axis. The steady-state shear resistance τss has been determined and inelastic strain shown to be as high as 8%. The inelastic deformation was realized by massive interlamellae shearing. Testing in tension parallel to the tablets indicates i

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Patitsas, A. J. "Squeal vibrations, glass sounds, and the stick-slip effect." Canadian Journal of Physics 88, no. 11 (2010): 863–76. http://dx.doi.org/10.1139/p10-077.

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The origin of the squeal acoustic emissions when a chalk is rubbed on a blackboard or better on a ceramic plate, and those when a wet finger is rubbed on a smooth surface, such as a glass surface, is sought in the stick-slip effect between the rubbing surfaces. In the case of the squealing chalk, the stick-slip effect is anchored by shear modes of vibration in about a 0.3 mm thick chalk powder band at the rubbing interface, while in the case of the wet finger on glass, by such modes in a band comprising the finger skin. Furthermore, there are the interfacial bands at the contact areas that res

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Arroyave, M., W. Perez, J. Quintero, S. Casanova, and A. Devia. "Mechanical Measurements of Multilayer Thin Films Obtained by a PAPVD System." Microscopy and Microanalysis 11, S03 (2005): 138–41. http://dx.doi.org/10.1017/s1431927605051081.

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The need of techniques for determining the mechanical properties of thin films, e.g. hardness coatings on ion beam treated surfaces has prompted a study of the microindentation hardness technique. The present interest is driven to a good understanding of the adhesion, friction, wear, and indentation processes. In most of the solid-solid interfaces of technological relevance, it occurs contact in many asperities, and this is why the study of fundamental properties of micro-mechanic and tribology of surfaces and interfaces is very important. The recent developments of different microscopic techn

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Suk, M. "The Effect of Disk Roughness on the Wear of Contact Recording Heads." Journal of Tribology 118, no. 4 (1996): 794–99. http://dx.doi.org/10.1115/1.2831610.

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In conventional disk files, the slider is supported by an air-bearing when the disk is rotating at its designed speed. With the continued reduction of magnetic spacing in order to increase the areal density, a natural extension of the traditional recording system is contact recording. We investigate the wear of the contact recording head designed for such a class of rigid magnetic disk files where the read/write element carrying slider is intended to remain in continuous contact during every phase of the disk drive operation. In particular, we study the effect of disk roughness and load on the

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Bernardin, John D., and Issam Mudawar. "A Leidenfrost Point Model for Impinging Droplets and Sprays." Journal of Heat Transfer 126, no. 2 (2004): 272–78. http://dx.doi.org/10.1115/1.1652045.

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This study presents, for impinging droplets and sprays, a model of the Leidenfrost point (LFP); the minimum liquid/solid interface temperature required to support film boiling on a smooth surface. The present model is an extension of a previously developed sessile drop model, based on bubble nucleation, growth, and merging criteria, as well as surface cavity size characterization [3]. The basic concept of the model is that for liquid/solid interface temperatures at and above the LFP, a sufficient number of cavities are activated and the bubble growth rates are sufficiently fast that a continuo

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Song, H., V. S. Deshpande, and E. Van der Giessen. "Discrete dislocation plasticity analysis of loading rate-dependent static friction." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 472, no. 2192 (2016): 20150877. http://dx.doi.org/10.1098/rspa.2015.0877.

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From a microscopic point of view, the frictional force associated with the relative sliding of rough surfaces originates from deformation of the material in contact, by adhesion in the contact interface or both. We know that plastic deformation at the size scale of micrometres is not only dependent on the size of the contact, but also on the rate of deformation. Moreover, depending on its physical origin, adhesion can also be size and rate dependent, albeit different from plasticity. We present a two-dimensional model that incorporates both discrete dislocation plasticity inside a face-centred

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Sammonds, Peter R., Daniel C. Hatton, and Daniel L. Feltham. "Micromechanics of sea ice frictional slip from test basin scale experiments." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, no. 2086 (2017): 20150354. http://dx.doi.org/10.1098/rsta.2015.0354.

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We have conducted a series of high-resolution friction experiments on large floating saline ice floes in an environmental test basin. In these experiments, a central ice floe was pushed between two other floes, sliding along two interfacial faults. The frictional motion was predominantly stick–slip. Shear stresses, normal stresses, local strains and slip displacement were measured along the sliding faults, and acoustic emissions were monitored. High-resolution measurements during a single stick–slip cycle at several positions along the fault allowed us to identify two phases of frictional slip

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McHale, Glen, Michael I. Newton, Neil J. Shirtcliffe, and Nicasio R. Geraldi. "Capillary origami: superhydrophobic ribbon surfaces and liquid marbles." Beilstein Journal of Nanotechnology 2 (March 10, 2011): 145–51. http://dx.doi.org/10.3762/bjnano.2.18.

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In the wetting of a solid by a liquid it is often assumed that the substrate is rigid. However, for an elastic substrate the rigidity depends on the cube of its thickness and so reduces rapidly as the substrate becomes thinner as it approaches becoming a thin sheet. In such circumstances, it has been shown that the capillary forces caused by a contacting droplet of a liquid can shape the solid rather than the solid shaping the liquid. A substrate can be bent and folded as a (pinned) droplet evaporates or even instantaneously and spontaneously wrapped on contact with a droplet. When this effect

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Wang, S., and K. Komvopoulos. "A Fractal Theory of the Temperature Distribution at Elastic Contacts of Fast Sliding Surfaces." Journal of Tribology 117, no. 2 (1995): 203–14. http://dx.doi.org/10.1115/1.2831227.

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The statistical temperature distribution at fast sliding interfaces is studied by characterizing the surfaces as fractals and considering elastic deformation of the asperities. The fractions of the real contact area in the slow, transitional, and fast sliding regimes are determined based on the microcontact size distribution. For a smooth surface in contact with a rough surface, the temperature rises at the real contact area are determined under the assumption that most of the frictional heat is transferred to one of the surfaces. The interfacial temperature rises are bounded by the maximum te

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Spinu, Sergiu. ""THERMOELASTIC DISPLACEMENT AND TEMPERATURE RISE IN A HALF-SPACE DUE TO A STEADY-STATE HEAT FLUX "." International Journal of Modern Manufacturing Technologies 14, no. 3 (2022): 326–32. http://dx.doi.org/10.54684/ijmmt.2022.14.3.326.

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Due to model complexity, classical contact mechanics theory assumes isothermal contact processes, involving bodies with uniform temperatures and no heat transmitted or generated through or near the contact interface. This paper addresses the problem of frictional heating in non-conforming or rough contacts by investigating the thermoelastic behaviour of asperities. The heat generated in a sliding contact by interfacial friction leads to thermoelastic distortion of the contact surface, further modifying contact parameters such as pressure, gap or temperature. The thermal expansion of the contac

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Moose, C. A., D. A. Koss, and J. R. Hellmann. "Interfacial Shear Behavior of Sapphire-Reinforced NiAi Composites." MRS Proceedings 194 (1990). http://dx.doi.org/10.1557/proc-194-293.

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AbstractThe interfacial shear behavior in near-equiatomic NiA1 reinforced by sapphire filaments has been examined at room temperature using a fiber pushout test technique. The loaddisplacement data indicate a large variability in the initial interface failure stress, although reverse push behavior indicates a comparatively constant interfacial sliding friction stress. The observed behavior suggests that the presence of asperities on the fiber surfaces and nonuniformities in fiber diameter require constrained plastic flow within the NiAl matrix in order for interfacial shear to occur. The locat

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Gao, Zhiqiang, Weiping Fu, Wen Wang, Leiting Lou, and Jiebei Wu. "Normal Damping Model of Mechanical Joints Interfaces Considering Asperities in Lateral Contact." Journal of Tribology 140, no. 2 (2017). http://dx.doi.org/10.1115/1.4037954.

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A mechanical interface behaves as the stiffness and damping when the interface is bearing a static normal force and a sine normal exciting force. For the interfacial normal damping, a calculating model was proposed. This proposed model studied the lateral contact (shoulder–shoulder contact) between upper and lower asperities in the elastic and elastic-perfectly plastic stages, which is neglected by other classical models. The normal force can be divided into a normal component and a tangential component when two asperities are contacting in dislocation. The relation between the loading–unloadi

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Carmona, Eric A., and Paul Albertus. "Modeling How Interface Geometry and Mechanical Stress Affect Li Metal / Solid Electrolyte Current Distributions." Journal of The Electrochemical Society, February 3, 2023. http://dx.doi.org/10.1149/1945-7111/acb8e3.

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Abstract We develop a coupled electrochemical-mechanical model to assess the current distributions at Li/single-ion conducting solid ceramic electrolyte interfaces containing a parameterized interfacial geometric asperity, and carefully distinguish between the thermodynamic and kinetic effects of interfacial mechanics on the current distribution. We find that with an elastic-perfectly plastic model for Li metal, and experimentally relevant mechanical initial and boundary conditions, the stress variations along the interface for experimentally relevant stack pressures and interfacial geometries

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Shan, Lei, Steven Danyluk, and Joseph Levert. "Interfacial Pressure Measurements at Chemical Mechanical Polishing Interfaces." MRS Proceedings 566 (1999). http://dx.doi.org/10.1557/proc-566-187.

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We have found that the entrainment of a slurry between a silicon surface and a polyurethane pad will cause the generation of subambient pressure at that interface. These pressures cause the silicon to be further impressed into the pad. We have measured these pressures and this paper reports on the pressure distribution maps over an area beneath a 100mm diameter silicon wafer. The pressures are generally not uniform. The leading 2/3 of the wafer has subambient pressures of the order of 50kPa and the trailing 1/3 of the wafer has positive pressures of approximately 10kPa. The reasons for the sub

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Shi, Xi, Yunwu Zou, and Huibo Fang. "Numerical Investigation of the Three-Dimensional Elastic–Plastic Sloped Contact Between Two Hemispheric Asperities." Journal of Applied Mechanics 83, no. 10 (2016). http://dx.doi.org/10.1115/1.4034121.

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For real engineering surfaces contact, most asperities come into contact in a configuration of shoulder-to-shoulder instead of aligned head-on. In this work, a three-dimensional (3D) model of two identical elastic–plastic spherical asperities in contact was developed which characterizes the initial contact offset with polar angle α and azimuthal angle β. The simulations with finite-element method (FEM) show that the adhesive coefficient of friction (COF) is only influenced by large initial azimuthal angle thus mainly depends on interfacial shear strength. The plowing COF is determined, however

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Marks, L. D., and K. P. Olson. "Flexoelectricity, Triboelectricity, and Free Interfacial Charges." Small, August 25, 2024. http://dx.doi.org/10.1002/smll.202310546.

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AbstractTriboelectricity has been a topic of some confusion for many years, probably because it is very diverse and some of the fundamental science has not been clear. This is now starting to change. A few years ago, the importance of flexoelectricity at asperities is pointed out. That paper exploited the established physics of compensation of bound surface or interfacial charges without going into detail. The purpose of this paper is to expand further on this, mapping from the established physics of electrostatics with contact potentials and Maxwell's displacement field to the underlying fund

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Dini, D., and D. A. Hills. "Frictional Energy Dissipation in a Rough Hertzian Contact." Journal of Tribology 131, no. 2 (2009). http://dx.doi.org/10.1115/1.3063697.

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The interfacial contact pressure and shear traction distributions are found for a sphere pressed onto an elastically similar half-space whose surface is populated by a uniform array of spherical asperities, when the normal load is constant and an oscillatory shear, less than that needed to cause sliding, is imposed. Details of the load history suffered by asperities in an outer sliding annulus and an inner disk, where they experience partial slip, are found, together with the effects of the roughness on the overall tangential compliance and the frictional energy losses. It is shown that for th

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Huang, Gancai, Chao Liu, Wenzhen Xie, and Dongxiang Jiang. "Normal contact stiffness model for fractal surfaces considering scale dependence and friction behavior." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, November 16, 2022, 135065012211389. http://dx.doi.org/10.1177/13506501221138995.

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The normal contact stiffness on rough surfaces has a significant impact on the interfacial dynamic characteristics of mechanical joints. Based on the fractal geometry theory, this work improves the contact stiffness modeling by considering the complete contact characteristics of multiple asperities and frictional factor. First, to include the property that the critical contact areas of asperities are scale-dependent, the model for the contact stiffness is formed on each scale and the relationship between total stiffness and load on rough surfaces is obtained by the summation of all length scal

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Jeng, Yeau-Ren, and Shin-Rung Peng. "Static Friction Model of Elastic-Plastic Contact Behavior of Surface With Elliptical Asperities." Journal of Tribology 131, no. 2 (2009). http://dx.doi.org/10.1115/1.3075857.

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The friction coefficient (μ) of a contact surface with elliptical asperities is examined at various values of the plasticity index (ψ), the effective radius ratio (γ), the shear-strength-pressure proportionality constant (c), and the dimensionless limiting interfacial shear strength (τ¯m). The results demonstrate that the friction coefficient of the contact system increases with an increasing value of γ but decreases with an increasing value of ψ. Furthermore, it is shown that Amonton’s law is applicable for contact systems with either a low ψ and a high τ¯m or a high ψ and a low τ¯m. Analyzin

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Jin, Fan, Qiang Wan, and Xu Guo. "Plane Contact and Partial Slip Behaviors of Elastic Layers With Randomly Rough Surfaces." Journal of Applied Mechanics 82, no. 9 (2015). http://dx.doi.org/10.1115/1.4030742.

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A plane contact and partial slip model of an elastic layer with randomly rough surface were established by combining the Greenwood–Williamson (GW) rough contact model and the Cattaneo–Mindlin partial slip model. The rough surface of the elastic layer bonded to a rigid base is modeled as an ensemble of noninteracting asperities with identical radius of curvature and Gaussian-distributed heights. By employing the Hertzian solution and the Cattaneo–Mindlin solution to each individual asperity of the rough surface, we derive the total normal force, the real contact area, and the total tangential f

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Jiang, Jishen, Bingqian Xu, Weizhe Wang, Richard Amankwa Adjei, Xiaofeng Zhao, and Yingzheng Liu. "Finite Element Analysis of the Effects of Thermally Grown Oxide Thickness and Interface Asperity on the Cracking Behavior Between the Thermally Grown Oxide and the Bond Coat." Journal of Engineering for Gas Turbines and Power 139, no. 2 (2016). http://dx.doi.org/10.1115/1.4034259.

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Finite element simulations based on an interface cohesive zone model (CZM) have been developed to mimic the interfacial cracking behavior between the α−Al2O3 thermally grown oxide (TGO) and the aluminum-rich Pt–Al metallic bond coat (BC) during cooling from high temperature to ambient temperature. A two-dimensional half-periodic sinusoidal geometry corresponding to interface undulation is modeled. The effects of TGO thickness and interface asperity on the stress distribution and the cracking behavior are examined by parametric studies. The simulation results show that cracking behavior due to

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Luo, Xiangcheng, and D. D. L. Chung. "Tribology of Material Contacts under Dynamic Loading, Studied by Electrical Resistance Measurement." MRS Proceedings 697 (January 2001). http://dx.doi.org/10.1557/proc-697-p8.11.

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AbstractThe tribology of material contacts under cyclic compression in the direction perpendicular to the plane of the contact was studied by measurement of the contact electrical resistivity of the contact during the dynamic loading. The real-time monitoring allowed observation of both reversible and irreversible effects. The material contacts studied were those involving steel, carbon fiber polymer-matrix composite, cement mortar and graphite, due to their relevance to fastening, concrete structures, electric brushes and electrical pressure contacts. Correlation was made between the contact

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Hu, Mengsu, and Jonny Rutqvist. "Multi-scale Coupled Processes Modeling of Fractures as Porous, Interfacial and Granular Systems from Rock Images with the Numerical Manifold Method." Rock Mechanics and Rock Engineering, April 9, 2021. http://dx.doi.org/10.1007/s00603-021-02455-6.

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AbstractThe greatest challenges of rigorously modeling coupled hydro-mechanical processes in fractured rocks at different scales are associated with computational geometry. In addition, selections of continuous or discontinuous models, physical laws, and coupling priorities at different scales based on different geometric features determine the applicability of a numerical model for a certain type of problem. In this study, we present our multi-scale modeling capabilities that have been developed based on the numerical manifold method for analyzing coupled hydro-mechanical processes in fractur

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Jin, Shengbo, Heting Qiao, and Jing Zhao. "Temperature‐dependent tribological and interfacial properties of perfluoroelastomer nanocomposites modified with graphene nanosheets functionalized through molecular dynamics simulations." Polymer Composites, April 9, 2025. https://doi.org/10.1002/pc.29883.

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AbstractThe present simulation‐based study aims to develop high‐performance polymer nanocomposites (FFKM) by investigating the influence of graphene modified with different polar functional groups on the high‐temperature load‐bearing tribological and interfacial properties of FFKM nanocomposites. Molecular dynamics simulations were employed to explore the effects of hydroxyl (OH), carboxyl (COOH), and amino (NH2) functional groups on the tribological and interfacial behavior of FFKM across a broad temperature range (298–573 K). Utilizing analysis tools such as large‐scale atomic/molecular m

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Sylvain, Barbot. "Hydrothermal activation of granite friction with multiple healing mechanisms." December 14, 2021. https://doi.org/10.5281/zenodo.5781431.

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The constitutive behavior of faults is central to many interconnected aspects of earthquake science, from fault dynamics to induced seismicity, to seismic hazards characterization. Yet, a friction law applicable to the wide range of hydrothermal conditions found in the continental crust is still missing. Here, we assemble a constitutive framework that captures the frictional response of granitic gouge in dry and wet conditions from room temperature to 900\,$^\circ$C. The sliding velocity dependence on shear and normal traction, temperature, and a state variable representing the size of micro-a

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