Lamellar sodium-montmorillonite (NaMMT) was used as reinforcing filler to improve the abrasion resistance of polyethersulfone (PES)/polytetrafluoroethylene (PTFE)-based polymers. As filler, the interlayer distance of NaMMT was decreased from 1.523 to 0.995 nm, resulting from the evaporation of interlayer water during the heat treating of composites. The abrasion resistance of PES/PTFE-based composite

The history of the following note is as follows. In 2003, I invited Kenneth Johnson to Berlin to give a talk on adhesion in a seminar at the Institute of Mechanics. His lecture on the topic "Mechanics of adhesion of spherical surfaces" took place on Monday, January 26, 2004. In the run-up to the seminar, Professor Johnson sent me a historical note dated November 18, 2003. In my opinion, this note,

The friction behavior of high-purity titanium in microscale was experimentally investigated by using atomic force microscopy to scan two neighboring grains with different crystalline orientations across the grain boundary. The results indicated that there were obvious friction contrast (FG1/FG2) between the two neighboring grains. The friction contrast became more obvious when higher normal load was

Many critical parts such as surface parts of high-speed trains, bins and hoppers, and pipes, bends and valves in material transportation applications as well as a helicopter, mixer, and turbine blades, which can be exposed to particle wear due to the application environment, can be easily manufactured today due to the advances in 3D printing technology. For this reason, an experimental study was carried

A multi-scale flash temperature model has been developed and validated against existing work. The core strength of the proposed model is that it can be adapted to predict flash contact temperatures occurring in various types of sliding systems. In this paper, it is used to investigate how different surface roughness parameters affect the flash temperatures. The results show that for decreasing Hurst

Copper matrix composites with carbon nanotubes/Cu composite foams as the reinforcing skeletons (CNTs/Cuf®Cu) were prepared by electrodeposition and spark plasma sintering. The microstructure and tribological properties of the composites were studied. The CNTs reinforcements with the content up to 0.283 vol% remained uniformly distributed in the skeleton zone and led to quite different structure and

The viscous heat of gas bearings and heat generated by the motor cause a large temperature difference between the bearing surface and lubricating gas influencing the bearing performance in gas-bearing applications. This study investigated the effects of the bearing surface temperature and supply gas temperature on the static characteristics of a six-orifice externally pressurized gas thrust bearing

The influence of friction blocks connection configuration on the interfacial tribology behavior and FIVN (friction-induced vibration and noise) of the high-speed railway braking system is systematically investigated with a scaled brake test bench. The potential relationship among interface contact status, friction, wear, pressure distribution, thermal response, and vibration noise of the system is

The ability to measure the level of friction between the human skin and a given textile is critical across fashion and textiles sectors, not least for the development of sporting and protective clothing. A portable custom-made device capable of measuring friction during the skin-textile interaction across often difficult or impossible to investigate body regions with objective repeatability has been

The friction behavior of metals is directly linked to the mechanisms that accommodate deformation. We examine the links between mechanisms of strengthening, deformation, and the wide range of friction behaviors that are exhibited by shearing metal interfaces. Specifically, the focus is on understanding the shear strength of nanocrystalline and nanostructured metals, and conditions that lead to low

The functionalized graphene/montmorillonite (FG/MTT) nanosheet was synthesized through chemical bonding by a simple, green method, which had remarkable dispersion stability in oil and its lubricating performance was evaluated by a four-ball tribometer. The test results showed that FG/MTT had a preeminent lubricant property when the concentration was 0.4 mg/ml. Compared with the bare oil sample, its

The present study is meant to obtain tribological insight into the interface of a rolling rubber wheel on a counter-surface disk based on the work of the previous study Salehi et al. (Tribol Lett 68(1):37, 2020), in which a new test method was developed to rapidly predict tire grip in a laboratory environment. A Laboratory Abrasion Tester (LAT100) was used and exploited as a tribometer. This opened

We develop an analytical model of adhesive wear between two unlubricated rough surfaces, forming micro-contacts under normal load. The model is based on an energy balance and a crack initiation criteria. We apply the model to the problem of self-affine rough surfaces under normal load, which we solve using the boundary element method. We discuss how self-affinity of the surface roughness, and the complex

We carried out molecular dynamics simulations to study the effects of environmental moisture and functional groups on the sliding adhesive behaviour of graphene steps at the atomic scale. Environmental water plays a dual role in separating interfaces and additional passivation during the sliding process. For a diamond tip, functionalization of graphene steps exhibits different chemical properties.

Abrasive wear resulting from the microclastic rock is a common failure phenomenon in the drilling environment that often limits the sealing ability and the service life of seals. In this study, the friction and wear process of fluoro rubber (FKM) seals against 304 stainless steel (SS304) after one single entry of SiO2 abrasives were investigated. The influence of the changes in particle state on friction

Four lithium greases were prepared with paraffinic oil, naphthenic oil, poly-α-olefin (PAO) and polyol ester (PE), respectively. Their physiochemical, tribological and rheological properties were investigated. It was found that naphthenic oil-based grease exhibited the best colloidal stability. SEM analysis revealed that lithium fibers in PE-based grease showed a relatively flat network compared to

We report an investigation of the friction mechanisms of MoS2 thin films under changing environments and contact conditions using a variety of computational and experimental techniques. Molecular dynamics simulations were used to study the effects of water and molecular oxygen on friction and bonding of MoS2 lamellae during initial sliding. Characterization via photoelectron emission microscopy (PEEM)

The short chain ILs [BMIM] Oleate and [BMIM] Phosphate were explored as lubricant additives in both polar and non-polar base oils through using the multifunctional surfactants Triton-x-100 and PIBSA respectively. The formulations were stable and showed significant reductions in friction and wear compared with the base oil alone, the [BMIM] Phosphate Triton-x-100 in the Group V base oil showed a 63%

In order to obtain a high material removal rate and good surface quality, the effect of Cu2+ ions and glycine complex as a catalyst on the chemical mechanical polishing (CMP) performance of Si-face 6H-SiC substrates was investigated. The results indicated that the slurry with Cu2+-glycine complex had a higher material removal rate (MRR) and better surface quality than that without Cu2+-glycine complex

We report experimental measurements of friction between an aluminum alloy sliding over steel with various lubricant densities. Using the topography scans of the surfaces as input, we calculate the real contact area using the boundary element method and the dynamic friction coefficient by means of a simple mechanistic model. Partial lubrication of the surfaces is accounted for by a random deposition

Slipping is a major cause of injury and hospitalization in the USA and globally. Slipping occurs when the instantaneous friction between the shoe and floor is less than the required friction. While floor roughness is a key factor contributing to friction, prior investigations have primarily used stylus profilometry, which is incapable of measuring roughness at small scales, below approximately 1 micron

The load-induced dry-sliding wear behavior of alpha titanium (Ti) with low amount of boron (< 1 wt%) samples made through plasma transferred arc solid free form fabrication process were studied in the untreated and hardened shot-peened surface conditions. Shot peening conducted at 90 psi for two minutes for 100% coverage with S-550 steel shots, was found to lead to an increase in surface hardness,

Friction, wear and tribofilm growth of organic friction modifiers (glycerol monooleate and oleamide), anti-wear additive (ZDDP) and binary additive system comprising the organic friction modifiers and ZDDP were studied in polyalphaolefin (PAO) and ester oil. The mechanisms underlying base oil polarity-dependent frictional performance of the OFM and AW additives at high temperature (140 ℃), either singly

Microscratch test with a spherical indenter was carried out on copper under different tilt conditions and applied loads. Influence of surface slope and applied load on scratch responses such as friction coefficient, residual groove width, penetration depth was quantified by simple (e.g., linear, quadratic, and power-law) expressions. Apparent friction coefficient for non-tilt condition can be obtained

The erosion mechanism and deformation characteristics of rhomboid-shaped particle impacting metal beam are studied. Physical experiments of rhomboid-shaped particle impacting cantilever beam and fixed–fixed beam are carried out, respectively. The erosion behavior of particles and deformation characteristics of beam are captured by high-speed imaging system. Meanwhile, the numerical models of rhomboid-shaped

In elastohydrodynamic lubrication (EHL), the lubricant experiences pressures in excess of 500 MPa and strain rates larger than \(10^5\) \(\text{s}^{-1}\). The high pressures lead to a dramatic rise in the Newtonian viscosity and the high rates lead to large shear stresses and pronounced shear thinning. The extraction of accurate rheological properties using non-equilibrium molecular dynamics simulations

Understanding the distribution of interfacial separations between contacting rough surfaces is integral for providing quantitative estimates for adhesive forces between them. Assuming non-adhesive, frictionless contact of self-affine surfaces, we derive the distribution of separations between surfaces near the contact edge. The distribution exhibits a power-law divergence for small gaps, and we use

A correction to this paper has been published: https://doi.org/10.1007/s11249-021-01448-4

Heat-assisted magnetic recording (HAMR) is on the magnetic recording industry’s roadmap of next generation recording technology. The high temperature writing condition creates several reliability challenges for the head disk interface (HDI). Material buildup, or so-called smear, that accumulates between the head and the media is one key challenge. Our previous studies found that the material transfer

The last 25 years have seen immense changes, both in the world generally and in scientific publishing. It is now hard to imagine that our original editorial responsibilities included managing filing cabinets full of manuscripts and making frequent trips to the post office! In this first Invited Viewpoint, we have invited ourselves to highlight some of the key breakthroughs that have been made on topics