Published in Granular Matter
We perform numerical simulations of plane strain compression tests of Ottawa sand samples inspired by previous micro computed tomography experiments. The numerical code used for computations makes it possible to mimic in a realistic way the complex boundary conditions of the experimental test, and to introduce grains with complex morphologies based...
Published in Bulletin of Materials Science
Effect of maleic-anhydride-grafted-polypropylene (PP-g-MA) and graphene oxide (GO) addition on the tribological properties of polypropylene (PP) nanocomposites were investigated in this study. Graphene oxides with different levels (0.05 and 0.15 wt%) were used as reinforcing filler for PP nanocomposites. Maleic-anhydride-grafted-polypropylene (3 wt...
Published in SN Applied Sciences
Equal Channel Angular Extrusion (ECAE) is a simple process which is suitable to deform bulk materials into extremely large strains in order to achieve ultra-fine grained (UFG) structures. However, ECAE has some limitations. In order to eliminate these shortcomings, some methods were developed including ECAE in parallel channels. In the present work...
Published in Tribology Letters
Coarse-grained molecular dynamics simulations were carried out to investigate the frictional properties of lubricant molecules on nanostructured metal surfaces. The simulation cell consists of a lubricant film enclosed between two metal surfaces. The attractive potential of specific iron atoms on the surface was modified such that the lubricant mol...
Published in Earth, Planets and Space
The Nankai Trough in Southwest Japan exhibits a wide spectrum of fault slip, with long-term and short-term slow-slip events, slow and fast earthquakes, all associated with different segments down the plate interface. Frictional and viscous properties vary depending on rock type, temperature, and pressure. However, what controls the down-dip segment...
For over a decade the use of bio inspired adhesives have been explored to achieve high reversable attachment on a wide range of surfaces. Based on the fibrillar adhesive toepads of geckos, many patterned adhesives have been produced that are able to form and preserve contact with rigid and smooth substrates. But on other types of surfaces, such as ...
Published in Tribology Letters
We are grateful to Dr. B.N.J. Persson for his prompt attention to our work (Hu et al. in Tribol Lett, 10.1007/s11249-019-1247-7, 2020). In his Comment, he remarks (i) that near-critical damping of motion in/on solids, one of our main results, is well known for atoms and molecules at surfaces and (ii) that this result may be invalid for real practic...
Published in Tribology Letters
We present results from a systematic investigation of environmental effects on the frictional behavior of Au–Ni multilayer films of varying interlayer spacing. The current results, sliding against ruby spheres in a dry N2 atmosphere, are compared to prior work on the tribological behavior of these materials under ultra-high vacuum (UHV) (Cihan et a...
Published in International Journal of Automotive Technology
In this paper, we present a study on the stick-slip torsional vibration of the spinning shaft in an automotive water pump. We propose a dynamic rotor model with a pulley, an impeller, a mechanical seal and a shaft to analyze the stick-slip vibration of a water pump. The dynamic states of the mechanical seal are classified into stick and slip states...
Published in SN Applied Sciences
Contact problems have been widely investigated for many years. However, there are few reports on the real-time observation of shear stress evolution in friction process by experimental method. In this paper, the plane stress fields of slider-on-block contact in different contact states were observed by photoelasticity experiments and finite element...
