Orthodontic mechanotherapy encompasses the use of several archwlres during specific stages of treatment. Stainless steel, Nickel titanium (NITI), thermally activated Nickel titanium (CuNiTi), & b titanium (TMA) wires are the ones predominantly In use. The efficiency of sliding mechanics depends upon minimizing friction at the bracket arch wire interface. Friction may be Influenced by several fa...

PEEK is a high strength engineering thermoplastic that suffers from a high friction coefficient and a friction induced wear mode. Past studies with 0 m PEEK and PTFE powders resulted in composite solid lubricant that (at the optimal composition) had a wear rate of k= 2× 10−9 mm3/Nm ith a friction coefficient of μ= 0.12. A compositional grading of PEEK and PTFE is implemented in this study to cr...

Femtosecond time-resolved second harmonic generation studies of the barrierless isomerization of an organic dye, malachite green (MG), have been carded out at several aqueous interfaces. A comparison of the dynamics at the air/aqueous, alkane/aqueous and silica/aqueous interfaces, indicates increased friction and increased water structure at the aqueous interfaces relative to bulk water, in sup...

The tapered implant-abutment interface is becoming more popular due to the mechanical reliability of retention it provides. Consequently, understanding the mechanical properties of the tapered interface with or without a screw at the bottom has been the subject of a considerable amount of studies involving experiments and finite element (FE) analysis. This paper focuses on the tapered implant-a...

Stability of Geosynthetic Lining Systems is, for a geotechnical standpoint, a complex matter. Three geomechanical questions were identified: sliding of the geosynthetic lining system on slope, pull-out strength of the geosynthetic anchorage at the top of the slope, rain erosion of the cap cover. Research programmes carried out in France on these topics, , are presented. Use of laboratory facili...

The present paper deals with a micromechanical model of interface able to couple the damage (micro-crack) evolution, the non-penetration conditions (Signorini equations) and the friction effect (Coulomb’s law). At a typical point of the interface, a Representative Volume Element (RVE) is considered; it is characterized by the presence of two different materials and by a microcrack evolving alon...

In this study, the predictive model of friction coefficient using cylindrical compression was constructed through combining the finite element method and neutral networks. Namely, the related data of the materials characters, cylinder compression bulging, and how they were associated with friction coefficient was obtained by the finite element method. Based on those analysis data, the relations...

Original scientific paper In this paper, the results of investigations of the temperature field distribution and tool wearing during C60 steel turning are presented. Abrasive wear resistance tests were carried out for cutters made of low-alloy high-speed steel. Steel samples were heat treated, and then were subjected to ion nitriding, TiN coating, or to complex treatment. The influence of cutti...

We study the possibility for a semi-infinite block of linear viscoelastic material, in homogeneous frictional contact with a non-deformable one, to slide under shear via a periodic set of “self-healing pulses”, i.e. a set of drifting slip regions separated by stick ones. We show that, contrary to existing experimental indications, such a mode of frictional sliding is impossible for an interface...

A special phonomenon of self-lubrication compensation named hole-wedge effect was found in a bionic porous friction pair, meanwhile the origin and regularity of this effect and its tribological behaviors were discussed in this paper. The process of self-circulating compensation of lubrication was modeled, and taking ferrofluid as lubricant a series of experiments were designed and done. Researc...