Showing papers in "Tribology International in 1991"

TL;DR: In this paper, the sliding wear characteristics of TiC-coated cemented carbide and high-speed steel during simulated machining conditions have been investigated using a modified pin-on-ring test, and the dominant wear mechanisms have been characterized using light optical microscopy and scanning electron microscopy.

TL;DR: In this paper, optical interferometry has been used to study the film thickness of an EHD point contact lubricated with grease, and the results showed a decreasing film thickness that tended to stabilize on about 0.2 μm after 40 cycles.

TL;DR: In this article, the water lubricated, sliding wear behavior of five polymeric materials has been investigated as a function of constant sliding velocities between 0.13-2.27 ms −1 and pressures of 1,3 and 5 MPa on a hardened stainless steel counterface with roughnesses which varied from 1-0.25 μm.

TL;DR: The biodeterioration potential of lubricating oils appears to be closely related to their viscosities, particularly on oils of low viscosity.

TL;DR: In this paper, an apparatus for the quantitative experimental investigation of the transient EHL problem for both line and point contacts is described, which can produce many types of dynamic load applied to the EHL contact zone.

TL;DR: In this article, a review of the cavitation erosion of cast iron is presented with an emphasis on the effects of the microstructure of the cast iron and the nature of the corrosive environment.

TL;DR: In this paper, the wear performance of polyimide composites with proven properties in the adhesive wear mode was investigated in extreme abrasive conditions under various loads, and the increase in wear with increasing percentage of fillers was attributed to the fact that the composites exhibited lesser ultimate tensile elongations than those of their parent polymers.

TL;DR: In this paper, three commercially available synthetic water-based grinding fluids were evaluated regarding possibilities for complete recycling using ultra-and microfiltration techniques, and two of the products were found suitable.

TL;DR: In this article, a dynamically loaded thrust bearing with as annular recess is presented and the effect of non-parallelism between the bearing and the runner surfaces is also considered, since this is a common problem in hydrostatic thrust bearings.

TL;DR: In this paper, a range of techniques which allow the imaging, spatial distribution, and size distribution of insolubles in automotive and industrial lubricating oils are described and illustrated for high magnification microscopy.

TL;DR: In this article, the friction between the teeth of a pair of hardened and ground spur gears has been measured in a back-to-back test rig using a disc machine under comparable conditions of load, speed and temperature.

TL;DR: In this paper, state-of-the-art in the field of self-lubrication mechanism studies is considered, collected by trobologists inmany countries are used for the development of quantitative approach to friction transfer and its part in self lubrication.

TL;DR: In this paper, boundary fractal dimensions of the texture and structure were used as the primary parameters for the characterization of particle morphology, and the suitability of this technique for the effective characterization of the particles has been evaluated by correlating boundary fractality dimensions with results obtained from standard microscopy examination.

TL;DR: In this paper, the importance of the plasticity index for defining the degree of elastic and plastic deformation of surface asperities is described and some experimental validation of the argument is provided and the method is extended to cover the case of ellipsoidal asperity contacts and the effect of work-hardening for a general as perity height probability distribution.

TL;DR: In this article, a model for steady, non-catastrophic, wear processes to the kinematic analysis of the cam/follower contact cycle has been proposed to identify critical conditions for wear in pivoted follower valve train systems.

TL;DR: In this article, the effect of crankshaft and crankcase stiffness on bearing hydrodynamics is discussed with reference to a particular engine bearing study and more general aspects of bearing distortion and stress are illustrated using finite element methods.

TL;DR: In this paper, acoustic emission (AE) signals are used to get an indication about the state of the friction processes, about the quality of solid and liquid layers on the contacting surfaces in real time, sometimes about intensity of wear, changing of wear and friction regimes and so on.

TL;DR: In this article, the effects of varying temperature regimes on the chemical characteristics of commercial mineral-based automotive crankcase oils and their base oils have been studied experimentally by simulating the hot-spot temperatures of parts of the engine surfaces, in an oxidizing atmosphere, using a modified version of the turbine oil oxidation test apparatus developed in our laboratory.

TL;DR: In this article, the results of investigations performed on the lubricity of liquid crystals and their solutions in petroleum and synthetic oils were shown to lead to a decrease in friction and wear for solids.

TL;DR: In this paper, a mathematical model to estimate elastic distortion of a thrust bearing on an elastic support by solving Reynolds' and elasticity equations simultaneously is discussed, and a new approach is used for loading stepwise, to change film profile slowly, to reach the target load through the proposed modified algorithm.

TL;DR: A new parameter is introduced into the contact model of rough surfaces which characterizes the contact spot density and the results are compared with know experimental regularities which are interpreted on the basis of this model.

TL;DR: In this paper, the influence of surface topography on contacting solids is considered and the rough surface model is suggested and used for the calculation of some tribological contact characteristics, such as deformation, number of contact spots, average spot area, average distance between contact spots and intercontact gap.

TL;DR: In this paper, a conductimetric method for TBN is described based upon IP 177 and 276 (ASTM D-664 and 2896) solution chemistry, which is an alternative to the trisolvent TBN method.

TL;DR: In this paper, a hydrodynamic lubrication theory is developed for high-speed strip rolling, and the effects of the operating conditions on hydrodynamic pressure and temperature, film thickness, forward slip, roll load and torque and system instability are described in detail and compared with previously published data.

TL;DR: An overview of some recent results of investigations on the nature of abrasion in USSR and in particular in the Moscow Oil and Gas Institute can be found in this paper, where the authors do not pretend to cover all the results published in the USSR.

TL;DR: In this paper, a theoretical analysis of heavily loaded rigid asymmetrical rollers under combined rolling and sliding motions, by considering cavitation, is presented, where the modified Reynolds' and energy equations under isothermal boundaries are obtained and solved simultaneously for many values of a sliding parameter.

TL;DR: In this paper, the main problems in friction, wear and lubrication in connection with the field of application are examined, and the interrelation of electrical performances with friction and wear is discussed taking into account material properties and lubricant effects.

TL;DR: In this article, the relationship between the propagation of fatigue cracks and the behavior of plastic flow in the surface layer was experimentally investigated under lubricated rolling-sliding contact, where the test material was medium carbon steel (S45C).

TL;DR: In this paper, the contributions to the tribological chemistry of engine lubricating oil additive pack components of detergents, dispersants and corrosion inhibitors are discussed in terms of hydrogen bond formation, proton transfer, inverse micelle formation, aggregation, solubilization, neutralization and corrosive action.

TL;DR: In this paper, a spectrometric method was used for the determination of the chemical composition and concentration of wear particles generated in the contact surface of a worm wheel under different operating conditions.