Showing papers in "Wear in 1991"

TL;DR: In this paper, a study was conducted on the two most widely used titanium alloys, Grade 2 commercially pure titanium and the age-hardenable Ti6Al4V. Dry sand-rubber wheel tests were conducted to assess abrasion resistance; fretting, galling and reciprocating pin-on-plane tests are conducted to determine if there is a “best” counterface for these two Titanium alloys.

TL;DR: In this paper, the authors present geometric descriptions of the net frictional force and moment between a rigid body and a planar surface on which it slides, which implicitly contain the full relation between slip motion and frictional load.

TL;DR: In this paper, the authors surveyed the theory of rolling contact after a development of over 60 years, and indicated to which problem(s) of wheel-rail technology each of these theories is best suited.

TL;DR: In this article, the prediction method described in this paper brings all this information together into a single program in which each programme loop represents a single-journey calculation, and the position of the contact on the wheel and the wheel-rail creep forces and creepages are correlated and summed to give a material loss distribution across the wheel profile and hence a small change in profile shape.

TL;DR: In this article, the authors developed a comprehensive theoretical model for erosion, valid for all impact angles, combining the concept of localization of plastic deformation leading to lip formation and the generalized energy absorption relations valid for both impact angles and all shapes of eroding particles.

TL;DR: In this article, the abrasive wear behavior of silicon carbide particulate- and whisker-reinforced aluminum matrix composites was investigated under two-body abrasion conditions utilizing a pinon-disk apparatus.

TL;DR: In this article, mixed mode crack growth direction criteria have been applied to calculations of the loading experienced by surface-initiated rolling contact fatigue cracks growing at a shallow angle to the surface, and it was demonstrated that cracks grow on the plane of the maximum shear stress rather than perpendicular to the maximum tangential stress as occurs during conventional fatigue testing.

TL;DR: In this paper, a simple non-linear kinematic hardening law is described which is capable of predicting the response of rail steel to sliding contact loading, and an approximate technique is used to calculate the plastic flow that occurs when the shakedown limit is exceeded.

TL;DR: In this article, the friction and wear behavior of virgin polyetheretherketone (PEEK) and of polyetherketone and PEEK composites, including different types and amounts of fiber reinforcement and/or lubricating agents, was studied as a function of steel counterface roughness and testing temperature.

TL;DR: In this paper, the performance of polyamide 66, polyoxymethylene (POM), polyethyleneterephthalate (PETP), polyetheretherketone (PEEK), polyphenylenesulphide (PPS) and polyetherimide were compared with the same base materials filled with polytetrafluoroethylene and glass fibre.

TL;DR: In this paper, the effects of several particle variables on the erosivity of particle streams were determined, including shape, mass, size impact velocity and feed rate, and it was determined that the particle size effect was different for spherical and angular particles.

TL;DR: In this article, friction film formation and destruction between a semimetallic friction material formulation and a gray cast iron disk, and its influence on passenger car disk brake behavior is investigated.

TL;DR: In this article, the measurement and subsequent analysis of acoustic emission signals from lubricated sliding contacts is concerned with the measurement of the time-dependent nature of the acoustic signal, which is able to detect the presence of wear-reducing additives and the predominant wear process occurring.

TL;DR: In this article, the rate of particle impact on unit area of the surface at the stagnation line of erosion specimens was established as a function of particle size by short-time erosion tests.

TL;DR: In this paper, the authors performed friction tests on TiN-coated substrates at low speed (less than 0.1 m s −1 ) in air and found that the initial friction coefficients ranged from 0.15 to 0.2.

TL;DR: In this paper, the metal transfer from the tool electrode to the machined surface is studied by cross-sectional examination, electron spectroscopy for chemical analysis and X-ray diffraction analysis of the work surface.

TL;DR: Hard and wear-resistant alloy and composite clad layers have been produced on En 3b mild steel substrate using a 2 kW continuous wave CO2 laser as mentioned in this paper, and a comparative study of structure, chemical composition, wear and hardness has been made to evaluate the effect of incorporated SiC particles.

TL;DR: In this paper, the topographies of ground metallic surfaces with four different hardnesses were studied using contact profilometry, conventional roughness analysis, fractal analysis, and scanning electron microscopy (SEM).

TL;DR: Goyal et al. as mentioned in this paper considered the problem of sliding of planar rigid bodies, where the normal force is known a priori, and the friction force (and torque) may be a discontinuous function of the direction of motion.

TL;DR: In this paper, the effect of microstructure and mechanical properties on erosion was evaluated by heat treating the alloy at different solution treatment and aging temperatures for different lengths of time, and it was found that erosion rate increases with the precipitation on aging, but decreases with overaging due to the agglomeration of precipitates.

TL;DR: The water jet erosion behavior of Ti-Ni alloys has been studied in this article, where the variation in erosion resistance with chemical composition of alloys containing 54-60 wt.% nickel is described and discussed in terms of the microstructure of these alloys.

TL;DR: In this paper, a finite element stress and strain analysis of the sliding contact of a two-layer elastic-plastic half-space for various friction coefficients was conducted, and it was found that surface deformation, location of initial yielding, stresses and strains along the interfaces between layers strongly depend on the friction coefficient.

TL;DR: In this paper, the role of oxide debris during fretting was investigated using a mild steel, S45C, under the following conditions: peak-to-peak slip amplitude and normal load were varied from 50 to 200 μm and from 0.98 to 9.8 N respectively at 20 Hz.

TL;DR: In this paper, the relation between wear weight loss and material hardness is more complicated than in two-body abrasion, and an expression is proposed whereby the relation can be satisfactorily explained.

TL;DR: In this paper, the authors studied the triboemission characteristics of both negatively and positively charged particles from various materials such as metals, ceramics and glass using an apparatus specially developed for measuring the triboeemission of charged particles, including triboluminescence characteristics.

TL;DR: In this paper, the wear behavior of 2124 Al-SiCw/17-4 PH stainless steel systems under dry sliding wear was investigated using a pin-on-disk apparatus.

TL;DR: In this paper, an attempt to apply ultrasonic methods to evaluate the real contact area and the contact stiffness is reported, based on measurements of the coefficient of transmission of the longitudinal ultrasonic waves normally incident at the contact interface.

TL;DR: In this article, the ECA analyses were performed on the frictional tracks on metal blocks covered with the transfer films of PTFE-based composites containing zinc, copper, and lead powders.

TL;DR: In this article, short-time erosion tests were conducted with dilute water and water-glycerin suspensions of glass beads to determine the rate of particle impact and the dimensions of impact craters using annealed and electropolished OFHC copper rod specimens.