Frictional properties of filled Sitall-3

1975 ◽  
Vol 14 (7) ◽  
pp. 546-548
Author(s):  
N. D. Nazarenko ◽  
A. I. Yuga ◽  
N. I. Vlasko ◽  
L. F. Kolesnichenko
Keyword(s):  
Frictional Properties

FEDERATED No. 8

Alloy Digest ◽  
1956 ◽  
Vol 5 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Frictional Properties ◽  
Good Corrosion Resistance ◽  
High Speeds ◽  
Bearing Alloy

Abstract FEDERATED No. 8 is a lead-base bearing alloy recommended for moderate to high speeds and moderate loads. It has very good frictional properties, reasonably good corrosion resistance and low price. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fatigue. It also includes information on casting and joining. Filing Code: Pb-3. Producer or source: Federated Metals Corporation, ASARCO Inc..

scholarly journals Frictional properties of anorthite (feldspar): implications for the lower boundary of the seismogenic zone

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Koji Masuda
Keyword(s):  
Dominant Role ◽  
Lower Boundary ◽  
Earthquake Magnitude ◽  
Seismogenic Zone ◽  
Effective Pressure ◽  
Velocity Dependence ◽  
Brittle Deformation ◽  
Frictional Properties ◽  
Depth Extent ◽  
Mineral Constituents

Abstract Earthquake magnitude is closely related to the depth extent of the seismogenic zone, and higher magnitude earthquakes occur where the seismogenic zone is thicker. The frictional properties of the dominant mineral constituents of the crust, such as feldspar-group minerals, control the depth extent of the seismogenic zone. Here, the velocity dependence of the steady-state friction of anorthite, the calcic endmember of the feldspar mineral series, was measured at temperatures from 20 to 600 °C, pore pressures of 0 (“dry”) and 50 MPa (“wet”), and an effective pressure of 150 MPa. The results support previous findings that the frictional properties of feldspar play a dominant role in limiting the depth extent of the seismogenic zone. This evidence suggests that brittle deformation of anorthite may be responsible for brittle fault movements in the brittle–plastic transition zone.

Frictional properties of electron beam-deposited a-C:Si films

2020 ◽  
Vol 110 ◽  
pp. 108150
Author(s):  
Ippei Tanaka ◽  
Gaku Ohtgita ◽  
Yasunori Harada
Keyword(s):  
Electron Beam ◽  
Frictional Properties

Water-lubricated frictional properties of the C/C-SiC composites with different SiC phase content fabricated by RMI

2020 ◽  
pp. 1-9
Author(s):  
Zhizhong Xue ◽  
Rong Xue ◽  
Nanlong Zhang ◽  
Lixue Zhang ◽  
Xuan Liu ◽  
...  
Keyword(s):  
Phase Content ◽  
Frictional Properties ◽  
Sic Composites

Estimation of frictional properties and slip evolution on a long-term slow slip event fault with the ensemble Kalman filter: numerical experiments

2019 ◽  
Vol 219 (3) ◽  
pp. 2074-2096 ◽  
Author(s):  
Kazuro Hirahara ◽  
Kento Nishikiori
Keyword(s):  
Surface Displacement ◽  
Slip Rate ◽  
Slow Slip ◽  
Slow Slip Events ◽  
Actual Distribution ◽  
Frictional Properties ◽  
Data Analyses ◽  
Bungo Channel ◽  
Megathrust Faults ◽  
Gnss Data

Summary A variety of slow slip events at subduction zones have been observed. They can be stress meters for monitoring the stress state of megathrust faults during their earthquake cycles. In this study, we focus on long-term slow slip events (LSSEs) recurring at downdip portions of megathrust faults among such slow earthquakes. Data analyses and simulation studies of LSSEs have so far been executed independently. In atmosphere and ocean sciences, data assimilations that optimally combine data analyses and simulation studies have been developed. We develop a method for estimating frictional properties and monitoring slip evolution on an LSSE fault, with a sequential data assimilation method, the ensemble Kalman filter (EnKF). We executed numerical twin experiments for the Bungo Channel LSSE fault in southwest Japan to validate the method. First, based on a rate- and state-dependent friction law, we set a rate-weakening circular LSSE patch on the rate-strengthening flat plate interface, whose critical nucleation size is larger than that of the patch, and reproduced the observed Bungo Channel LSSEs with recurrence times of approximately 7 yr and slip durations of 1 yr. Then, we synthesized the observed data of surface displacement rates at uniformly distributed stations with noises from the simulated slip model. Using our EnKF method, we successfully estimated the frictional parameters and the slip rate evolution after a few cycles. Secondly, we considered the effect of the megathrust fault existing in the updip portion of the LSSE fault, as revealed by kinematic inversion studies of Global Navigation Satellite System (GNSS) data and added this locked region with a slip deficit rate in the model. We estimated the slip rate on the locked region only kinematically, but the quasi-dynamic equation of motion in each LSSE fault cell includes the stress term arising from the locked region. Based on this model, we synthesized the observed surface displacement rate data for the actual distribution of GNSS stations and executed EnKF estimations including the slip rate on the locked region. The slip rate on the locked region could be quickly retrieved. Even for the actual distribution of GNSS stations, we could successfully estimate frictional parameters and slip evolution on the LSSE fault. Thus, our twin numerical experiments showed the validity of our EnKF method, although we need further studies for actual GNSS data analyses.

An experimental study of the influence of heat storage and transportability of different lubricants on friction under transient elastohydrodynamic conditions

2003 ◽  
Vol 217 (1) ◽  
pp. 27-37 ◽  
Author(s):  
B-O Åhrström ◽  
C Penchinat ◽  
T Norrby
Keyword(s):  
Heat Storage ◽  
Improve Performance ◽  
Dynamic Simulations ◽  
Successful Model ◽  
Frictional Properties ◽  
Fast Fourier Transform Analysis ◽  
Propagating Waves ◽  
Frictional Forces ◽  
Observed Behaviour ◽  
Reduce Emissions

Lubricated transient elastohydrodynamic (EHD) conjunctions are extremely difficult to simulate numerically since lubricant properties such as temperature and viscosity vary significantly during the loading-unloading event. Nevertheless, industry has invested considerable time and effort in trying to create such models in order to improve performance and to reduce emissions and friction. One of the essential requirements for a successful model is accuracy in the implementation of frictional properties. The experimental method presented in this paper used an impact on the end surface of a beam to generate propagating waves that were subjected to fast Fourier transform analysis. The method yielded detailed information about the build-up and decay of normal and frictional forces as a function of time for various lubricants at three different initial temperatures (20, 40 and 80°C) and at relevant EHD pressures. A variety of lubricants were studied to a peak Hertzian pressure of 2.5GPa for loading-unloading times of 200-400 μs (typical for elastohydrodynamically lubricated conjunctions in ball bearings and gears). A qualitative study of the thermal properties of the lubricants and their influence on viscosity and friction coefficient was also undertaken and, finally, a plausible explanation of the observed behaviour is presented and parallels to dynamic simulations of polyatomic gases are drawn.

A Discussion on natural strain and geological structure - Fold shapes as functions of progressive strain

1976 ◽  
Vol 283 (1312) ◽  
pp. 129-138 ◽  
Keyword(s):  
Boundary Conditions ◽  
Mechanical Behaviour ◽  
Finite Strain ◽  
Geological Structure ◽  
Stages Of Development ◽  
Rock System ◽  
Frictional Properties ◽  
Natural Strain ◽  
Progressive Strain ◽  
Strain Dependent

The folding of the components (layers or texture) of a rock system is viewed as an unstable strain-dependent process. The folds undergo successive stages of development, including initiation, amplification, propagation and decay. Fold shapes are functions of (i) initial morphology, (ii) mechanical behaviour of the rock, including stiffness contrasts and frictional properties of adjacent components, (in) overall finite strain. The folded components may or may not adopt periodic waveforms, depending on (i) the relative rates of propagation versus amplification of the folds and (n) the boundary conditions of the rock system.

Tire Friction on Wet Roads

1976 ◽  
Vol 49 (3) ◽  
pp. 862-908 ◽  
Author(s):  
K. A. Grosch ◽  
A. Schallamach
Keyword(s):  
Hydrodynamic Lubrication ◽  
Vehicle Control ◽  
Critical Conditions ◽  
Frictional Properties ◽  
Road Surfaces ◽  
Road Friction ◽  
Tire Forces ◽  
The One ◽  
Tire Friction ◽  
Contact Pressures

Abstract Evidence accumulates that tire forces on wet roads, particularly when the wheel is locked, are determined by the dry frictional properties of the rubber on the one hand and by hydrodynamic lubrication in the contact area on the other. The probable reason why they are so clearly separable is that water is a poor lubricant, tending to separate into globules and dry areas under relatively small pressures. Road surfaces and tire profiles are, therefore, designed to create easy drainage and high local contact pressures. The influence of road friction on vehicle control well below the critical conditions is becoming more clearly understood; but more Investigations are required here, in particular under dynamic conditions.

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