Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 55 for “"normal load"”.
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A study of rolling adhesion in braking
The effect of normal load, contact velocity, and dwell time on the coefficient of adhesion at slip in braking was investigated. A test rig that simulated locomotive wheel/rail interactions was used for the experimentation. The results indicated a drop in the coefficient of adhesion with increasing …
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A study of the static to kinetic friction transition of polymers
… which simultaneously measures friction, normal load, and relative velocity was developed to study this transition. The polymers used in this study were nylon, ABS, polycarbonate, and fiberglass filled and unfilled polypropylene. Creep effects of polymers on the static coefficient and thus …
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Frictional vibrations in structural polymers
… the time dependence of friction under static load, friction-normal load relationships, surface roughness, internal lubrication, friction-velocity relationships, and system stiffness. Four basic types of frictional behavior were observed - steady sliding, a single stick followed by steady …
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Mechanisms of mesothelial tissue lubrication
… mesothelial cells covering the tissue surfaces. Normally, the pleural space, which is filled with fluid, is able to sustain continuous shear loading throughout its lifetime. To understand the mechanisms in preventing frictional damage on mesothelial tissue, we conducted experiments using …
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Experimental Investigation of the Tractive Performance of an Instrumented Off Road Tire in a Soft Soil Terrain
… and soil parameters, specifically wheel slip, normal load, inflation pres-sure, and soil compaction, as well as into the effect of combinations of such parameters on the tire and soil behavior. The results of such test data is exceedingly relevant, providing significant infor-mation to tire …
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Behavior of Gasketed Segmental Concrete Tunnel Lining
… as the circumferential joint shear stiffness and normal load (shoving force) increase, the lining behavior becomes closer to that of the no-joint lining.
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Characterization of cyclic plasticity type wear mechanism for titanium alloy, TI-6AL-4V on reciprocating sliding wear test
… of variable parameter set up which are applied normal load (50–200 N), number of cycles (5–20 cycles), and frequency (1– 2.5 Hz) on reciprocating sliding wear behavior are investigated. Frictional force resulted 60 – 80 N tangential force in range for those three parameter setup by both two …
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Tribological behavior of unfilled and carbon fiber reinforced polyether ether ketone/polyether imide composites
… test. The test variables were sliding speed and normal load. The wear mechanism of pure PEEK matrix was plowing and as the weight percentage of PEI in the blend was increased the wear mechanism changed to the generation of small particles. The wear rates of the unfilled PEEK/PEI blends were found …
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Empirical Analysis of Pneumatic Tire Friction on Ice
… and by imposing a desired tire slip; the normal load, camber angle, toe angle, and other testing configurations can also be pre-set, as required. Methods of and issues related to controlling the production of ice and maintaining the conditions of numerous factors for each trial run were …
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Strength of welded headed studs in ribbed metal deck on composite joists
… tested with three different deck geometries. A normal load apparatus models gravity loading in an attempt to represent full-scale joist behavior during the push-off test procedure. The results illustrate that the current AISC specifications (ASD 1989; LRFD 1986) do not accurately predict stud …
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Mechanics of Aggregated Alumina Suspensions: Behavior Under Shear and Compression
… demonstrate that the presence of a combined load alters the mechanical response for an aggregated suspension. Imposing a shear field on the particle network reduces the compressive strength of the network. The magnitude of this reduction in compressive strength is controlled by the …
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Tribo-corrosion maps for steels, titanium and titanium carbide materials
… The effects of change in sliding speeds and normal loads on wear behaviours were investigated for dry sliding conditions and tribo-corrosion maps were constructed with a tribo-system approach. The work was carried out in the following phases: In phase I, a fundamental study of the wear …
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AN ADAPTIVE AND SELF-COGNITIVE ACE FILTER
… multiarea inter-connected power system. Due to normal load changes, ACE signals are random, in nature and, contain wide band noise. Filtering of ACE signals to reduce the unwanted noise components is needed to reduce mechanical wear and provide smoother operation. The classical ACE filters now …
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Experimental Analysis of Empirical Model for Friction and Wear in Rubber on Dry Concrete
… were conducted on dry concrete by changing the normal load and sliding velocity for different rubber samples, both natural and SRB rubber, and found that model proposed by Dorsch and Archard had the best performance for friction and wear, respectively.
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The effect of molecular weight on the behavior of polystyrene coated steel disks under fretting conditions
… UNS G52100 steel balls at 20 Hz under 22.3 N normal load. Amplitudes of motion ranged from 100 ~m to 500 ~m. Coating life and friction force were measured. Coatings of <Mw>=207,700 showed maximum life at all amplitudes. Friction remained constant for all tests, and increasing amplitude …
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Biotribology: articular cartilage friction, wear, and lubrication
… of steers from a separate controlled study. The load, sliding speed, and traverse of the lower specimens were held constant as lubricant and test length were varied. Lubricants tested consisted of a phosphate buffered saline solution, bovine serum, and bovine synovial fluid. Synovial fluid as a …
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Behavior and Strength of Welded Stud Shear Connectors
… study the effects on stud strength of friction, normal load, position of studs in the ribs of steel deck, concrete strength, and stud properties. Stud diameters ranged from 3/8 in. to 7/8 in., deck heights ranged from 2 in. to 6 in., and both single and pairs of studs were tested. The push-out …
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The effects of thin polymeric surface films on fretting corrosion
… run with 52100 steel balls, 1040 steel plates, a normal load of 45 N (10 lbf), an amplitude of .33 mm (.013 in.) and a frequency of 20 Hz. PVC films were found to prevent fretting and metallic contact for 40 minutes. An electrochemical fretting corrosion mechanism has been suggested to explain …
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Test Results for Shaft Tracking Behavior of Pads in a Spherical Pivot Type Tilting Pad Journal Bearing
… point or line contact that operate under most normal load conditions, the pad tilting is due to a rocking motion which is not greatly influenced by friction. Hence this simplifying assumption might be acceptable. Heavier loading conditions, such as those typically encountered in gearboxes, …
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Effects of Freezing Temperature on Interface Shear Strength of Landfill Geosynthetic Liner
… shear stress was measured as a function of normal load to determine the values of interface frictional angle and adhesion of the geosynthetic interface. The variation of interface friction angle and shear strength for both frozen and unfrozen samples was observed. In the current work, we …
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