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Showing 1 to 20 of 54 for “"fretting"”.
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Fretting fatigue analysis and palliatives
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering; and, (Nav.E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1999.
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Fretting Fatigue Characterization of Steel Bolted Connections
Fretting fatigue is a multiaxial stress problem, which occurs on contacting components under normal pressure while they are subjected to cyclic loads and oscillatory relative movement of small amplitudes at the same time. Slip-critical bolted connections are commonly used in repetitive loading …
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A study of tribopolymerization under fretting conditions
… can occur under conditions of fretting contact. Using a laboratory test consisting of oscillating hard steel balls loaded against flat steel or aluminum disks, effects of various monomers on friction, wear, and surface film formation were determined. Monomers, capable of …
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An investigation into the mechanisms of fretting fatigue
… of the mechanismsinvolved in the process of fretting fatigue.The design and construction of a rig to enable acontrolled fretting action to be applied to a push-pulltype of fatigue specimen is discussed. Specialconsideration is given to the form of the fretting contactgeometry with regard to …
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An Analysis of Fretting Damage on Fatigue Strength
Made available in DSpace on 2014-12-12T00:25:57Z (GMT). No. of bitstreams: 1 7500473.pdf: 2604822 bytes, checksum: a5829299e4336fde63ae26d923d57102 (MD5) Previous issue date: 1974
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A study of fretting fatigue in aircraft components
… and experimental approaches to the problem of fretting fatigue in materials systems relevant to aircraft components. The basic contact mechanics for fretting fatigue in a sphere-plane contact geometry are reviewed. Various elastic criteria for predicting fretting failure are discussed; selected …
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Fretting corrosion and contact resistance of edge-card connectors
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1984.
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Friction and degradation of rubber coatings under fretting conditions
… mechanisms of thin rubber coatings used as fretting corrosion inhibitors. Two elastomers, polyurethane and styreneethylene-butylene (SEBS), were investigated. The mechanisms of wear were studied by analyzing wear scars with optical microscopy. Friction mechanisms were investigated using …
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A study of fretting fatigue incorporating sharp corner contact geometry.
Fretting fatigue occurs when components are in contact and subjected to cyclic loads or vibrations. The following research programme investigates the fretting fatigue phenomenon using a specific flat contact geometry encompassing sharp comers. The pressure distribution at the contact interface is …
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A unified fracture mechanics approach to fretting fatigue crack growth
… the adequacy of a modeling approach of fretting fatigue for a sphere-on-flat geometry entirely based on fracture mechanics. All stages of damage evolution, from initiation to failure, are encompassed within the framework of fracture mechanics, in contrast with the general use of stress …
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The effects of thin polymeric surface films on fretting corrosion
… is to determine if polymer films can prevent fretting between two metals, and if they can, what the protection mechanisms are. This research is a part of fretting corrosion studies currently funded by the Army Research Office. Four thermoplastic polymers were tested for their effectiveness. …
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A study of chlorinated polymer coatings in a fretting interface
… and polyvinylidenechloride (PVDC) degrade in a fretting interface. Polymer coated 52100 steel balls are fretted against a polished 1045 steel plate for 30 minutes in air and nitrogen at 25-30 percent and greater than 95 percent relative humidity. ESCA analysis is used to determine interface …
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A COMPUTATIONAL APPROACH TO FRETTING WEAR PREDICTION IN TOTAL HIP REPLACEMENTS
… that can occur in mechanical coupling design. “Fretting wear” occurs where surfaces in contact are subjected to oscillating load and very small relative motion over a period of time. Fretting has been observed in many mechanical interactions and is known to be a reason for failure in many …
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Fretting fatigue Behaviour of Inconel 718 at room and high Temperature
… characterise the material's response to fretting damage. To this end, a cylindrical contact configuration was used, consisting of a rectangular cross-section "dog-bone" specimen pressed against a cylindrical pad. The setup was assembled using a device commonly referred to as a “fretting …
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Coupled fluid structure simulations for application to grid-to-rod fretting
Grid-to-rod fretting (GTRF) has been the major cause of fuel leakage in Pressurized Water Reactors (PWRs) for the past ten years. It is responsible for over 70% of the fuel leaking in PWRs in the United States. The Consortium for Advanced Simulation of Light Water Reactors (CASL) has identified …
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An experimental study of fretting corrosion at a bearing/cartridge interface
A device has been built to study fretting corrosion phenomena at a bearing/cartridge interface. The research is a continuation of a larger study funded by the Naval Research Laboratory. Its main objective is to determine the important parameters influencing fretting and fretting corrosion in …
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Infrared measurements of surface temperatures during oscillating/fretting contact with ceramics
… generated by friction during osculating/fretting contact were measured using an infrared microscope coupled to a digital data acquisition system developed at Virginia Polytechnic Institute and State University. The contact geometry consisted of a stationary test specimen loaded against a …
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Moisture and stress effects on fretting between steel and polyimide coatings
Fretting of solvent cast polyimide coatings was investigated in a ball-on-flat geometry as a function of relative humidity. Polyimides were synthesized from benzophenone tetracarboxylic dianhydride (BTDA) and bisanline (Bis P), 6-fluoro bis dian hydride (6FDA) and Bis P, and pyromellitic …
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Analytical investigation of fretting wear with special emphasis on stress based models
<p>Fretting refers to the minute oscillatory motion between two surfaces in contact under an applied normal load. It can cause either surface or subsurface initiated failure resulting in either fatigue or wear or both. Two distinct regimes – partial slip and gross slip are typically observed in …
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An Experimental Study of Fretting Corrosion and Its Influence on Fatigue Strength
Made available in DSpace on 2014-12-09T17:13:42Z (GMT). No. of bitstreams: 1 6801839.pdf: 6043410 bytes, checksum: 622ff1d1b6351087d70bce0c6a28430e (MD5) Previous issue date: 1967
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