Sökning: "static friction"

Visar resultat 1 - 5 av 45 avhandlingar innehållade orden static friction.

  1. 1. Surfaces Designed for High and Low Friction

    Författare :Ulrika Pettersson; Staffan Jacobson; Roland Larsson; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; tribology; friction; surface texture; surface design; low friction; high friction; boundary lubrication; DLC; embossing; Materialvetenskap; Materials science; Teknisk materialvetenskap;

    Sammanfattning : This thesis comprises tribological studies of extremely well-defined surfaces of different designs. Both low-friction and high-friction surfaces were manufactured and experimentally evaluated.In the low-friction studies, lithography and anisotropic etching of silicon was first used as a texturing technique. LÄS MER

  3. 2. Studies of Nanowire Friction using AFM-based Manipulation

    Författare :Gabriela Conache; Fasta tillståndets fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nanomanipulation; AFM; Nanowires; Nanotribology; Friction; Nanotechnology.;

    Sammanfattning : In this thesis we present friction studies on InAs nanowires pushed laterally across surfaces by an AFM tip. The contact length in the direction of movement is of the order of a few tens of nanometers, and is thus comparable to that found in existing point-contact studies, but perpendicular to the motion the wire can be several microns in length. LÄS MER

  4. 3. Mechanisms and Phenomena in Braking and Gripping

    Författare :Lars Hammerström; Staffan Jacobson; XXX XXX; Uppsala universitet; []
    Nyckelord :Materials science; Friction; Brake; Texture; Squeal; Materialvetenskap;

    Sammanfattning : Applications relying on a high static friction include various types of fixtures, couplings, bolted joints, torsion joints, etc. The common characteristic of these applications is that they rely on the friction force to maintain the relative position of two mating surfaces. LÄS MER

  5. 4. Force measurements using scanning probe microscopy : Applications to advanced powder processing

    Författare :Anders Meurk; KTH; []
    Nyckelord :atomic force microscope; AFM; SPM; van der Waals interaction; DLVO-theory; surface forces; colloidal probe; force curve; friction; adhesion; stick-slip; cantilever; calibration; spring constant; silicon nitride; iron; silica;

    Sammanfattning : The object of this thesis is to apply scanning probemicroscopy (SPM) to the field of advanced powder processing.Measurement of interparticle surface forces at conditionsrelevant to ceramic processing has been performed together withthorough studies of powder friction. LÄS MER

  7. 5. Heat transfer phenomena and mould flux lubrication in continuous casting of steel

    Författare :Akira Yamauchi; KTH; []
    Nyckelord :Heat Transfer; Thermal Conductivity; Contact Resistance; Mould Flux; Solidification; Lubrication; Infiltration; Friction; Shear Stress; Modeling; Crystallization; Rupture Strength; Solidus; High-Speed Casting; Viscosity; Elasticity; Uniform Cooling;

    Sammanfattning : Overall thermal resistance of the mould flux was measured tomake clear the influence of the mould flux properties on theheat transfer behavior in continuous casting, especiallythermal conductivity and the formation of air gaps in thisstudy. From the investigation of the effect of the mouldsurface temperature and physical properties of the mould fluxon heat transfer through the flux film, following knowledge hasbeen obtained. LÄS MER