Search for dissertations about: "bo alfredsson"

Showing result 1 - 5 of 15 swedish dissertations containing the words bo alfredsson.

  2. 1. A study on contact fatigue mechanisms

    Author : Bo Alfredsson; KTH; []
    Keywords : contact fatigue mechanism; spall; spalling; surface crakc; sub-surface crack; elesto-plastic indentation; contact compliance measurement; TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract : Surfaces subjected to rolling and sliding contacts maysuffer from contact fatigue. This thesisdeals with solidmechanic aspects of contact fatigue including the descriptionand verificationof explaining mechanisms. The new mechanism forsurface initiated contact fatigue is basedon tensile surfacestresses from local asperity contacts. READ MORE

  4. 2. An experimental and numerical study on contact fatigue initiation

    Author : Bo Alfredsson; KTH; []
    Keywords : TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract : .... READ MORE

  5. 3. Churning losses and efficiency in gearboxes

    Author : Martin Andersson; Ulf Olofsson; Stefan Björklund; Ulf Sellgren; Bo Alfredsson; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gears; efficiency; temperature; running-in; assembly; torque loss; surface roughness;

    Abstract : Efficient transmissions systems are key to producing competitive motor vehicles that have a smaller environmental impact. Gears are the main components in vehicle transmissions and although they are already highly efficient, there is still room for improvement. READ MORE

  6. 4. Life prediction and mechanisms for the initiation and growth of short cracks under fretting fatigue loading

    Author : Alessandro Cadario; Bo Alfredsson; David Nowell; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fretting fatigue; Fretting experiment; Friction evolution; Fatigue crack initiation; Fatigue crack growth; Short crack; Non-destructive testing; Acoustic emission; Potential drop; Shot peening; Stress relaxation; Crack closure; Finite element method; Titanium alloy.; Engineering mechanics; Teknisk mekanik;

    Abstract : Fretting fatigue is a damage process that may arise in engineering applications where small cyclic relative displacements develop inside contacts leading to detrimental effects on the material fatigue properties. Fretting is located in regions not easily accessible, which makes it a dangerous phenomenon. READ MORE

  7. 5. A numerical and experimental investifgation on surface and sub-surface initiation of contact fatigue cracks at cylindrical contacts

    Author : Johan Dahlberg; Bo Alfredsson; Johas Ringsberg; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Other engineering mechanics; Övrig teknisk mekanik;

    Abstract : .... READ MORE