Search for dissertations about: "Asperity contact"

Showing result 1 - 5 of 22 swedish dissertations containing the words Asperity contact.

2. 1. On the asperity point load mechanism for rolling contact fatigue

   Author : Johan Dahlberg; Bo Alfredsson; Sören Sjöström; KTH; []
   Keywords : Rolling contact fatigue; Spalling; Asperity contact; Point load; Micro-cracks; Traction; Applied slip; TECHNOLOGY; TEKNIKVETENSKAP;

   Abstract : Rolling contact fatigue is a damage process that may arise in mechanical applications with repeated rolling contacts. Some examples are: gears; cams; bearings; rail/wheel contacts. The resulting damage is often visible with the naked eye as millimeter sized surface craters. READ MORE

4. 2. Modelling of surface initiated rolling contact fatigue crack growth using the asperity point load mechanism

   Author : Dave Hannes; Bo Alfredsson; Anders Ekberg; KTH; []
   Keywords : rolling contact fatigue; spalling; asperity; fatigue crack path; fatigue crack growth; mode I; plane mixed-mode; TECHNOLOGY; TEKNIKVETENSKAP;

   Abstract : .... READ MORE

5. 3. 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

6. 4. Rough surfaces in contact : artificial intelligence and boundary lubrication

   Author : Marco Rapetto; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Machine Elements; Maskinelement;

   Abstract : Interacting surfaces are found in mechanical systems and components. Since engineered surfaces are not perfectly smooth, only a fraction of the nominal surface area is actually in contact. This fraction is denoted as the real area of contact, Ar, and is formed by the sum of the contact spots between the two touching surfaces. READ MORE

7. 5. The effect of scale on the morphology, mechanics and transmissivity of single rock fractures

   Author : Nader Fardin; KTH; []
   Keywords : Anisotropy; Aperture; Asperity degradation; Contact area; Finite Element Method FEM ; Flow analysis; Fractals; Fracture morphology; Heterogeneity; Stress-deformation; Surface roughness; Roughness-Length method; Scale dependency; Stationarity; Transm;

   Abstract : This thesis investigates the effect of scale on themorphology, mechanics and transmissivity of single rockfractures using both laboratory and in-situ experiments, aswell as numerical simulations. Using a laboratory 3D laserscanner, the surface topography of a large silicon-rubberfracture replica of size 1m x 1m, as well as the topography ofboth surfaces of several high-strength concrete fracturereplicas varying in size from 50mmx50mm to 200mm x 200mm, werescanned. READ MORE