Sökning: "Johan Tillberg"

Hittade 4 avhandlingar innehållade orden Johan Tillberg.

  1. 1. Elastic-Plastic Fracture Mechanics and RCF in Rails

    Författare :Johan Tillberg; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; RCF; elastic-plastic fracture mechanics; Material-forces; Multiple crack interaction;

    Sammanfattning : This thesis concerns issues regarding the modeling and numerical simulation of singularcracks and their propagation in the context of Rolling Contact Fatigue (RCF) in rails.Typically, such cracks are associated with squats and head-checks in the rail head. LÄS MER

  3. 2. Elastic-plastic fracture mechanics - Application to rolling contact fatigue in rails

    Författare :Johan Tillberg; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; FEM; rolling contact fatigue; railway mechanics; Elastic-plastic fracture mechanics; material forces;

    Sammanfattning : Railway structures represent complex mechanical problems involving wave propagation, plastic deformations and material degradation. The wheel-rail contact loads subject the material to repeated cycles of complex stress states resulting in rolling contact fatigue (RCF). LÄS MER

  4. 3. Constraining the timing of veins, faults and fractures in crystalline rocks by in situ Rb-Sr geochronology

    Författare :Mikael Tillberg; Henrik Drake; Mats E. Åström; Thomas Zack; Johan Hogmalm; Bjarne Almqvist; Linnéuniversitetet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; geochronology; brittle deformation; crustal fluids; mineral precipitation; ancient microbial activity; Precambrian craton; Scandinavia; Natural Science; Naturvetenskap;

    Sammanfattning : Precambrian cratons are continent cores archiving the oldest crustal histories on Earth. The crystalline basement of cratons is typically characterized by complex arrays of multiple fracture and fault generations hosting minerals formed by fluids flowing through fracture networks. LÄS MER

  5. 4. Dionysos på Årsta torg : färgfrågan i svensk efterkrigsarkitektur

    Författare :Mari Ferring; Johan Mårtelius; Margareta Tillberg; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; architecture; history of architecture; colour in architecture; architectural debate; modernism; Dionysus; environmental colour design; cultural history; post-war architecture; monumental art; community centre; Erik Ahlsén; Tore Ahlsén; Asger Jorn; Årsta; Stockholm; Sweden; 20th century.; Architecture; Arkitektur;

    Sammanfattning : The overall aim of the thesis is to discuss cultural significations and notions of colour in Swedish post-war architecture. More specifically, the purpose is to analyse the question of colour in architecture linked to the polychrome walls of Årsta Community Centre, including background, intentions, cultural context and debate. LÄS MER