Search for dissertations about: "Arne Melander"

Showing result 1 - 5 of 11 swedish dissertations containing the words Arne Melander.

  1. 1. Mechanical Properties of Resistance Spot Welds in Lightweight Applications

    Author : Davood Afshari; Zuheir Barsoum; Arne Melander; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Spot Weld; Aluminum alloy; Mechanical Properties; Finite Element; SRA - Production; SRA - Produktion;

    Abstract : This licentiate thesis is concerned with residual stresses in aluminum alloy 6061-T6 resistance spot welded joint. Several topics related to mechanical strength of welded structures are treated such as; nugget size and microhardness and microstructures of weld zone and their influence on mechanical strength of welded structure, failure load measurement using tensile-shear test, resistance spot welding simulation, residual stress measurement by X-ray diffraction method and analysis effect of welding parameters on the mechanical strength and the residual stresses. READ MORE

  2. 2. Digital process planning of joining by numerical models in the automotive industry

    Author : Oscar Andersson; Arne Melander; KTH; []
    Keywords : Production Engineering; Industriell produktion;

    Abstract : The automotive industry is striving towards reduction of greenhouse gas emission by reducing product weight and improving fuel efficiency of their products. The introduction of lightweight materials have imposed greater pressure not only on the product development but also on manufacturing systems. READ MORE

  3. 3. Process planning of resistance spot welding

    Author : Oscar Andersson; Arne Melander; Lars-Erik Svensson; KTH; []
    Keywords : ;

    Abstract : Manufacturing engineering in general has experienced an increased demand of process planning in order to optimize processes to reduce costs, environmental impact and increase time efficiency. Resistance spot welding (RSW) is a common and large-scale joining method in several manufacturing industries indicating significant potentials of efficient process planning. READ MORE

  4. 4. Effects of manufacturing chain on mechanical performance : Study on heat treatment of powertrain components

    Author : Johan Fahlkrans; Arne Melander; Bengt Lindberg; Stefan Jonsson; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Heat treatment; case hardening; carburising; induction hardening; gas quenching; tempering; straightening; fatigue strength; contact fatigue; fracture mechanics; Industrial Economics and Management; Industriell ekonomi och organisation; Production Engineering; Industriell produktion; Materials Science and Engineering; Teknisk materialvetenskap;

    Abstract : The increasing demands for lightweight designs with high strength call for improved manufacturing processes regarding heat treatment of steel. The manufacturing process has considerable potential to improve the mechanical performance and to obtain more reliable results with less variation. READ MORE

  5. 5. Very high cycle fatigue of tool steels

    Author : Vitaliy Kazymyrovych; Jens Bergström; Arne Melander; Karlstads universitet; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; fatigue; crack growth; ultrasonic testing; tool steels; inclusions; Materialteknik; Materials Engineering;

    Abstract : An increasing number of engineering components are expected to have fatigue life in the range of 107 - 1010 load cycles. Some examples of such components are found in airplanes, automobiles and high speed trains. READ MORE