Sökning: "Paul Åkerström"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden Paul Åkerström.

  1. 1. Material characterisation for simulation of press hardening

    Författare :Paul Åkerström; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : The growing effort to reduce vehicle weight and improve passive safety in the automotive industry has drastically increased the demand for ultra high strength steel components. There exist several production methods for such components, where the press hardening technique (hot stamping) is one of the most successful in producing complex components from boron steel. LÄS MER

  2. 2. Modelling and simulation of hot stamping

    Författare :Paul Åkerström; Luleå tekniska universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : The growing effort to reduce vehicle weight and improve passive safety in the automotive industry has drastically increased the demand for ultra high strength steel components. There are several production technologies for such components. LÄS MER

  3. 3. Modeling and Simulation of Weld Hot Cracking

    Författare :Joar Draxler; Lars-Erik Lindgren; Jonas Edberg; Paul Åkerström; Jesper Hattel; Luleå tekniska universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material Mechanics; Materialmekanik;

    Sammanfattning : Several alloy systems are susceptible to weld hot cracking. Weld hot cracking occurs by fracture of liquid films, normally grain boundary liquid films, at the late stage of the solidification of the weld. The cracks can be small and therefore difficult to detect by nondestructive test methods. LÄS MER

  4. 4. Microstructure and property models of alloy 718 applicable for simulation of manufacturing processes

    Författare :Marie Anna Moretti; Lars-Erik Lindgren; Paul Åkerström; Bijish Babu; Luleå tekniska universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Material characterisation; Material modelling; Alloy 718; Plasticity; Recrystallization; Solid Mechanics; Hållfasthetslära;

    Sammanfattning : Metallic materials experience a wide range of thermo-mechanical loads during manufacturing. These conditions influence the final mechanical and microstructural state of the work piece, which in turn de- termine the efficiency and service life of the structural component. LÄS MER

  5. 5. Plasticity modelling of nickel based super alloy Alloy 718

    Författare :Ted Sjöberg; Luleå tekniska universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : The ever growing demand on reduced fuel consumption in modern aircrafts puts high requirements on manufacturers to reduce weight in all parts of the aircraft. With a total weight of up to one fifth of an aircraft’s total operating weight, ways to decrease the weight of the engine systems are continuously sought. LÄS MER