Search for dissertations about: "cyclic hardening softening"

Showing result 1 - 5 of 15 swedish dissertations containing the words cyclic hardening softening.

  2. 1. Modelling of the cyclic behaviour of superalloys

    Author : Rebecka Brommesson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; FEM; kinematic hardening; Cyclic plasticity; TMF; superalloy;

    Abstract : In the aviation industry today there is a trend of increasing operating temperatures in turbine engines. The advantages with higher temperatures in the engines are improved performance and efficiency. READ MORE

  4. 2. Monotonic and Cyclic Plastic Deformation of High-Strength Aluminium Alloys

    Author : Magnus Hörnqvist Colliander; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strain rate effects; Heat treatment; Dynamic strain ageing; Precipitation hardening; Low cycle fatigue; AA7030; Plastic deformation; Temperature effects; EN AW-7030; Al-Zn-Mg; Strain hardening; Mechanical properties; Dynamic precipitation.;

    Abstract : Dynamic strain ageing (DSA) and dynamic precipitation (DP) are two, closely interrelated, phenomena arising from the dynamic interaction between mobile solute atoms and dislocations. The occurrence of DSA and DP is confined to specific ranges of strain rate and temperature, and aluminium alloys are generally prone to experience DSA and DP already at ambient temperatures and conventional strainrates. READ MORE

  5. 3. Modelling of cyclic and viscous behaviour of materials for gas turbine applications - with a view towards fatigue life predictions

    Author : Rebecka Brommesson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mean stress relaxation; parameter identification; Haynes 282; viscoplasticity; Ti-6242; fatigue life prediction; intergranular fracture; micromechanical model; sensitivity analysis; finite element method; Plasticity; crystal plasticity; cyclic hardening softening;

    Abstract : Critical jet engine components are exposed to high temperatures. These components are also required to have low weight in order to reduce fuel consumption and allow for heavier payload, higher speed, and longer flight distance of the aircraft. READ MORE

  6. 4. Modeling of Inelastic Response of Metals with Emphasis on Cyclic Viscoplasticity

    Author : Magnus Ekh; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; large strains; integration; anisotropy; plasticity; creep; viscoplasticity; kinematic hardening; metals; damage; calibration;

    Abstract : This thesis is concerned with the continuum modeling of the macroscopic behavior of engineering metals, in particular as part of life prediction strategies. Focus is primarily placed on the formulation and numerics of models for cyclic rate-dependent response. READ MORE

  7. 5. The Precipitation and Deformation Behaviour of Superaustenitic Stainless Steel

    Author : Stefan Heino; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; precipitation; low cycle fatigue TEM; slip behaviour; superaustenitic stainless steel; EDS; cyclic deformation; HAZ; tungsten; molybdenum;

    Abstract : The present study concerns the precipitation behaviour and the deformation characteristics of a superaustenitic stainless steel with composition Fe-24Cr-22Ni-7.3Mo-0.5N (wt%). Regarding precipitation, also materials with Mo partially replaced by W have been studied. READ MORE