Search for dissertations about: "strain localisation"

Showing result 1 - 5 of 17 swedish dissertations containing the words strain localisation.

  2. 1. 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

  4. 2. Deformation behaviour and chemical signatures of anorthosites: : Examples from southern West Greenland and south-central Sweden

    Author : Henrik Svahnberg; Sandra Piazolo; Anders Scherstén; Holger Stünitz; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; anorthosite; plagioclase; deformation; strain localisation; fluid-rock interaction; electron backscatter diffraction EBSD ; Solid earth geology and petrology; Berggrundsgeologi och petrologi; Mineralogy; Petrology and Geochemistry; mineralogi; petrologi och geokemi;

    Abstract : Plagioclase is the most abundant mineral in the lower crust and it is thus important to constrain the behaviour of plagioclase during deformation. Anorthosites, which are plagioclase-rich rocks, are common in Archaean cratons but their origin and rheological importance is still debated. READ MORE

  5. 3. High strain rate deformation of Alloy 718, Influence of Microstructure on Mechanical Properties

    Author : Joakim Johansson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Alloy 718; Adiabatic shear localisation; Split-Hopkinson; Johnson-Cook;

    Abstract : Alloy 718 is a high temperature alloy, used where high temperature strength or oxidation resistance is required. As the alloy is precipitate heat treatable, it is possible to have a large variety of deformation and mechanical properties depending on microstructure. READ MORE

  6. 4. Multiscale granular mechanics: A neutron diffraction based experimental approach

    Author : Stefanos Athanasopoulos; Hållfasthetslära; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Granular media; Neutron diffraction; Plane-strain apparatus; Stress distribution; Localised stress-strain;

    Abstract : Granular media (i.e., assemblies of grains, containing voids), such as sand, are highly complex materials, possessing inherently heterogeneous structure and properties that are manifested by the mobility and interaction of their constituent particles. Despite having been widely studied for centuries (i. READ MORE

  7. 5. Strain-assisted corrosion cracking and growth rate inhibitors

    Author : Andrey P Jivkov; Mekanik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vacuum technology; vibration and acoustic engineering; Maskinteknik; hydraulik; vakuumteknik; vibrationer; akustik; materialteknik; Mechanical engineering; Material technology; Materiallära; Stress intensity factor; Inhomogeneous materials; Crack evolution; Stress corrosion cracking; Moving boundary; hydraulics;

    Abstract : A model for evolution of cracks as a result of strain-assisted corrosion is presented. The considered cracks possess a realistic geometry, where the tip region is an integral part of the crack surface instead of being a singular point. This geometry is either implicitly defined or is a consequence of crack nucleation from surface irregularities. READ MORE