Sökning: "Shear band"

Visar resultat 1 - 5 av 27 avhandlingar innehållade orden Shear band.

1. 1. On the Modeling of Porous Media with Emphasis on Localization

   Författare :Jonas Larsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; embedded band; material instability; bifurcation; FEM; softening plasticity; consolidation; shear band; porous media; localization;

   Sammanfattning : The mechanics of porous media is nowadays relevant in a broad spectrum of engineering applications. In the case of geomaterials, the description of the mechanical behavior is complicated by the fact that the deformation characteristics involve (strain) localization, which is indeed the main topic of this thesis. LÄS MER

3. 2. Fracture behaviour and related microstructures of tool steels parted-off at high rates of strain

   Författare :Kristina Ryttberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; high-velocity parting-off; adiabatic cutting; high strain-rate deformation; TEM; steel; adiabatic shear band;

   Sammanfattning : Increasing steel prices and environmental aspects have put forward the demand to reduce material consumption in manufacturing industry and near-net-shape manufacturing techniques have thus become increasingly important. High-velocity parting-off, or adiabatic cutting, has shown to result in very low material waste as well as narrow dimensional tolerances of parted-off samples. LÄS MER

4. 3. Microstructural changes in high strength steels exposed to large deformation and high strain rates

   Författare :Kristina Ryttberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; deformation mechanisms; high-velocity forming; high-velocity parting-off; adiabatic shear band; cold ring rolling; TEM; steel;

   Sammanfattning : Increasing steel prices and environmental aspects have put forward the demand to reduce material consumption and energy usage in manufacturing industry and near-net-shape manufacturing techniques have thus become increasingly important. High-velocity parting-off,high-velocity forming and cold ring rolling are three such manufacturing methods that exhibit great potentials in terms of material waste reduction. LÄS MER

5. 4. Ductile failure and rupture mechanisms in combined tension and shear

   Författare :Imad Barsoum; Jonas Faleskog; Björn Skallerud; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Other engineering mechanics; Övrig teknisk mekanik;

   Sammanfattning : This licentiate thesis is generally concerned with the ductile failure and rupture mechanisms encountered under combined tension and torsion loading. In the first part entitled Paper A, an experimental investigation of the rupture mechanisms in a mid-strength and a high strength steel was conducted employing a novel test configuration. LÄS MER

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

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

   Sammanfattning : 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. LÄS MER