Sökning: "Colonies"

Visar resultat 11 - 15 av 121 avhandlingar innehållade ordet Colonies.

  1. 11. Influence of Material Variations on Machinability - Machining Difficult-to-Machine Alloys

    Författare :Stefan Cedergren; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Alloy 718; Superalloys; Ti-6Al-4V; segmented chip; 316L;

    Sammanfattning : The aim of this study is to investigate the effect of work material variations on machinability. Improved knowledge in this respect supports the development of sustainable production both from resource and economical points of view.The properties of work materials vary greatly depending on how they were manufactured. LÄS MER

  3. 12. Mechanical Properties of Gamma Titanium Aluminides

    Författare :Viktor Recina; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; microstructure; intermetallic compound; tensile properties; diffusion bonding; sample preparation; low cycle fatigue; fractography; gamma titanium aluminide; mechanical properties;

    Sammanfattning : In recent years intermetallic compounds have attracted a great deal of attention as structural materials. Among the intermetallics, gamma titanium aluminides (.gamma.-TiAl) are considered to be closest to application. LÄS MER

  4. 13. Light induced destruction of indole-3-acetic and some physiological effects on one of its metabolites, 3-methyleneoxindole

    Författare :Punam Bhatnagar; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Studies conducted on Lemma gibba in sterile nutrition medium with labelled indole-3-acetic acid (IAA-1- 14C), confirmed that IAA is highly photosensitive in aqueous solutions. About 80 % of the IAA was decarboxylated within 24 h of exposure to fluorescent light. LÄS MER

  5. 14. On multiscale modeling of pearlitic steel

    Författare :Erik Lindfeldt; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cementite; crystal plasticity; Pearlite; multiscale modeling; computational homogenization; digital image correlation; ferrite; in-situ SEM;

    Sammanfattning : By studying pearlitic steels using a scanning electron microscope it can be observed that pearlite is a two-phase material with cementite lamellae embedded in a matrix of ferrite. The cementite is commonly described as being stiff and brittle in comparison to the ferrite which is considered to have a soft and ductile mechanical behavior. LÄS MER

  7. 15. Computational Multiscale Modeling of Pearlitic Steel

    Författare :Erik Lindfeldt; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Multiscale modeling; homogenization; pearlite; crystal plasticity;

    Sammanfattning : The objective of this thesis is to investigate the possibilities to describe the mechanical behaviorof a pearlitic steel by using computational homogenization, or multiscale modeling. The proposed model contains three scales: the engineering macroscale, the mesoscale representing the colonies of the pearlite and the microscale containing the individual cementite lamellae and the ferrite matrix. LÄS MER