Sökning: "elastic medium"

Visar resultat 11 - 15 av 38 avhandlingar innehållade orden elastic medium.

1. 11. Estimation of the Elastic Moduli of Porous Materials using Analytical Methods, Numerical Methods, and Image Analysis

   Författare :Thushan Chandrasiri Ekneligoda; Robert W. Zimmerman; Igor Tsukrov; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Civil engineering and architecture; Samhällsbyggnadsteknik och arkitektur;

   Sammanfattning : The effective bulk modulus and effective shear modulus of porous materials having various types of pore shapes are investigated, using both analytical and numerical methods. These solutions, and the scaling laws that are derived with the aid of these solutions, are then used to make predictions of the effective elastic moduli of some sandstones and ceramics, based on two-dimensional images of the pore space. LÄS MER

3. 12. Ab initio Investigation of Face-centered cubic High-Entropy Alloys

   Författare :Xun Sun; Levente Vitos; Torbjörn Björkman; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ab initio; high-entropy alloys; twinning; martensitic transformation; elastic properties; phase stability; Teknisk materialvetenskap; Materials Science and Engineering;

   Sammanfattning : High-entropy alloys (HEAs) represent a special group of solid solutions containing five or more principal elements. The new design strategy has attracted extensive attention from the materials science community. The design and development of HEAs with desired properties have become an important subject in materials science and technology. LÄS MER

4. 13. 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

5. 14. Numerical and laboratory studies of seismic properties and elements of rock fabric from the microscale to the macroscale

   Författare :Mohsen Bazargan; Bjarne Almqvist; Qin Wang; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Physical properties of rocks studied in the laboratory are useful to provide constraints on the dynamics of Earth?s interior. This may include direct constraints on in-situ seismic properties, such as elastic wave velocity measurements that can be compared to seismological data, or petrofabric indicators such as anisotropy of magnetic susceptibility (AMS). LÄS MER

7. 15. Atomic force microscopic studies of inner ear structure and mechanics

   Författare :Alexandra Zelenskaya; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Atomic force microscopy; indentation curves; mechanical properties; outer hair cells; shell-core model; electromotility; prestin; otoconia; tympanic membrane.;

   Sammanfattning : The transduction processes occurring in the inner ear, from sound induced vibration or head movements to nerve impulses sent to the brain, are to a large part dependent on the mechanical properties of the different components of this organ, especially the sensory hair cells. The function of the hearing organ is for example dependent on the unique mechanoelectric transduction properties of the cochlear outer hair cells (OHCs), which are able to respond to electrophysiological and mechanical stimulations by changing their shape and their mechanical properties. LÄS MER