Sökning: "incompressibility"

Visar resultat 1 - 5 av 11 avhandlingar innehållade ordet incompressibility.

1. 1. On computational modeling of sintering based on homogenization

   Författare :Mikael Öhman; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Computational homogenization; Multiscale; Mixed variational formulations; Incompressibility; FE2; Liquid phase sintering;

   Sammanfattning : Liquid-phase sintering is the process where a precompacted powder, “green body”, is heatedto the point where (a part of) the solid material melts, and the specimen shrinks while keeping(almost) net shape. In the case of hardmetal, the microstructure is defined by WC-Co-particleswith large pores, whereby molten Co represents the liquid phase. LÄS MER

3. 2. Predictions of Aerodynamically Induced Wind Noise Around Ground Vehicles

   Författare :Jonas Ask; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; side mirror; LES; incompressibility; Curle; CAA; air rush noise; low Mach number; ground vehicle; cavity;

   Sammanfattning : Over the last decade wind noise has with few exceptions consistently generated a constant or even growing level of customer complaints to automotive companies world-wide. This can partly be explained by a relatively greater focus on engine, power-train and tire noise combined with a growing need to reduce weight in future cars. LÄS MER

4. 3. Synthesis of Novel Polyhydroxyl Surfactants. Influence of the Relative Stereochemistry on Surfactant Properties

   Författare :Kristina Neimert-Andersson; KTH; []
   Nyckelord :Polyhydroxyl surfactants; Sugar surfactants; Stereoselective; Synthesis; Dihydroxylation; Langmuir monolayers; Chiral discrimination;

   Sammanfattning : This thesis deals with the synthesis and characterization ofnovel polyhydroxyl surfactants. The first part describes thesynthesis of a number of stereoisomers of a polyhydroxylsurfactant, and the second part concerns surface chemicalcharacterization. LÄS MER

5. 4. Toughness enhancement in transition metal nitrides

   Författare :Davide Giuseppe Sangiovanni; Valeriu Chirita; Lars Hultman; Sergey Simak; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cubic; transition metal nitrides; mechanical properties; ab initio; dft; toughness; ductility; electronic structure; Condensed matter physics; Kondenserade materiens fysik;

   Sammanfattning : Toughness enhancements can be induced in cubic-B1 transition metal nitride alloys by an increased occupation of the d-t2g metallic states. In this Licentiate Thesis I use density functional theory to investigate the mechanical properties of TiN and VN and of the ternaries obtained by replacing 50% of Ti and V atoms with M (M = V, Nb, Ta, Mo, and W) to form ordered structures with minimum number of inter-metallic bonds. LÄS MER

7. 5. Modelling the passive mechanical properties of arteries

   Författare :Jonas Stålhand; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : This thesis concerns the modelling of passive mechanical properties of arteries. An artery is characterised by large nonlinear deformation, anisotropy and incompressibility. In addition, it is subjected to a residual stress when the applied load is removed. All this combined makes it complex to derive appropriate mechanical models. LÄS MER