Sökning: "constant normal stiffness"

Visar resultat 1 - 5 av 12 avhandlingar innehållade orden constant normal stiffness.

1. 1. Mechanical and Hydromechanical Behaviour of Hard Rock Joints. A laboratory study

   Författare :Roger Olsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; laboratory shear tests; constant normal stiffness; rock mechanics; hydromechanical behaivour; rock joints; replicas;

   Sammanfattning : As a consequence of rock engineering works, the rock mass will deform due to stress changes. Most deformation occurs in the rock joints, in form of normal and shear strains. These deformations will also change the void geometry and thereby the joint aperture and fluid flow. LÄS MER

3. 2. Three-Dimensional Load-Deformation Relationships of Arbitrarily Loaded Coiled Springs

   Författare :Lars Lindkvist; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; extended stiffness model; helical spring; non-linear deformation; stiffness matrix; coiled spring; arbitrary load; large deformation; three-dimensional;

   Sammanfattning : This paper reports the development of a computer based tool that can be used to predict the three-dimensional load-deformation relationships of arbitrarily loaded coiled springs. The non-linear deformation of the spring is calculated by dividing the spring into small elements for which the load-deformation relationships can be considered to be linear. LÄS MER

4. 3. New Methods for Reducing Ground-Borne Noise in Buildings above Railway Tunnels

   Författare :Osama A. B. Hassan; KTH; []
   Nyckelord :Ground-borne noise; railway noise; in-plane waves; wave-guides; scattering; propagation constant; input mobility; elastic stratum; dual integral equations;

   Sammanfattning : The rapid expansion of major cities in the west Europeancountries has accentuated the need to exploit every potentialsite for new establishments, e.g. areas over train tunnels andnear railway tracks in general. LÄS MER

5. 4. Non-invasive assessment of dynamic properties in human arteries : with special reference to gestation and diabetes

   Författare :Jie Hu; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Acetylcholine; Adolescents; Aorta; Diameter waveforms; Diameter pulse waves; Echo tracking system; Fetal behavioural state; Fetal breathing movements; Gestational diabetes mellitus; Impending birth; Insulin-dependent diabetes mellitus; Laser Doppler; Microcirculation; Pregnancy; Pulse wave velocity; Vascular endothelium; Vascular stiffness; Ultrasound;

   Sammanfattning : Background: The important role played by the intrinsic properties of central arteries in cardiovascular physiology and pathology has been increasingly recognised. Several circulatory disorders are associated with increased arterial stiffness. LÄS MER

7. 5. Numerical modelling of jointed rock masses by distinct element method for two- and three-dimensional problems

   Författare :Lanru Jing; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

   Sammanfattning : The mechanical behaviour of a jointed rock mass is strongly, and sometimes dramatically, affected by the behaviour of the discontinuities present in jointed rock mass. In many cases, preferential failures are dominated or defined by the natural discontinuities present in the neighborhood of engineering engineering works. LÄS MER