Sökning: "Cyclic loading"

Visar resultat 11 - 15 av 124 avhandlingar innehållade orden Cyclic loading.

1. 11. Mechanical Analysis of Melamine-Formaldehyde Composites

   Författare :Per-Ola Hagstrand; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; melamine-formaldehyde; damage; composites; alumina trihydrate; stiffness modelling; cyclic loading; rheokinetics; flax fibres; in-situ SEM;

   Sammanfattning : Planar random fibre composite materials based on melamine-formaldehyde (MF), one of the hardest and stiffest isotropic polymers that is known, have been developed recently on an industrial scale. In this thesis the mechanical behaviour of these materials is systematically investigated for the first time. LÄS MER

3. 12. Simulation of track settlement in railway turnouts-An iterative approach

   Författare :Xin Li; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; track settlement; Railway switch and crossing; cyclic loading; visco-plasticity; vehicle‒track interaction; 3D finite element analysis; granular material; ballast;

   Sammanfattning : In this thesis, a methodology for simulation of track settlement in railway turnouts (switches andcrossings, S&C) is presented. The methodology predicts the accumulated settlement for a given setof traffic loads using an iterative and cross-disciplinary procedure. LÄS MER

4. 13. Constitutive modeling of concrete subjected to monotonic and cyclic loading

   Författare :Rasmus Rempling; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : .... LÄS MER

5. 14. Influence of neuromodulators and mechanical loading on pathological cell and tissue characteristics in tendinosis

   Författare :Gloria Fong; Patrik Danielson; Alex Scott; Ludvig Backman; Paul Ackermann; Umeå universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; substance P; acetylcholine; transforming growth factor; neuromodulators; mechanical loading; tendinosis; anatomi; Human Anatomy;

   Sammanfattning : Background: Tendinosis is a painful chronic, degenerative condition characterized by objective changes in the tissue structure of a tendon. Hallmark features in tendinosis tendons include increased number of cells (hypercellularity), extracellular matrix (ECM) degradation and disorganized collagen. LÄS MER

7. 15. Deformation Behaviour of Near Fully Pearlitic Railway Steels During Monotonic and Cyclic Loading

   Författare :Niklas Köppen; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LCF; low cycle fatigue; Near fully pearlitic steels; work hardening; microstructure; tensile deformation; medium carbon steel;

   Sammanfattning : The main conclusions that could be drawn from the present work are that the deformation behaviour of fully and near fully pearlitic steels is very similar and that a combination of low temperature, prestraining and high deformation rates is critical for the performance. This was shown from microscopy studies, tensile, impact and low cycle fatigue (LCF) testing. LÄS MER