Sökning: "elastic deformation"

Visar resultat 16 - 20 av 171 avhandlingar innehållade orden elastic deformation.

1. 16. Effects of deep excavations in soft clay on the immediate sourroundings-Analysis of the possibility to predict deformations and reactions against the retaining system

   Författare :Anders Kullingsjö; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MIT-S1; Sheet pile wall; Soil-structure interaction; Strain; Stress; Ground surface settlement; Finite element method; Case history; Shear test; Shear strength; Pore pressure; Analysis; Constitutive models; Plane strain; Elastoplasticity; Laboratory tests; Factor of safety; Stiffness; e-ADP; Earth pressure; Anisotropy; Soft Clay; Deep excavation; Retaining wall; Shear stress; Deformation;

   Sammanfattning : When excavating in an urban environment, the evaluation of the magnitude and distribution of ground movements is an important part of the design process, since excessive movements can damage adjacent buildings and utilities. In order to minimize movement of the surrounding soil, a retaining wall support system is used for deep excavations to provide lateral support. LÄS MER

3. 17. Torque and angle controlled tightening over the yield point of a screw

   Författare :Göran Toth; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; clevis; permanent elongation factor; Monte-Carlo simulations; bolted screwed joints; final preload; torque and angle controlled tightening; extreme-value method; plastic deformation; Taylor s series expansions; plastic spring constant of the screw; yield; elastic angle; momentary elongation factor; snug torque; torque controlled tightening; final torque; turn-of-nut method;

   Sammanfattning : .... LÄS MER

4. 18. Hardening concrete : measurments and evaluation of non-elastic deformation and associated restraint stresses

   Författare :Hans Hedlund; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Structural Engineering; Konstruktionsteknik;

   Sammanfattning : If a structural member of hardening concrete is restrained to some degree against expansion and contraction during the heating phase of the hydration process and the subsequent contraction phase, stresses will be induced. The issue of primary interest is whether or not these induced stresses will lead to cracking. LÄS MER

5. 19. Analysis of Response and Development of Permanent Deformation of Unbound Granular Materials Using a Testing Box Technique

   Författare :Ebrahim Parhamifar; Trafik och väg; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Unbound granular materials; testing box; response; permanent deformation;

   Sammanfattning : The main objective of this thesis is to study the response and development of permanent deformation in unbound granular materials, theoretically and experimentally. A testing box technique is used here to more closely simulate the behaviour of unbound aggregates subjected to external vertical loading. LÄS MER

7. 20. Elastic-plastic fracture mechanics - Application to rolling contact fatigue in rails

   Författare :Johan Tillberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; FEM; rolling contact fatigue; railway mechanics; Elastic-plastic fracture mechanics; material forces;

   Sammanfattning : Railway structures represent complex mechanical problems involving wave propagation, plastic deformations and material degradation. The wheel-rail contact loads subject the material to repeated cycles of complex stress states resulting in rolling contact fatigue (RCF). LÄS MER