Sökning: "Coulomb friction"

Visar resultat 1 - 5 av 19 avhandlingar innehållade orden Coulomb friction.

1. 1. Existence theorems for noncoercive incremental contact problems with Coulomb friction

   Författare :Andreas Rietz; Lars-Erik Andersson; Jaroslav Haslinger; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematics; Coulomb friction; noncoercive; normal compliance; mollification; MATEMATIK; MATHEMATICS; MATEMATIK;

   Sammanfattning : Friction is a phenomenon which is present in most mechanical devices and frequently encountered in everyday life. In particular, understanding of this phenomenon is important in the modelling of contact between an elastic object and an obstacle. LÄS MER

3. 2. Existence results for noncoercive incremental contact problems with Coulomb friction

   Författare :Andreas Rietz; Marius Cocou; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Friction is a phenomenon which is present in most mechanical devices and frequently encountered in everyday life. Noncoercive incremental contact problems with Coulomb friction constitute an important class of friction problems due to their frequent occurrence in mechanical engineering. LÄS MER

4. 3. Modelling of compaction of metal powder and damage accum ulation due to fatigue in powder materials

   Författare :Joakim Cedergren; Mekanik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydraulik; vakuumteknik; vibrationer; akustik; Maskinteknik; hydraulics; Mechanical engineering; friction; FEM; numerical modelling; continuum mechanics; fatigue loading; powder compaction; vacuum technology; vibration and acoustic engineering;

   Sammanfattning : This thesis addresses powder manufactured (P/M) components, with special attention to the compaction process and to the sensitivity to damage accumulation due to fatigue within powder compacted specimens. Three dimensional simulations of the compaction process have been performed, using an explicit dynamic dilatant finite strain finite element code supplemented with the effects from contact friction within the die, modelled by Coulomb friction. LÄS MER

5. 4. On Rolling Variators, A study of power transmitting rolling variators when changing speed ratio

   Författare :Göran Brännare; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; friction drives; traction drives; variators; traction; CVT; speed ratio change; rolling traction trnasmissions; continously variable transmissions; rolling contact drives; transmission ratio change;

   Sammanfattning : The introduction of the concept Rolling Variators is proposed for rolling contact continuously variable transmission.A theoretical study of rolling variators when changing the speed ratio during power transmission is presented. LÄS MER

7. 5. Nonlinear Numerical Simulations of Interactions Between Ice Rubble and Structure

   Författare :Aniket Patil; Andrzej Cwirzen; Björnar Sand; Lennart Fransson; Knut Vilhelm Høyland; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ice mechanics; ice rubble; sea ice ridges; punch through test; shear box test; friction coefficient; cohesive element method; smoothed particle hydrodynamics; continuous surface cap model; numerical modelling; Byggkonstruktion; Structural Engineering;

   Sammanfattning : This research is focused on three distinct but interconnecting topics:1) investigation of physical and mechanical properties of ice rubble, 2) material modelling of ice rubble, 3) numerical simulation of the interaction between ice rubble structure interaction. large scatter in the values of physical and mechanical properties of ice rubble can be seen in the literature due to non-standardised methods. LÄS MER