Sökning: "Finite strains"

Visar resultat 11 - 15 av 71 avhandlingar innehållade orden Finite strains.

  1. 11. Modelling of the Fletcher-Gent effect and obtaining hyperelastic parameters for filled elastomers

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Rickard Österlöf; KTH.; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; filled elastomers; natural rubber; carbon black; Fletcher-Gent effect; Payne-effect; finite strain; hyperelastic;

    Sammanfattning : The strain amplitude dependency , i.e. the Fletcher-Gent effect and Payne effect, and the strain rate dependency of rubber with reinforcing fillers is modelled using a modified boundary surface model and implemented uniaxially. LÄS MER

  2. 12. Control of Cracking due to Imposed Strains in Concrete Structures

    Detta är en avhandling från Division of Structural Engineering, Lund University, P.O Box 118, SE-221 00 Lund, Sweden

    Författare :Dan Pettersson; Lunds universitet.; Lund University.; [2000]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydraulic engineering; Civil engineering; Friction.; Restraint; Shrinkage; Imposed deformations; Minimum reinforcement; Crack widths; Reinforced concrete; Crack development; Crack control; offshore technology; soil mechanics; Väg- och vattenbyggnadsteknik;

    Sammanfattning : Popular Abstract in Swedish Sprickkontroll av betongkonstruktioner är ett viktigt men ofta styvmoderligt behandlat område. Detta gäller speciellt för konstruktioner utsatta för tvångsbelastning, t ex temperaturbelastning eller krympning av betongen i kombination av yttre tvång. LÄS MER

  3. 13. Beam-to-Beam Contact and Its Application to Micromechanical Simulation of Fiber Networks

    Detta är en avhandling från KTH Royal Institute of Technology

    Författare :Hamid Reza Motamedian; KTH.; [2018]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fiber network; beam-to-beam contact; rotational contact; non-consistent; simulation; finite element; multiscale; microscale; micromechanics; paper; refining; beating; fine; hygroexpansion; shrinkage; drying; Solid Mechanics; Hållfasthetslära;

    Sammanfattning : This doctoral thesis covers the topic of modeling the three-dimensional fiber net- works with the finite element method. It contains the part addressing the numerical aspects of the modeling, namely, the contact formulation and application of the developed methods to the fundamental questions such as the effect of randomness in fiber properties and effect of fines and hygroexpansion. LÄS MER

  4. 14. Modeling and experimental characterization of pearlitic rail steels subjected to large biaxial strains

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Knut Andreas Meyer; [2017]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hyperelasto-plasticity; axial-torsion; kinematic hardening; biaxial loading; Pearlitic steel;

    Sammanfattning : Large shear strains develop in the near-surface region under the running band of railway rails. Rolling Contact Fatigue (RCF) cracks often initiate in this region, causing major problems for the railway industry. However, characterization of the constitutive and fatigue behavior of this region is difficult due to the large gradient of properties. LÄS MER

  5. 15. Improving Stress Tolerance in Industrial Saccharomyces cerevisiae Strains for Ethanol Production from Lignocellulosic Biomass

    Detta är en avhandling från Department of Chemistry, Lund University

    Författare :Valeria Wallace; Lunds universitet.; Lund University.; [2014]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Saccharomyces cerevisiae; lignocellulose; ethanol; inhibitors; temperature; stress tolerance;

    Sammanfattning : Popular Abstract in English Oil resources are finite; and political and economic factors affecting oil production,together with the environmental damage associated with the increased use of oil by a rapidly growing population, have underscored the need for developing cleaner technologies based on sustainable resources. In this context, any lignocellulosic biomass that is not used in the food chain, such as woody crops and agricultural and forestry by-products, is an appealing raw material for the production of so-called “second-generation (2G) biofuels”, and more specifically 2G ethanol (as opposed to the “first-generation (1G) ethanol”, which is based on edible cellulosic biomass). LÄS MER