Sökning: "Softening"

Visar resultat 1 - 5 av 123 avhandlingar innehållade ordet Softening.

  1. 1. Method for determination of the softening behaviour of wood and the applicability of a nonlinear fracture mechanics model

    Detta är en avhandling från Division of Building Materials, LTH, Lund University

    Författare :Lars Boström; [1992]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fracture mechanics; wood; shear; fictitious crack model; tension; linear elastic fracture mechanics; softening; trä; materialegenskaper; hållfasthet; skjuvning; brottmekanik;

    Sammanfattning : The thesis deals with determination of the post peak behaviour of wood in pure tension and pure shear. Furhermore, the "Fictitious Crack Model" (FCM), which is a nonlinear fracture mechanics model ; originally developed for description of crack propagation in concrete, is employed to demonstrate the advantages of non linear fracture mechanics. LÄS MER

  2. 2. Fatigue Strength of Friction Stir Welded Joints in Aluminium

    Detta är en avhandling från Stockholm : KTH

    Författare :Mats Ericsson; KTH.; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Applied Materials Technology; friction stir welding; fatigue; mechanical properties; welding speed; softening; Materialvetenskap; TECHNOLOGY Materials science; TEKNIKVETENSKAP Teknisk materialvetenskap;

    Sammanfattning : Solid state Friction stir welding (FSW) is of major interest in the welding of aluminium since it improves the joint properties. Many applications where Al-alloys are used are subject to varying load conditions, making fatigue failure a critical issue. LÄS MER

  3. 3. Behaviour of fracture process zones in concrete influenced by simultaneously applied normal and shear displacements

    Detta är en avhandling från Division of Building Materials, LTH, Lund University

    Författare :Manouchehr Hassanzadeh; [1992]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; softening; mixed mode; fictitious crack model; concrete; deformationer; betong; brottmekanik; hållfasthet; brotthållfasthet; spänningar; skjuvspänningar; sprickor; beräkningsmodeller; brottenergi; teori; laboratorieförsök; interlock; crack path; diagonal crack; microcracking; instability; fracture energy; fracture mechanics; shear; tension; process zone;

    Sammanfattning : The thesis deals with the determination of the post peak behaviour of concrete in pure tension, and combined tension (compression) and shear. A test arrangement has been developed in order to determine the post peak behaviour of concrete expressed as stress - displacement curves. LÄS MER

  4. 4. Cracking in Reinforced Concrete Structures Due to Imposed Deformations

    Detta är en avhandling från Structural Engineering, Lund University

    Författare :Agnes Nagy; [1997]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; minimum reinforcement; cracking; softening; shrinkage; cooling; imposed deformations; conversion formula; static E-modulus; damping coefficient; resonance frequency; dynamic E-modulus; constitutive model; thermal stress; hydration process; reinforced concrete structure; early age; crack control; Building construction; Byggnadsteknik;

    Sammanfattning : This thesis is concerned with modeling of the cracking process in reinforced concrete due to imposed deformations. Cracking is investigated both at early ages, during hydration, and at mature age when the final properties of the concrete are reached. LÄS MER

  5. 5. Effects of surfactant adjuvants on plant leaf cuticle barrier properties

    Detta är en avhandling från Malmö University, Faculty of Health and Society

    Författare :Anton Fagerström; Malmö University.; Malmö University.; [2014]
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Sciences; Adjuvant; Surfacant; Cuticle; Tebuconazole; Diffusion; Clivia miniata Regel leaf; Model wax; Phase diagram; Hydration; Eutectic melting; Crystalline domains; Softening; Wax film; Quartz Crystal Microbalance with dissipation QCM-D ; Differential Scanning Calorimetry DSC ; Small- and Wide-angle X-ray Diffraction SWAXD ;

    Sammanfattning : The focus of this project has been the mechanisms of action of surfactants as agricultural adjuvants and the physico-chemical interactions between adjuvant, carrier formulation, and leaf surface. To increase the understanding of this complex system, model systems have been evaluated in parallel to in vitro studies of plant leaf cuticle. LÄS MER