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Showing 1 to 20 of 37 for “"Plastic deformations"”.

  1. A coupled theory for diffusion of hydrogen and large elastic-plastic deformations of metals

    Di Leo, Claudio VMassachusetts Institute of Technology2012

    … hydrogen, diffusion of heat, and large elastic-plastic deformations of metals is developed. Our theoretical framework places the widely-used notion of an "equilibrium" between hydrogen residing in normal interstitial lattice sites and hydrogen trapped at microstructural defects, within a …

    mit Repository record

  2. Comparison of Theory and Experiment for Pressure-Tension Loading of Thin-Walled Cylinders Under Loading Conditions That Produced Isotropic and Anisotropic Plastic Deformations

    Johnson, Kenneth RaymondUniversity of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-12T00:25:46Z (GMT). No. of bitstreams: 1 7206968.pdf: 1586298 bytes, checksum: c0de808ca0500a228ef04e9a36fa8b2d (MD5) Previous issue date: 1971

    uiuc Repository record

  3. Cilindro espesso curvo submetido a carregamentos combinados no plano de momento fletor, força normal e força cisalhante

    Barbosa, Marcelo Luiz LigeiroUniversidade Federal do Rio de Janeiro2017

    … order to establish an acceptance criterion for plastic deformation. The behavior was evaluated by numerical analysis using the finite element method. In this study, loads that caused excessive plastic deformations as well as structural stability lost were identified and an acceptance criterion …

    brazil-uerj Repository record

  4. A nonlinear viscoplastic double yield surface constitutive model for geologic materials

    Madaschi, AldoUniversità degli studi di Trento2015

    … is based on the framework of overstress viscoplastic theory and can be applied to any elastoplastic (inviscid) model.The most innovative idea of the proposed model is the identification of two components of strain for each deformation mechanism. In particular, in both the elastic and the …

    trento Repository record

  5. Theoretical and numerical aspects of problems in finite-strain plasticity

    Eve, Robin AndrewDepartment of Mathematics and Applied Mathematics1992

    A new internal variable theory of plasticity is presented. This theory is developed within a framework of non-smooth convex analysis; a unification of ideas concerning the postulates of plasticity is achieved by using the powerful tools provided by results in this branch of mathematics. A firm …

    cape-town Repository record

  6. Chemo-mechanics of lithium-ion battery electrodes

    Di Leo, Claudio VMassachusetts Institute of Technology2015

    … species diffusion with large elastic deformations of a body. Through a split-method, we have numerically implemented our theory, and using our implementation we first studied the diffusion-only problem of spinodal decomposition in the absence of mechanical deformation. Second, we …

    mit Repository record

  7. Molecular dynamics simulations of metallic friction and of its dependence on electric currents: development and first results

    Meintanis, Evangelos AnastasiosThe University of Texas at Austin2009

    … and verify the importance of cold-welding and plastic deformations in dry sliding friction. Our first data also show a mechanism for decoupling between load and friction at high velocities. Such a mechanism can explain an increase in the coefficient of friction of metals with velocity. The …

    texas Repository record

  8. ΜΕΛΕΤΗ ΤΗΣ ΕΛΑΣΤΙΚΗΣ-ΑΠΟΛΥΤΩΣ ΠΛΑΣΤΙΚΗΣ ΕΝΤΑΤΙΚΗΣ ΚΑΙ ΠΑΡΑΜΟΡΦΩΣΙΑΚΗΣ ΚΑΤΑΣΤΑΣΕΩΣ ΡΗΓΜΑΤΩΜΕΝΩΝ ΠΛΑΚΩΝ ΣΕ ΣΥΝΘΗΚΕΣ ΕΠΙΠΕΔΟΥ ΕΝΤΑΣΕΩΣ

    Κυριαζή, ΕυαγγελίαNational Technical University of Athens (NTUA)1989

    … TECHNIQUE WAS APPLIED TO ESTIMATE ELASTIC AND PLASTIC DEFORMATIONS AS WELL AS TO DEFINE THE ELASTIC-PLASTIC BOUNDARIES IN SUCCESSIVE LOADING STEPS UNDER CONDITION OF PLANE STRESS. THE ANALYTICAL CALCULATION OF STRESS STATE BASED ON EXPERIMENTAL DATA WAS CARRIED OUT WITH THE AID OF THE THEORY OF …

    greece Repository record

  9. Peridynamics For The Solution Of Multiphysics Problems

    Oterkus, SeldaThe University of Arizona.2015

    … Solutions coupled field problems concerning plastic deformations, thermomechanics, hygrothermomechanics, hydraulic fracturing, thermal cracking of fuel pellet and electromigration are constructed. Their comparisons with the finite element predictions establish the validity of the PD field …

    arizona-thes Repository record

  10. Closure of fatigue cracks at high strains

    Iyyer, Nagaraja S.Virginia Polytechnic Institute and State University1985

    … cover from predominantly elastic to grossly plastic strains. Crack closure measurements were made at different crack lengths. The study reveals that, at high strains, cracks close only as the lowest stress level in the cycle is approached. The crack opening was observed to occur in the …

    vt Repository record

  11. Analysis of bow crushing in ship collision

    Kim, Ji Young, 1968-Massachusetts Institute of Technology2000

    … is developed by identifying localized zones of plastic deformations from photographs of damaged ships. Then, the contributions of the membrane and bending resistance is assessed and a simple computational model is developed. The solution includes determination of the force-indentation …

    mit Repository record

  12. Numerical simulation of fluid flow, proppant transport and fracture propagation in hydraulic fractures for unconventional reservoirs.

    Suri, YatinRobert Gordon University2020

    … propagation model to brittle rocks and neglect plastic deformations. Thus, in the present study, the fracture propagation was modelled using the extended finite element method (XFEM) and cohesive zone model (CZM), which can model the plastic deformations in the ductile rock. The fracture …

    rgu Repository record

  13. Infiltration of a Two-State Compressible Fluid Through a Linearly Deformed, Porous, Elastic, Fissured Rock

    Khaled, Mamdouh YoussefUniversity of Illinois at Urbana-Champaign2014

    … and hydraulic anisotropy, viscous flow, and plastic deformations are suggested.

    uiuc Repository record

  14. Resistência última de navios e plataformas danificados por colisões

    Amante, Diogo do Amaral MacedoUniversidade Federal do Rio de Janeiro2017

    … nonlinear process and, mainly, involves large plastic deformations. To assess the severity of the damage, there is a need to develop robust and reliable numerical models. Consequently, experimental tests were performed with reduced intact and damaged models of stiffened panels and box girders. …

    brazil-uerj Repository record

  15. An Analysis of Current Interruption upon the Behavior of Light Bulb Filament during Initial Aircraft Impact in Support of Aircraft Accident Investigations

    LaRow, Daniel J.

    … and the filament of a lit bulb will display plastic deformation (Ellis, 1984).</p> <p>The main purpose of this study was to investigate the effects of current disruption as a result of initial impact forces upon light bulb filament behavior. One hundred and twenty commercially available T-1 …

    embry-riddle Repository record

  16. A THREE-DIMENSIONAL FULLY COUPLED HYDRO-MECHANICAL ELASTO-PLASTIC MODEL FOR UNSATURATED SOILS WITH CONSIDERATION OF HYSTERESIS BEHAVIOR

    Riad, Beshoy Sami MoussaMissouri University of Science and Technology

    … the change in yield stress, soil stiffness, and plastic deformations due to chemical presence"--Abstract, p. iv</p>

    must-thes Repository record

  17. Online Estimation of Unknown Parameters for Flexible Spacecraft

    Woodward, Nicolo

    … complicating the controller design. Furthermore, plastic deformations due to long periods of storage of stowed flexible components could result in exciting frequencies outside of the designed controller’s bandwidth, leading to an uncontrollable system. This thesis proposes a method to develop a …

    embry-riddle Repository record

  18. Coupled deformation-diffusion-fracture theories for solids : application to polymeric gels and hydrogen embrittlement in steels

    Mao, YunweiMassachusetts Institute of Technology2018

    … of hydrogen coupled with the large elastic-plastic deformations, and a phase-field type theory to model ductile fracture of metals. The theory accounts for the macroscopic effects due to the generation and agglomeration of microscopic hydrogen-vacancy complexes. We have implemented our fully …

    mit Repository record

  19. Constitutive relationships for agricultural soils

    Brandon, Joseph RobertVirginia Polytechnic Institute and State University1987

    … curve were assumed to represent the elastic and plastic deformations of the sample, respectively. Assuming an associated flow rule, an elastic-plastic constitutive model was developed based on a Mohr-Coulomb failure surface. The constitutive model developed was evaluated by simulating a triaxial …

    vt Repository record

  20. The response of impulsively loaded sandwich plates

    Farrow, Gary HerbertDepartment of Mechanical Engineering1995

    … in the impulse range that results in large plastic deformations known as Mode I Failure. Mode II and III failure of the plates, where failure by tearing occurs, is omitted. The results of the single plate analysis are compared to experimental and analytical work. Criteria for comparison …

    cape-town Repository record

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