Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 60 for “"elastoplastic"”.
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Elastoplastic buckling of doubly curved unstiffened shells
"The calculation of reliable values for the buckling pressure of thin shells has become very Important in recent years. The increased necessity and usage of lighter weight components in missile propulsion systems has required more precise calculations to avoid stability problems and to increase …
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Coupled elastoplastic springs for soil-structure interaction
Includes bibliographical references (pages 40-42).
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Wave tailoring in elastic and elastoplastic granular systems
This dissertation studies wave propagation in granular media with the objective of developing stress wave tailoring applications. Two mechanisms for wave tailoring are investigated: the first part focuses on energy dissipation in elasto-plastic granules and the second studies tunable wave …
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Holonomic Elastoplastic Truss Design Using Displacement Based Optimization
… problems with holonomic (path-independent) elastoplastic laws were investigated. This type of material nonlinearity allows us to naturally extend the linear elastic truss sizing in the DBO setting to nonlinear problems. A computer program that uses the commercially available optimizer DOT by …
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Dynamic Response of Elastoplastic Two-Degree-of-Freedom Systems to Groundshock
Made available in DSpace on 2014-12-05T17:37:40Z (GMT). No. of bitstreams: 1 6305066.pdf: 7651275 bytes, checksum: 4655e16a544896158e4a49f306bf1467 (MD5) Previous issue date: 1963
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Elastoplastic response of unidirectional graphite/aluminum under combined tension-compression cyclic loading
… using 606l-O aluminum specimens. The elastoplastic response of graphite/aluminum l5° off-axis and 90° specimens under tension-compression cyclic loading was subsequently investigated at three temperatures, -l50°F, room temperature and 250°F. The test results showed that the tensile …
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Elastoplastic nonlinear analysis of nozzle-cylinder intersections subjected to internal and external loads
A three-dimensional finite element analysis utilizing quadratic isoparametric elements is applied to the cylindrical connection. The finite element mesh is highly refined in the three principal directions in the critical regions of sharp discontinuity of geometry and material. Convergence of the …
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Micromechanical finite element model for constitutive elastoplastic analysis of unidirectional fiber-reinforced composites
… array of elastic circular fibers embedded in an elastoplastic matrix subjected to a plane stress loading. This model enforces symmetry and anti-symmetry conditions isolating the smallest unit cell and should greatly increase the speed of doing "built-inn micromechanics within a larger finite …
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Análise da torção elastoplástica de sólidos de revolução pelo método dos elementos de contorno
… Element Method for the analysis of elastic and elastoplastic torsion of solids of revolution. The problem under consideration is tri-dimensional; however, due to its axisymetric nature, it may be treated as a bi-dimensional one, with the analysis being made in the r-z plane of the cylindrical …
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Συμβολή στην ανάλυση των εκσκαφών με την μέθοδο των πεπερασμένων στοιχείων
… MULTI-STAGE EXCAVATION FOR SOILS OBEYING AN ELASTOPLASTIC LAW AND TO VERIFY IF THEFINAL SOLUTION IS INDEPENDENT OR NOT WHATEVER THE NUMBER OF EXCAVATION STAGES USED IN THE SIMULATION PROCESS. THE NON-LINEAR FINITE ELEMENT EQUATIONS ARE DERIVED FROM A VARIATIONAL FORMULATION WHICH ACCOUNTS FOR …
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Multi-physics Diffuse Interface Methods For Computational Material Modelling
… flows in a range of materials, including fluids, elastoplastic solids and multi-phase mixtures. This is achieved by both amalgamating existing separate diffuse interface methods for multi-phase reactive fluids and solid dynamics, as well as extending the model with a set of novel methods to allow …
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Thermoelastoplastic and creep analysis of thick-walled cylinders / Abbas Loghman.
In this thesis, time-independent thermoelastoplastic and time-dependent creep stress and damage analysis of thick-walled cylinders are investigated using incremental theory of plasticity in conjunction with improved material elastoplastic and creep constitutive models. The results are validated …
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Work, power, and resetting statistics in stochastic models of physical systems under drive
… discussed. I then move on to constructing a new elastoplastic model called N-element Hébraud-Lequeux to analyse fluctuations in the local injected power in amorphous systems under constant shear. Unlike many popular elastoplastic models, this one permits stochasticity in its local stresses and …
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A study of the maximum transient response of simple fully yielding structures
… maximum response of the single degree of freedom elastoplastic system and the effect upon it of viscous damping and a transition region between the elastic and plastic states. The extension of the approach to the two degree of freedom elastoplastic system was also investigated. The study was …
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THEORETICAL DETERMINATION OF THE YIELD CURVE FOR UNSATURATED SOILS
… Barcelona Basic Model (BBM) was the first elastoplastic constitutive model for unsaturated soils. The yield curve, which separates the elastic region from the elastoplastic region, is an important aspect of constitutive modeling for unsaturated soils. Most concepts for unsaturated soils …
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Vector offset operators for deformable organic objects.
… Operator. Stress / strain graphs control the elastoplastic behaviour of the model. Strain creep, stress relaxation and hysteresis graphs control the viscoelastic behaviour of the model. External forces may be applied using motion paths equipped with momentum / time graphs. Finally, spatial and …
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Non-linear analysis of infilled frames.
… compression are developed. The non-linear elastoplastic behaviour of concrete is modelled using the concept of equivalent uniaxial strain and the model is extended for cracked materials. Elastoplastic models are also developed for ductile materials(steel) for secant and incremental changes …
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Micromechanics of deformation and stress evolution in thin films and patterned lines on substrates
… first part of this investigation dealt with the elastoplastic behavior of interconnect lines during thermal cycling. A robust computational method was developed to predict volume-averaged stresses in unpassivated and passivated lines in response to changes in temperature, as a function of line …
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Análise estrutural de painéis curvados reforçados sob carregamento de pressão externa uniforme
… results. The results from linear and elastoplastic numerical simulations are presented in the parametric analysis and in the case study. The parametric analysis verifies the influence of geometric parameters on the collapse, while the study case examines the critical pressure of full …
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