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 170 for “"Rate-Dependent"”.
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Rate-Dependent Behavior of Clay
<p>This thesis presents a strain-rate dependent two-surface plasticity constitutive model for clays based on the critical-state soil mechanics. The model reproduces the mechanical response of clays under multi-axial loading conditions and predicts both drained and undrained behaviors at small and …
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Rate dependent rupture of solid-supported phospholipid bilayers.
… bilayers was performed in order to investigate rate-dependent behavior of force and probability of bilayer rupture. 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) solid-supported lipid bilayers were created on mica using vesicle fusion technique and then ruptured normal to the surface …
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Time intergration schemes for rate dependent elasto-plastic constitutive equations
… update procedures within the context of a rate dependent plastic material obeying the Von Mises yield condition. Material update procedures which have been used and analysed frequently are the Generalised Midpoint Algorithm, including the Midpoint Method, the Trapezoidal Rule and the …
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Strain-rate Dependent Fracture Load Prediction of Lead-free Solder Joints
The critical strain energy release rate at crack initiation, Jci, has been shown to govern the fracture of short solder joints. The present work measured Jci for 2 mm long SAC305 solder joints as a function of the strain rate and phase angle using DCB specimens. A drop tester was designed and built …
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A new elasto-viscoplastic model for rate-dependent behavior of clays
… with constructed fills on marine clays, or rate-dependent cyclic response of offshore foundations under wave loading. Although there are many observations on rate-dependent characteristics of clays in laboratory tests, none of the existing soil models has attained consistent descriptions of …
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On the rate-dependent constitutive response of cortical and trabecular bone
… these two materials over a wide range of strain rates is identified through both a review of the existing literature data and our own experimental investigations. For the behavior of compact bone two separate viscoelastic rate-sensitivity regimes are identified and modeled with a Maxwell-Weichert …
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Rate-dependent deformation behavior of poss-filled and plasticized poly(vinyl chloride)
Polymers are known to exhibit strong time-dependent mechanical behavior. In different temperatures or frequency regimes, the rate sensitivities of polymers change as various primary and secondary molecular mobility mechanisms are accessed. The incorporation of nanoparticles can potentially alter …
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The strain rate dependent mechanical properties and modelling of bovine cortical bone in compression
… bar experiments resulted in a specimen strain rate that decreases beyond reaching a maximum value at the rise time. The variation in dynamic strain rate was rectified by shaping the Hopkinson bar input pulse with a reusable, conical striker bar. The hypothesis investigated was that a varying …
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The characterization of c-rate dependent hard carbon anode fracture induced by lithium intercalation
… fracture characteristics under different cycling rates due to its lithium solid solubility and isotropic nature. In addition to the evaluation, an electrochemical shock map was modified from a previous study to try and predict what conditions of particle size and C-rate are necessary to cause …
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Viscoplasticity and damage mechanics models for rate-dependent materials and their application to ice
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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Development of rate-dependent thermoplastic constitutive models for numerical analysis of ceramics at high-temperature
… implemented into a numerical code, calibrated on experimental data, and validated. - The first model is elastic-plastic and addresses the cold compaction of ceramic powders, combining nonlinear elasticity, elasto-plastic coupling and increase of cohesion. - The second model is …
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Implementation and evaluation of a recently developed rate-dependent effective stress soil model 'MIT-SR'
Reliable modeling of rate-dependency in soil properties remains a major challenge for accurate solutions of many geotechnical problems. Although there are many sources of experimental data concerning rate dependent properties of clays, most pre-existing soil models have been found to have severe …
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Development and preliminary numerical investigations of a dislocation density-based finite-strain rate-dependent elastoplasticity constitutive model
… of a dislocation density-based finite-strain rate-dependent elastoplasticity constitutive model Finite-strain elastoplasticity constitutive models suitable for process-scale simulation are typically developed from empirical observations of phenomena of interest. Such models make use of …
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Application of rate dependent soil model, MIT-SR, for evaluation of long-term ground movements due to consolidation and creep
Saturated clays exhibit rate-dependent behavior (i.e. their stress-strain-strength properties are significantly affected by the applied loading rate). This is of great significance for geotechnical projects, particularly when long-term predictions of settlements of compressible soil strata are …
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Temperature and rate dependent finite strain behavior of poly(ethylene terephthalate) and poly(ethylene terephthalate)-glycol above the glass transition temperature
… depend strongly on temperature, strain rate, strain magnitude, and strain state. A robust constitutive model to accurately account for this stress-strain behavior in the processing regime is highly desirable in order to predict and computationally design warm deformation processes to …
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Viscoelasticity of Articular Cartilage and Ligament: Constitutive Modeling and Experiments
… capture both the short-term and long-term time-dependent response of these tissues with less difficulty in material characterization process. Due to the lack of the desired tensile experimental results on articular cartilage, the mechanical behavior of this tissue was also examined …
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A variational multiscale framework for non-Newtonian fluid models
… One class of non-Newtonian fluids is shear-rate dependent fluids that include nonlinear viscosity functions of the second invariant of the rate-of-deformation tensor, thereby resulting in shear-thinning or shear-thickening effects. Another is viscoelastic fluid models that embody elastic …
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Some aspects of stability in thermoelasticity
… three theories of thermoelasticity: temperature-rate-dependent thermoelasticity TRDTE which was formulated by Green and Lindsay [21]; temperature-rate-dependent thermoelasticity with generalized thermoelasticity, which we label TRDTE + GTE (1), formulated by Chandrasekharaiah and Keshavan [23]; …
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Default-free bond futures and options on default-free bond futures: Theoretical and empirical investigation
… In their model, the state space of interest-rate-dependent claims is spanned by the instantaneous spot interest rate and the long-term consol rate. This design is chosen to incorporate the features of interest-rate-dependent claims and to avoid inconsistencies in other pricing models for …
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