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Showing 1 to 20 of 157 for “"constitutive models"”.
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Modelling of welding with various constitutive models for steel
… is an attempt at the quality analysis of constitutive modelling of welding as a coupled thermo-mechanical or thermo-mechanical-metallurgical problem. Three types of inelastic theories of continua: unified viscoplasticity based on dislocation density theory, unified viscoplasticity based on …
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Numerical Constitutive Models of Woven and Braided Textile Structural Composites
… elastic moduli are determined from unit cell models of balanced plain weave, 2D braid, 2D triaxial braid and 4x4 twill textile composite materials consisting of interlaced or intertwined yarns. The yarn paths are modeled with undulation portions, in which one yarn passes over and under one or …
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Development of constitutive models for thin thermoelastic interphase in composite materials
… boundary between the two materials. Numerical models are then formulated across this interface to replicate the discontinuities (jumps) in thermo-mechanical fields, thereby substantially reducing the computational cost associated with direct modeling of the thin interphase domain. This research …
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Low dimensional intrinsic material functions uniquely identify rheological constitutive models and infer material microstructure
Made available in DSpace on 2013-02-03T19:18:23Z (GMT). No. of bitstreams: 2 Narayanan Ashwin Kumar_Bharadwaj.pdf: 5317555 bytes, checksum: 8997d27d51481208eef06a2a2f9726e6 (MD5) license.txt: 4082 bytes, checksum: 4d805d5496639ba3959b750fb2fc8438 (MD5)
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Microstructure-based Constitutive Models for Residual Mechanical Behavior of Aluminum Alloys after Fire Exposure
… characterization was utilized to develop constitutive models for the residual elasto-plastic mechanical behavior of the alloys. The constitutive models were developed as a series of sub-models to predict (i) microstructural evolution, (ii) residual yield strength, and (iii) strain …
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Development of rate-dependent thermoplastic constitutive models for numerical analysis of ceramics at high-temperature
Three constitutive models for the mechanical description of the behavior of ceramic materials are developed, 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 …
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Microstructurally-based constitutive models of cytoskeletal networks for simulation of the biomechanical response of biological cells
… space of the cytoskeletal filaments. The 3D constitutive network model provides a framework for capturing time-dependent spatial diffusion of cytosol within a porous, visco hyperelastic filament network. The poroelastic behavior is coupled with the hyperelastic network behavior through a 3D …
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Novel Rheometric Techniques and Constitutive Models for Linear and Nonlinear Rheology: Applications to Polymeric Solutions and Colloidal Gels
… the flow behavior, and modeling the constitutive response of these complex fluids is important for predicting time-varying material performance under various processing conditions, thus helping prevent failures in large-scale industrial operations. However, modeling the rheological …
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Analytical behaviour of FRP strengthened reinforced concrete beams under low velocity impact load incorporating rate dependant material constitutive models
… many of the Finite Element (FE) analysis models developed in these studies yielded results that were inconsistent with the test data. Key shortcomings of these models relate to a lack of definition of the FRP-concrete bond interface and considering rate dependent material behaviour.
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Evaluating the capabilities of some constitutive models in reproducing the experimental behaviour of stiff clay subjected to tunnelling stress paths
… This thesis evaluates the capabilities of four constitutive models in reproducing the intrinsic experimental behaviour of stiff clay when subjected to tunnelling-induced stress paths. Relevant stress paths have been determined from 2D and 3D finite element analysis using PLAXIS. Reconstituted …
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Simulation of blood flows in a stenosed and bifurcating artery using finite volume methods and OpenFOAM
… fluid which can be modelled via viscoelastic constitutive models. The most commonly used constitutive models for viscoelastic fluids include the OldroydB, Giesekus, Johnson-Segalman, Finitely Extensible Non-Linear Elastic (FENE), Phan-Thein-Tanner (PTT) models etc. Our Numerical approach is …
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Controllability of Non-Newtonian fluids under homogeneous flows
… the controllability of three popular constitutive models under homogeneous extensional and shear flows via the Lie bracket method. The constitutive models are as follows: the Phan-Thien-Tanner model; the Johnson-Segalman model; and the Doi model. The effect of extensional flow on these …
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Adaptation of granular solid hydrodynamics for modeling sand behavior
The development of constitutive models that can realistically represent the effective stress-strain-strength of the soil properties is essential for making accurate predictions using finite element analysis. Currently, most of the existing constitutive models are based on the framework of …
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Evaluation of Elastic-Plastic and Damage Models for Ultra High Performance Concrete (UHPC)
… research has previously been performed on constitutive modeling of NSC, constitutive modeling of HPC and UHPC is very limited and more research needs to be pursued in this area. Robust constitutive modeling will allow for accurate and reliable modeling and simulation of UHPC structures …
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Image-Based Geotechnical Constitutive Model Parameter Calibration
… through appropriately simplified mathematical models, commonly known as constitutive models. Conventional "element" tests (e.g. triaxial, simple shear) typically assume a homogeneous deformation response in a sample subject to externally applied stresses. While necessary due to current …
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Discrete element simulations and constitutive modeling of dense granular flows
… from quasi-static to intermediate behavior. A constitutive model based on the order parameter (OP) framework is refined, and a linear model with new model coefficients extracted from data of 3D DEM simulations of homogeneously sheared granular flows is proposed. The performance of different …
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Thermoelastoplastic and creep analysis of thick-walled cylinders / Abbas Loghman.
… with improved material elastoplastic and creep constitutive models. The results are validated experimentally and numerically.
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MODELING OF THERMO-MECHANICAL BEHAVIOR OF NITINOL ACTUATOR FOR SMART NEEDLE APPLICATION
… behaviors. Various existing SMA constitutive models were investigated and compared. Since SMA is used as an actuator in this project, only one dimensional constitutive models are considered. Two distinct models with different phase transformation kinetic approaches were chosen. …
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