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 18 of 18 for “"material modelling"”.
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Multi-physics Diffuse Interface Methods For Computational Material Modelling
… a novel numerical method for computational material modelling that is capable of incorporating a broad range of different materials and physical processes. Specifically, this work uses an Eulerian finite-volume diffuse interface scheme to examine high-Mach-number flows in a range of …
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Implicit coupled constitutive relations and an energy-based method for material modelling
The contributions of this thesis are an implicit modelling method for the coupled constitutive relations and an energy-based method for material modelling. The two developed methods utilise implicit models to represent material constitutive relations without the requirement of physical parameters. …
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Validation of hygrothermal material modelling under consideration of the hysteresis of moisture storage
… is significantly dependent on the applied material functions. These functions are determined by the material modelling marking the connection between the basic storage and transport parameters which are obtained from basic measurements, and the storage and transport coefficients which are …
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All Mach Number Schemes for Highly Magnetised MHD flows and Multi-material Modelling
… magnetohydrodynamic (MHD) flows and (ii) multi-material flows. First, we present a new conservative semi-implicit scheme for the ideal and visco-resistive MHD system, designed to address the multiscale nature of the equations and able to efficiently handle different acoustic and Alfvén Mach …
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Micromechanics-Based Analysis of Fiber-Reinforced Laminated Composites
A procedure for three-dimensional nonlinear material modelling of fiber-reinforced laminated composites is presented. The material modelling procedure has a two-level hierarchical structure. At the bottom level, constitutive information about the fiber and the matrix phases are synthesized using a …
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Using MELCOR with enhanced predictive capabilities via Thermochimica to model two severe accident cases of a generic BWR with Zry-2 and FeCrAl
… goal of this work was to enhance MELCOR’s material modelling capabilities via one-way coupling of Thermochimica. MELCOR is a state-of-the-art code used to simulate the severe accident progression of a nuclear power plant. The first objective was developing the capabilities in Thermochimica …
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Investigation of nonlinear crack tip deformation including the effects of unsymmetric spatial variations of material properties
An extensive investigation of non-uniform material effects on static fracture analyses is undertaken. Included in the study are theoretical, experimental and numerical techniques of focusing attention on the nonsymmetric deformation fields around a crack tip in a non-uniform yield strength varying …
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Integrating Structural Fire Analysis with Hybrid Fire Testing: A Framework for Enhanced Stability, Software development and Full-Scale Evaluation.
… constrained by uncertainties in high-temperature material behaviour and difficulty representing realistic restraint. As a result, system-level fire response is still poorly understood. This thesis addresses these limitations through four integrated research contributions spanning Hybrid Fire …
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Statistical modelling of the transition toughness properties of low alloy pressure vessel steels
… and irradiation damage response of the material. Modelling of the inherent scatter of toughness measurements has received much academic interest since the mid-twentieth century and is found to be dependent on a number of metallurgical factors and failure modes; therefore, the …
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ANALYSIS OF BRAZILIAN SPLIT CYLINDER USING THE STATE BASED PERIDYNAMIC LATTICE MODEL
… years, does not handle such discontinuities. A material, as defined by continuum mechanics is that which is continuous and fills the space it occupies. Although this is a reasonable assumption for metals, it is an unrealistic notion for concrete. Stewart Silling invented peridynamics, which …
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Crashworthiness Multi-Material Topology Optimization for Minimum Mass
… (TO) and emerging techniques like multi-material topology optimization (MMTO) are effective for designing lightweight structures subjected to linear loading, but they cannot consider dynamic crash loading. Crashworthiness is most effectively simulated using dynamic finite element analysis …
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Calibration of empirical, semi-empirical, and physics-based material models for the prediction of creep and tensile behaviour of Alloy 617
Material models are powerful analytical tools for predicting material behaviour under various loading conditions. These models vary in complexity, progressing from empirical models that rely solely on fitting experimental data, to semi-empirical models that incorporate simplified physical concepts, …
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Multiscale modelling of woven and knitted fabric membranes
… years due to their tailorable structural and material performances. These tailorable properties include stretch forming and deep drawing formability that exhibits excellent stretchability and drapeability properties of textiles and textile composites. Since the inception of computerised …
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A Modelling Framework for Lightning-Induced Common-Mode Currents in Photovoltaic Modules and Small Arrays
… and validate computational electromagnetic (CEM) modelling techniques to replicate cell-to-frame coupling in PV installations and to evaluate the magnitude and significance of lightning-induced common-mode (CM) currents. A range of PV modules, spanning small-scale to full-size units and a complete …
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A numerical and experimental study of initial defibration of wood
… gaining more thorough knowledge both of suitable material modelling approaches for this type of simulation and of the mechanics of the initial defibration. Both experimental and numerical work is presented. The chip shearing tests serve to illustrate the complex behaviour of wood when loaded …
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Computational multiscale analysis and optimization of multiphase hierarchical structures within a continuum micromechanics framework
… microstructures at a smaller scale form the base materials for new microstructures at the next larger scale. Their complex multiphase hierarchical organization in conjunction with physiological, reproductive, and phylogenetic constraints pose significant challenges for understanding their …
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Experimental Studies of Reinforcing Steel and Shape Memory Alloys in Mechanically Spliced Connections for Seismic Application
… multi-splice connection, evaluating both the CAM material as well as the effect of the spliced connection. Another goal of the study was to evaluate the preliminary acceptance criteria for steel bars by testing 30 specimens spliced using three plausible couplers and provide recommendations for how …
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Carrier mobility of downscaled amorphous semiconductors exemplified by hydrogenated amorphous silicon
… of amorphous semiconductors have only targeted material- and device-level optimisations which often show low efficacy, low reproducibility, and/or lead to compromises in other metrics. In this thesis, considering the presence of short- and medium-range order in amorphous semiconductors which is …