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 21 for “"Isogeometric"”.
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Isogeometric Approach to Optical Tomography
… This research implements the recently developed Isogeometric Approach (IGA) and particularly IGA-based FEM to address the aforementioned issues. The IGA-based FEM has the potential to enhance adaptivity and reduce the computational cost of discretization schemes. The research in this study …
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Mixed Isogeometric Form Finding Of Lightweight Structures
… form finding has been implemented using isogeometric interpolation. Thus the isogeometric analysis has played a key role within the work because it allowed the interoperability between CAD and structural analysis avoiding the model conversion to a polygonal mesh and integrating the …
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Isogeometric topology optimization for auxetic metamaterials and structures
… about the developments of topology optimization, isogeometric topology optimization and the rational design of auxetic materials is provided. In Chapter 3, a more effective and efficient topology optimization method using isogeometric analysis is proposed for continuum structures using an enhanced …
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Modeling curvature-resisting material surfaces using isogeometric analysis
… at finite strains using surface-enriched isogeometric analysis. Coupled with a hyperelastic bulk, bending-resistance of material surfaces furnishes a new physical length scale, i.e., the elastobending length. We quantify the effect of elastobending deformations for several numerical …
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A sharp interface isogeometric strategy for moving boundary problems
<p>The proposed methodology is first utilized to model stationary and propagating cracks. The crack face is enriched with the Heaviside function which captures the displacement discontinuity. Meanwhile, the crack tips are enriched with asymptotic displacement functions to reproduce the tip …
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Isogeometric Design, Analysis and Optimisation of Lattice-Skin Structures
… and the lattice structure. A new and systematic isogeometric analysis approach that integrates the geometric design, structural analysis and optimisation of lattice-skin structures is proposed in the dissertation. In the geometric design of lattice-skin structures, a novel shape interrogation …
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Isogeometric Finite Element Code Development for Analysis of Composite Structures
This research endeavor develops Isogeometric approach for analysis of composite structures and take advantage of higher order continuity, smoothness and variation diminishing property of Nurbs basis for stress analysis of composite and sandwich beams and plates. This research also computes stress …
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Subdivision and manifold techniques for isogeometric design and analysis of surfaces
… automotive and aerospace. This thesis focuses on isogeometric design and analysis of surfaces, which aims to integrate engineering design and analysis by using the same representation for both. The unresolved challenge is to develop a desirable surface representation that simultaneously satisfies …
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Finite elements for higher-order problems in isogeometric analysis and statistical inference
… for higher-order problems with applications to isogeometric analysis and statistical inference. In both areas, the efficient solution of higher-order partial differential equations is essential. The construction of isogeometric smooth spline basis functions is crucial for solving higher-order …
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Isogeometric Analysis: Fundamentals and details of implementation. From first steps to two-dimensional non-linear problems
Isogeometric analysis (IGA) is a computational analysis technique that can serve as an alternative to the traditional finite element method (FEM) in approximating solutions to differential equations. IGA is not necessarily more efficient that traditional FEM, but because of its nature, can …
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Thermomechanical and Vibration Analysis of Stiffened Unitized Structures and Threaded Fasteners
… ANSYS while a fully functional code using isogeometric analysis was developed from scratch for the latter. For the threaded fasteners, a global simplified 3D model is built to evaluate the deformation of the structure. A second local model reproducing accurately the threads of the fasteners …
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Analysis, Design, and Experimentation of Beam-Like Structures
… in modeling low aspect ratio beams. First, an Isogeometric Analysis (IGA) is conducted using both FSDT and EBT to predict thermal buckling of periodically supported composite beams. Isogeometric analysis overcomes the limitations of the Gibbs phenomenon at discontinuities for a periodically …
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Space--Time Computation of a Ringsail Parachute With Model Thickness
… (ST-SI) method and recent advances in the ST-Isogeometric Analysis (ST-IGA), we can greatly reduce the number of elements. The ST-SI method, at an interface between two mesh zones, removes the matching requirement between the meshes on the two sides of the interface without losing solution …
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Flow Analysis of Vibration Modes in Turbocharger Turbines
… of the ST Slip Interface (ST-SI) method and ST Isogeometric Analysis (ST-IGA). The ST-SI enables the use of ST-VMS as a moving-mesh method even with the inner mesh rotating with the rotor. The ST-IGA with IGA basis functions in space brings superior accuracy to the geometry representation and …
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Simulating Earthquake-triggered Runout using Higher-order Hydromechanical MPM and PM4Sand
… To achieve this goal, a higher-order multiphase isogeometric MPM framework is proposed. Non-zero kinematic and periodic boundary conditions are developed to simulate shaking table loading and free-field modes. Finally, the PM4Sand constitutive model is implemented in the hydromechanical MPM to …
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Mollified piecewise polynomial approximants of arbitrary order and smoothness
… developed to bypass the meshing, for instance isogeometric analysis, immersed and particle methods. They, however, present challenges to the simulation of complex solid industrial-scale geometries. Our work is motivated by two general ideas. The first idea is based on the realisation that …
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Multiscale modelling of woven and knitted fabric membranes
… (RVEs) are modelled using nite deformable isogeometric spatial rods and deformation is homogenised using periodic boundary conditions. This nite deformable rod is profi cient in handling large deformations, rod-to-rod contacts, arbitrary cross-section de finitions and follower loads. …
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A variational framework for multi-scale defect modeling in strained electronics and processing of composite materials
… kinetic curing. Finally, a previously developed isogeometric FEM method is expanded to model quantum defect evolution of strained electronics and the effect of straining on the electronic properties of these materials. Representative numerical tests involving complex multi-phase flows of physical …
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Algebraic level sets for CAD/CAE integration and moving boundary problems
… risk. Numerical techniques based on enriched isogeometric approximations are adopted to model damage in the ULK stacks using a cohesive damage description. A damage analysis procedure is proposed to conduct damage accumulation studies during Cu wirebonding process. Analysis is carried out to …
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