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 48 for “"Computational mechanics"”.
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Stable Embedded Grid Techniques in Computational Mechanics
<p>Engineering mechanics problems involving interfaces, whether physical or introduced by numerical methodologies, are commonplace. Just a few examples include fracture and fault mechanics, classical contact-impact, phase boundary propagation, and fluid-structure interaction. This dissertation …
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Discrete Differential Geometry of Thin Materials for Computational Mechanics
… the physically behavior of the system with less computational effort. Thin objects, such as pieces of cloth, paper, sheet metal, freeform masonry, and steel-glass structures are particularly rich in geometric structure and so are well-suited for DDG. I show how understanding the geometry of time …
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A unified library of nonlinear solution schemes: An excursion into nonlinear computational mechanics
A library of nonlinear solution schemes including load, displacement, arc-length, work, generalized displacement, and orthogonal residual control are cast into a unified framework for solving nonlinear finite element systems. Each of these solution schemes differs in the use of a constraint …
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On the development of an efficient truly meshless discretization procedure in computational mechanics
… is to present an efficient and reliable meshless computational technique - the method of finite spheres - for the solution of boundary value problems on complex domains. This method is truly meshless in the sense that the approximation spaces are generated and the numerical integration is …
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A strategy for mapping unstructured mesh computational mechanics programs onto distributed memory parallel architectures
… that would enable unstructured mesh based computational mechanics codes to exploit the computational advantages offered by distributed memory parallel processors. Strategies that successfully map structured mesh codes onto parallel machines have been developed over the previous decade and …
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Computational analyses and optimization of thin-walled lattice structures and the application of physics-informed neural networks in computational mechanics
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01
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A study of localized failure modes in brittle materials
… and rock is a relatively unexplored area in computational mechanics, and this work applies current concepts to an isotropic damage model. The onset of localization is characterised by a bifurcation, where spatially uniform deformation is replaced by highly localized bands of large strain. …
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Automated Quadrilateral Coarsening by Ring Collapse
… adaptation has received extensive study in both computational mechanics and computer graphics to increase the resolution or accuracy of the solution in specific areas. The algorithm developed in this thesis, the Automated Quadrilateral Coarsening by Ring Collapse (AQCRC) algorithm, provides a …
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Extrinsic Cohesive Modeling of Dynamic Fracture and Microbranching Instability Using a Topological Data Structure
… has long been a challenge in the field of computational mechanics. The challenge consists of two aspects: a realistic representation of fracture criteria, and its efficient incorporation into a viable numerical scheme. This study investigates the dynamic failure process in a variety of …
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A computational implementation of design sensitivity analysis and structural optimisation
In the field of computational mechanics, increases in computing power and enhancements in material and kinematic models have enhanced the feasibility of performing structural design optimisation for a wide range of applications. The work presented here was motivated by the current groundswell of …
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Combining numerical simulation and machine learning - modeling coupled solid and fluid mechanics using mesh free methods
… engineering design process. In this thesis the computational mechanics technique, the Material Point Method (MPM) is extended to model the mixed-failure of damage propagation and plasticity in the aggregate materials commonly found deep underground. To achieve this, the Grady-Kipp damage model …
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Delamination initiation in postbuckled dropped-ply laminates
… elements. The analysis was performed using the COmputational MEchanics Testbed (COMET), an advanced structural analysis software environment developed at the NASA Langley Research Center to provide a framework for research in structural analysis methods. Uniaxial compression testing of …
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Computational multiscale analysis and optimization of multiphase hierarchical structures within a continuum micromechanics framework
… agricultural crops. This thesis aims to develop computationally feasible and accurate multiscale analysis and optimization methods that rationally predict the mechanical behavior and self-adapting mechanisms of multiphase hierarchical systems across multiple scales. We focus on three objectives …
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Improving programmability and performance for scientific applications
… first discusses optimizations performed on a computational mechanics solver using a novel coupling technique for multi-time scale methods for discrete finite element domains. We exploit domain semantics using a high-level dynamic runtime scheme to reorder and balance workloads to greatly …
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A comparative numerical study on the failure evolution at different simulation scales
… OF MISSOURI-COLUMBIA AT AUTHOR'S REQUEST.] In computational mechanics, different numerical approaches and simulation scales may lead to different results. It is because each approach has its own solution scheme feature, such as the governing equation, forcing function, and integration …
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Optimisation modelling for microelectronics packaging and product design
… of electronic packaging. This framework couples computational mechanics and fluid dynamics, based on finite volume method with integrated finite element routines, with numerical optimisation and statistical methods. This integrated approach is intended as a modelling tool for calculating optimal …
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Modeling of sheet metal fracture for shell finite elements with component level validation
… makes related advances in experimental and computational mechanics a pressing issue. The industry has been using shell finite elements in design practice due to many practical advantages over solid elements. A constitutive assumption of the plane stress condition in shell elements, violated …
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Extension of the peridynamic theory of solids for the simulation of materials under extreme loadings
… one of the key challenges in the field of computational mechanics. Despite significant advances, a fully robust and generally applicable computational framework for simulating the response of materials under a wide range of dynamic loading conditions is still lacking and the search for …
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Two-dimensional to three-dimensional global/local finite element analysis of laminated composites in compression
… of the global/local procedure in reducing the computational effort required to solve these problems is clearly demonstrated through examination of the computer time required to formulate and solve the linear, static system of equations which result for the global and local analyses to those …
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