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 20 for “"Circular Holes"”.
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The compressive failure of graphite/epoxy plates with circular holes
… measuring 12.70 cm by 25.40 cm and containing circular cutouts ranging to 3.81 cm are reported. Two thicknesses, 24 ply and 48 ply were chosen to differentiate between stability failures due to buckling and strength failures due to the presence of the cutout. The critical load of the 24 ply …
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The buckling and post-buckling behaviour of simply supported rectangular plates with centrally located circular holes
… and rectangular plates with centrally located circular holes. The review of the current literature is preceded by a brief description of the approximate methods of plate buckling and post-buckling analysis. The basic equations of compatibility, equilibrium and strain energy are described. …
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The effect of thickness on the fracture behavior of graphite/bismaleimede laminates with central circular holes
… around the hole. Damage development around the holes was studied using x-ray radiography. In general, the small holes created more damage than the large holes and the thin laminates were more susceptible to damage than the thick laminates. All notched specimens exhibited matrix cracking in the …
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Plug repairs of marine glass fiber / vinyl ester laminates subjected to uniaxial tension
… ester chopped strand mat plugs to fill circular holes. The stress distributions around circular holes in various glass fiber/vinyl ester woven roving laminates subjected to uniaxial tension are calculated before and after repairs using plug materials of different fiber volume fractions. …
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Plug repairs of marine glass fiber / vinyl ester laminates subjected to in-plane shear stress or in-plane bending moment
… step repairs. The stress concentrations around circular holes in glass fiber / vinyl ester woven roving laminates subjected to in-plane shear and bending were calculated before and after repairs using CSM plugs, also of glass fiber / vinyl ester, having varying fiber volume fractions. The …
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Vertical -Cavity Surface -Emitting Lasers Operating in Photonic Crystal Waveguide Defect Modes
… study of the use of a periodic array of etched circular holes in the top distributed Bragg reflector of a vertical cavity surface-emitting laser to achieve single mode operation with a simple fabrication process is carried out. A theoretical analysis of photonic crystals is conducted to design …
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Analysis of fiber-reinforced composite plates utilizing curvilinear fiber trajectories
Four plates with centrally located circular holes were manufactured using a fiber placement technique. With two plates the fibers were steered around the holes in curvilinear trajectories. With the two other plates the fibers were placed in the conventional straight line format. For the case of the …
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Compressive failure of notched angle-ply composite laminates: three-dimensional finite element analysis and experiment
… and [(±45)₁₂]<sub>s</sub> with central circular holes were tested under uniaxial compressive loading. The results from these tests show that the [(±45)₁₂]<sub>s</sub> laminate exhibited plastic deformation, with ultimate applied strains exceeding -1%. All other laminates failed in a …
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Global-local finite element analysis of laminated composites
… in laminated composite plates with a central circular hole. Detailed solutions were sought for the interlaminar normal stress distributions close to the free straight edge of the plate as well as around the edge of the hole. The Global model was analyzed as a two-dimensional problem. The …
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Stress analysis of simply and multiply connected regions containing cracks by the method of boundary collocation
… of cracks emanating from, or in the vicinity of holes or boundaries of various shapes in two-dimensional. elastic bodies. The solution is based on the complex variable method developed by Muskhelishvili and a numerical technique known as collocation for approximating the stress or displacement …
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An Investigation of the Multiple Scattering of Waves in Two-Dimensional Random Media
… medium was demonstrated for a thin plate with circular holes.
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Topics in structural topology optimization
… of topology optimization as means to nucleate holes within a structure. Here we use the topological derivative to approximate the energy release rate field corresponding to a small crack at any boundary location and at any orientation. Our proposed method offers significant computational …
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Web crippling behaviour of cold-formed steel sections with circular web openings under one-flange loading
… (FEA) are used to investigate the effect of circular web openings on web crippling behaviour of cold-formed steel channel-sections with circular web openings under interior-one-flange (IOF) and end-one-flange (EOF) loading condition; the cases of both flanges unfastened and flanges fastened …
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Finite element modelling of photonic crystal fibres
… (PCF), a new kind of optical fibre, has many air-holes in their cross-section and has potential applications to new optical communication systems. The main objective of this research is the modelling of photonic crystal fibre to identify the fundamental and higher order quasi-TE and TM modes with …
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Computational Investigation of Tunable Steel Plate Shear Walls for Improved Seismic Resistance
… were conducted and two configurations namely circular holes and butterfly shaped links around the perimeter, that showed promising results were chosen. The solid plate in the middle of the panel contributes significant pre-yield stiffness to the system while the geometry of the perimeter …
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Dynamics of Cellular Rigidity Sensing on the Micron and Sub-micron Scale
… creation of a rigid mold consisting of arrays of circular holes into which a thin layer of Au is deposited, while the top surface of the mold and the sidewalls of the holes are protected by a sacrificial layer of Cr. When an elastomer is formed in the mold, Au adheres to the tops of the molded …
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Optimization of Point-of-Use Water Treatment Device for Disaster Relief
… 12.7 cm-wide internal mixing baffle with two cut circular holes for the promotion of turbulence during mixing. The desired post-treatment chlorine residual was achieved for different durations depending on initial organic carbon concentration. Optimal PŪR<sup>®</sup> dose to provide pathogen …
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Optomechanics of two- and three-dimensional soft photonic crystals
… structural pattern transformation from simple circular holes to alternately oriented ellipses in a square lattice due to uniaxial compression. The incident light does not have any effect on the properties of the elastomer material. A decomposition of the deformation gradient quickly shows that …
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Domain patterns and domain wall dynamics in small-scale ferroelectrics
… lamella designs, based on simple triangular and circular hole features, with consideration as to how these factors would affect field amplitude distribution under an externally applied field. In real KTiP04 lamellae, with FIBed circular holes, domain walls imaged using PFM were repeatedly …