Index Catalog // ScholarsArchive@OSU

Micromechanics of heterogeneous materials under compressive loading

Creator:: Laird, George
Abstract:: In mining and mineral processing, compressive loading is often encountered during the comminution of ore bearing minerals and in the wear resistant materials used in the comminution circuit. A common thread joining many of the materials that are primarily used under compressive loading is the presence of a high modulus...
Resource Type:: Dissertation
Full Text:: through my Bachelor, Master, and Doctorate degrees. It has been a wonderful adventure, and Dr. Kennedy

A relationship between wave dispersion and fracture strength for a composite material

Creator:: Ilcewicz, Larry Bert
Abstract:: Wave dispersion and fracture are phenomena that involve. mechanisms triggered at the scale of a material's internal structure. Experiments were performed with a candidate material to judge the hypothesis that wave dispersion measurements can be used to nondestructively predict fracture strength. Wood-based particleboard was chosen as the candidate material because...
Resource Type:: Dissertation
Full Text:: . Title: A Relationship Between Wave Dispersion and Fracture Strength for a Composite Material Abstract

Three-dimensional, nonlinear viscoelastic analysis of laminated composites : a finite element approach

Creator:: Wang, Min
Abstract:: Polymeric composites exhibit time-dependent behavior, which raises a concern about their long term durability and leads to a viscoelastic study of these materials. Linear viscoelastic analysis has been found to be inadequate because many polymers exhibit nonlinear viscoelastic behavior. Classical laminate theory is commonly used in the study of laminated...
Resource Type:: Dissertation
Full Text:: : Timothy C. Kennedy Polymeric composites exhibit time-dependent behavior, which raises a concern about

Simulating changing diameter distributions in a softwood sawmill

Creator:: Salichon, Maxence C.
Abstract:: Sawmills are very complex systems that involve many manufacturing processes. The variability of their raw material adds further to this complexity as each log has characteristics that determine its processing path. Therefore, computer simulation is a very useful technique for analyzing sawmill performance. This thesis describes a simulation computer model...
Resource Type:: Masters Thesis
Full Text:: , 2005. Title: Simulating Changing Diameter Distributions in a Softwood Sawmill. Charles Brunner Timo y

Using discrete-event simulation to study the influence of log yard sorting on sawmill processing efficiency of small-diameter timber

Creator:: Pinon, Olivia J.
Abstract:: A sawmill is similar to other manufacturing enterprises when it comes to making decisions, scheduling production and meeting customer demands. In order to help sawmills achieve their goals, and because there is such a high degree of variability in the raw material used in this industry, computer simulation has proven...
Resource Type:: Masters Thesis
Full Text:: Small-Diameter Timber Abstract approved: / James W. Funck / Timothy C. Kennedy A sawmill is similar

Dynamic finite element analysis of micropolar elastic materials

Creator:: Kim, Jong-bum, 1960-
Abstract:: In granular or fibrous materials, in which the dimensions of the internal structure can be of the same order of magnitude as major flaws or holes, classical elasticity theory does not consistently provide accurate models of the large stress gradients that may develop. With the incorporation of additional rotational degrees...
Resource Type:: Dissertation

A study of cavitation instabilities in solids

Creator:: Puttapitukporn, Tumrong
Abstract:: Cavitation instabilities in elastic-plastic solids under spherically-symmetric and axisymmetric loadings were investigated using the finite element method. Both quasi-static and dynamic analyses were used to solve these problems. In the quasi-static analyses, we investigated a cavitation instability in elastic/perfectly-plastic, linear hardening elastic-plastic, power hardening elasticplastic, and constrained silver materials. Here,...
Resource Type:: Dissertation
Full Text:: degree of Doctor of Philosophy in Mechanical Engineering presented on February 27, 2003. Tile: A Study of

A study of forces on simulated heat exchange tubes immersed in a cold fluidized bed

Creator:: Donovan, Jerry Eugene
Abstract:: The object of this research, project was to study how different parameters effect the magnitude and frequency composition of forces exerted on simulated heat exchange tubes immersed in a cold fluidized bed. Two arrays of tubes were assembled with the tubes mounted in an equilateral triangular pitch pattern. The center...
Resource Type:: Masters Thesis
Full Text:: A study of forces on simulated heat exchange tubes

A nonlocal damage theory for laminated plate with application to aircraft damage tolerance

Creator:: Nahan, Matthew F.
Abstract:: Design of commercial aircraft structure, composed of composite material, requires the prediction of failure loads given large scale damage. In particular, a fuselage of graphite/epoxy lamination was analyzed for damage tolerance given a standard large crack that severed both skin and internal structure. Upon loading, a zone of damage is...
Resource Type:: Dissertation
Full Text:: et al., 1995 & Kennedy & Nahan, 1996). Nonlocal averaging has typically employed a radially varying

A comparison of experimental mode I analysis methods for the interlaminar fracture toughness characterization of graphite/epoxy composite materials

Creator:: Keary, Paul Edward
Abstract:: Three approaches for evaluating mode I interlaminar strain energy release rates in graphite/epoxy composites were compared using experimental data from double cantilever beam specimens. Expressions for evaluating strain energy release rates were arrived at based on assumptions regarding specimen geometry and material behavior. The calculations included the direct method of...
Resource Type:: Masters Thesis
Full Text:: A comparison of experimental mode I analysis methods for

Development of acoustic emissions testing procedures applicable to conventionally reinforced concrete deck girder bridges subjected to diagonal tension cracking

Creator:: Lovejoy, Steven C.
Abstract:: A need exists to develop a non-destructive testing technique that can identify the formation and propagation of diagonal tension cracks in conventionally steel reinforced concrete deck girder (RCDG) highway bridges in the State of Oregon. Such a technique could be included into a structural health monitoring (SHM) system installed on...
Resource Type:: Dissertation
Full Text:: : Timothy C. Kennedy A need exists to develop a non-destructive testing technique that can identify

Failure analysis of pre-notched composite laminated plates under four-point bending conditions

Creator:: Arias Gonzales, Sergio
Abstract:: Ever since composite laminate technology was introduced into the aerospace and automotive industry, there has been a need to fully understand the damage progression experienced by composite laminated plates in the presence of a notch. While numerous research studies have been conducted on this matter when subjected to in-plane loads,...
Resource Type:: Dissertation
Full Text:: . Kennedy Ever since composite laminate technology was introduced into the aerospace and automotive

Numerical study of natural convection in square partitioned and non-partitioned enclosures

Creator:: Sukkaset, Prasart
Abstract:: Heat transfer characteristics and associated temperature and flow fields for natural convection in two-dimensional, square, partitioned and non-partitioned enclosures have been determined for Grashof numbers ranging from 10³ to 10⁶. The vertical side walls of the enclosure are isothermal with all other surfaces assumed to be adiabatic. An adiabatic partition...
Resource Type:: Dissertation
Full Text:: privacy Prqgessor James R. Wel Heat transfer characteristics and associated tem- perature and flow

Elastodynamic analysis of a propagating finite crack in a micropolar elastic solid

Creator:: Han, Seog-young
Abstract:: A dynamic propagation of a finite crack of opening mode in a micropolar elastic solid was investigated. By using an integral transform method, a pair of twodimensional singular integral equations governing stress and couple stress was formulated in terms of the displacement transverse to the crack, macro- and microrotations, and...
Resource Type:: Dissertation
Full Text:: Elastodynamic analysis of a propagating finite crack in a

Characterization of flow boiling in a fractal–like branching microchannel network

Creator:: Edward, Lee M.
Abstract:: Based on experimental investigations the present study evaluates flow instability and void fraction in a fractal-like branching microchannel network with rectangular cross-section. The hydraulic diameter of the channels ranged from 308μm at the inlet to 143μm at the outlet. The flow network used is characterized by set branching ratios for...
Resource Type:: Masters Thesis
Full Text:: Abstract approved: ________________________________________________________________________ James A

A model for the mechanical behavior of irradiated mixed carbide sphere pac fuel pins

Creator:: George, Thomas L.
Abstract:: A model is developed that allows the prediction of the stress-strain distribution in a mixed carbide sphere pac fuel pin during irradiation. The model is coupled with a previously developed model for the thermal behavior of the pin. The one-dimensional (radial at various axial locations) solution is for quasi-steady pin...
Resource Type:: Dissertation
Full Text:: . \Kennedy, K.L Peddicord A model is developed that allows the prediction of the stress- strain

Vortical Structures in Transition to Turbulence through Randomly Packed Porous Media: Scale, Energy, and Mixing Characteristics

Creator:: Mohammadi Ziazi, Reza
Abstract:: Vortical structures are the driving mechanism of transition to turbulence in porous media requiring adequately resolved observations along with analysis of the scale and energy of ﬂow within the pores. Of speciﬁc interest is to understand the vortex dynamics, energy, and turbulent mixing and transport properties in the scale of...
Resource Type:: Dissertation
Full Text:: Mixing Characteristics Abstract approved: James A. Liburdy Vortical structures are the driving

The application of a band variable-inertia flywheel to an urban transit bus

Creator:: Moosavi-Rad, Hamid
Abstract:: This dissertation investigates by means of computer simulation the potential of a Band Variable-Inertia Flywheel (BVIF) to store energy for an urban transit bus. Replacing both a fixed-inertia flywheel (FIF) and a continuously variable transmission (CVT), the Band Variable-Inertia Flywheel is capable of accelerating a vehicle from rest to a...
Resource Type:: Dissertation
Full Text:: potter's wheel. James Watt was the first modern inventor to put a variable-inertia flywheel to practical

Response of guyed offshore towers to stochastic loads in the presence of steady current

Creator:: Brynjolfsson, Sigurdur
Abstract:: The validity of the widely used stochastic linearization method for analysing the response of guyed towers to stochastic loads is investigated. The governing equations of a guyed tower have two main sources of nonlinearities, fluid-structure interaction and the restoring force of the cables. In this study, two models are considered....
Resource Type:: Dissertation
Full Text:: : / Dr. John W. Leonard Redacted for Privacy Dr. Timothy C. Kennedy The validity of the widely used

Experimental and finite-element analysis of stress distributions near the end of reinforcement in partially reinforced glulam

Creator:: Kirlin, Chad P.
Abstract:: Recently, fiber-reinforced plastics (FRP lamina) have been applied to glued-laminated (glulam) timber for the purpose of improving bending strength and stiffness. Initially, full length reinforcement using FRP lamina was developed. However, the cost of FRP lamina is a significant portion of the total cost of reinforced glulam. Therefore, it is...
Resource Type:: Masters Thesis

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