Index Catalog // ScholarsArchive@OSU

Dynamic mechanical analysis of wood and wood-based composites

Creator:: Gao, Hong
Abstract:: Wood and wood-based composites are being used in either new or more demanding applications. A means is needed to successfully analyze new materials and to predict their long-term performance. Two techniques, dynamic mechanical analysis (DMA) and time-temperature superposition (TTS) offer a means to accomplish this objective. The outcome of this...
Resource Type:: Dissertation
Full Text:: of Philosophy in Forest Products presented on August 22, 1994. Title: Dynamic Mechanical Analysis

The effects of growth rate and cambial age on wood properties of red alder (Alnus rubra Bong.) and Oregon white oak (Quercus garryana Dougl.)

Creator:: Lei, Hua
Abstract:: This study was to investigate effects of growth rate and cambial age on properties of wood from two increasingly used hardwood species, red alder (Alnus rubra Bong.) and Oregon white oak (Quercus garryana Dougl.), for better understanding factors affecting wood quality in hardwoods. Thirty 7-year-old trees grown at widely varying...
Resource Type:: Dissertation
Full Text:: Proportion of cell-types 10 Specific gravity 13 Mechanical properties 17 Juvenile Wood 17 Effect of Growth

Influence of silt size and content on static liquefaction potential of sand

Creator:: Monkul, M. Murat
Abstract:: Different specimen preparation methods such as moist tamping, dry funnel deposition, slurry deposition, dry air pluviation have been reported in the literature to investigate the undrained behavior of silty sands. Similarly, different means have been used to densify the soils prepared with such methods. However, the influence of the densification...
Resource Type:: Dissertation
Full Text:: deposited specimens. Densification of the specimens is performed via mechanical vibrator or soft

Bioactive glass filled resin composites : mechanical properties and resistance to secondary tooth decay

Creator:: Khvostenko, Dmytro
Abstract:: Dental resin composites are widely used in modern dentistry due to their aesthetic appearance. However, resin based restorations have inferior mechanical properties (fracture is the second reason for restorations replacement) in comparison to alloy based composites and their antimicrobial properties still remain poor, leading to secondary tooth decay development on...
Resource Type:: Dissertation
Full Text:: . Title: Bioactive Glass Filled Resin Composites: Mechanical Properties and Resistance to Secondary

Characterization of load transfer in wood-based composites

Creator:: Schwarzkopf, Matthew John
Abstract:: The mechanical performance of composite materials is determined by the mechanical properties of their individual components and the effective load transfer between these components. Binders are commonly used to bond composite components together and to provide effective load transfer between them. In wood-based composites the binder-component load transfer occurs at...
Resource Type:: Dissertation
Full Text:: : ________________________________________________________________________ Lech Muszyński The mechanical performance of composite materials is determined by the

Leg spring model related to muscle activation, force, and kinematic patterns during endurance running to voluntary exhaustion

Creator:: Dutto, Darren John
Resource Type:: Dissertation
Full Text:: effect of physiological, neurological, and mechanical parameters. Finding factors from each system

Behavior of gypsum-sheathed cold-formed steel wall stud panels

Creator:: Lee, Young-ki
Abstract:: This study consists of three parts: 1) Part A: Limiting Height Evaluation for Composite Wall Tests, 2) Part B: Mid-Span Deflection Evaluation for Composite Wall Tests, and 3) Part C: Nominal Axial Strength Evaluation for Wall-Braced Wall Stud Columns. The purpose of Part A is to develop experimentally-based limiting heights...
Resource Type:: Dissertation
Full Text:: panels consist of steel studs with different materials, such as fiber board, plywood, or gypsum board

Developing Design Model for Cellulose Nanocomposites

Creator:: Shir Mohammadi, Meisam
Abstract:: Today nano scale materials are being used for wide range of applications. One promising topic in nano scale materials is using them for reinforcement of different polymeric materials to reach desirable stiffness properties. The stiffness of these materials is mostly found experimentally because the nanocomposite community lacks a decent analytical...
Resource Type:: Dissertation
Full Text:: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 5.2.2 Nanocomposite Fabrication . . . . . . . . . . . . . . . . . . . . . 104 5.2.3 Mechanical

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:: Doctor of Philosophy in Mechanical Engineering presented on June 1 1993. Title: Three-Dimensional

Numerical modeling and experiments on wood-strand composites

Creator:: Le, Edward A.
Abstract:: In wood-based composites, the glue-line (interface) between wood-strands affects the stress transfer from one member to the next. The glue-line properties determine the rate of load transfer between phases and these properties depend on wood species, surface preparation, glue properties, glue penetration into wood cells, and moisture content of the...
Resource Type:: Dissertation

Functional decreases in hydraulic and mechanical properties of field-grown transgenic poplar trees caused by modification of the lignin synthesis pathway through downregulation of the 4-coumarate:coenzyme A ligase gene

Creator:: Voelker, Steven L.
Abstract:: Society uses massive quantities of wood fiber in production of paper, and demand for fiber is projected to increase further as production of biofuels from fermentation of plant cellulosic materials increases. Because these end uses generally require the costly step of removing of lignin, wood with reduced or more easily...
Resource Type:: Dissertation
Full Text:: Mechanical Properties of Field-grown Transgenic Poplar Trees Caused by Modification of the Lignin Synthesis

Comparison of leg spring characteristics during running using mass-spring-damper modeling

Creator:: Watanatada, Pasakorn
Abstract:: During heel-toe running, the vertical ground reaction force (VGRF) profile has both impact and active peaks. Although the mass-spring model (a single mass and a linear spring) is simple and useful to predict running characteristics, its simulation of VGRF profiles produces only a single peak rather than the double peak...
Resource Type:: Dissertation
Full Text:: . The two-degree of freedom mechanical model .............................. 96 A.4. The mathematical

Biochemical and gelation properties of fish protein isolate prepared under various pH and ionic strength conditions

Creator:: Thawornchinsombut, Supawan
Abstract:: A novel method for isolating fish proteins by shifting pH to high acid or high alkali pH was the focus of the study. Biochemical and physicochemical properties of various pH-treated soluble fish proteins as a function of ionic strength were determined. Effect of ionic strength and various storage conditions on...
Resource Type:: Dissertation
Full Text:: modulate protein property and functionality of pH-shift fish protein isolate; 2) proteins recovered at

Mechanical behavior of coniferous trees subjected to wind loading

Creator:: Moore, John R.
Abstract:: The behavior of coniferous trees subjected to wind loading was investigated through a series of experiments and also through simulation modeling. Previous studies that measured the natural oscillation frequencies and damping ratios were reviewed and equations were developed for predicting the natural frequency of a tree from the ratio of...
Resource Type:: Dissertation

Mechanical stresses in trees resulting from strain compatibility in an anisotropic material

Creator:: Lyons, Charles Kevin
Abstract:: Consider the bole of a tree to consist of a linear elastic material that is orthotropic with respect to the cylindrical coordinates. When the bole of a tree is subjected to resultant loads in the directions of the Cartesian base vectors, the S₁₁, S₂₂, S₃₃, and S₁₂ stresses in Cartesian...
Resource Type:: Dissertation

Defining intensity of skeletal loading in children

Creator:: Bauer, Jeremy J.
Abstract:: While exercise can be prescribed for improving cardiovascular and muscle health, no prescription exists for increasing bone mass. Because bone deformation rate has been identified as an important variable related to osteogenesis, estimates of skeletal loading during human activities likely characterize the associated osteogenic stimulus. However, estimates of body segment...
Resource Type:: Dissertation
Full Text:: introduced me to my minor professor in Mechanical Engineering, Mark Costello. In the first few years of my

Investigation of Styrene-Free Unsaturated Polyester Resins for Fiber-Reinforced Composites

Creator:: Wu, Yili
Abstract:: Most of existing commercial unsaturated polyester (UPE) resins are typically composed of a UPE and a high amount of highly volatile, flammable, and toxic styrene. The emission of hazardous styrene in the handling of the UPE resins and the preparation and use of fiber-reinforced UPE composites poses severe hazards to...
Resource Type:: Dissertation
Full Text:: mechanical analyses. Mechanical properties such as flexural and tensile properties of the composites were

Applications of Holographic Optical Tweezers: Multiplexed Fluorescence Spectroscopy and the Micromechanics of Type-I Collagen

Creator:: Cibula, Matthew A.
Abstract:: The development and some applications of holographic optical tweezers (HOT) are presented. Our HOT system uses a spatial light modulator (SLM) to control the location and properties of the optical trap. We have developed a method for optimizing the diffraction efficiency of a SLM that can be applied in situ...
Resource Type:: Dissertation
Full Text:: primary source of its mechanical properties. Collagen gels are often approximated as homogeneous elastic

Angular correlation measurements from the β decay of ¹⁶⁶mHo and ¹⁶⁶Tm and the properties of the gamma vibrational band in ¹⁶⁶Er

Creator:: Loats, Jeffrey T.
Abstract:: Angular correlations of gamma rays from excited states of ¹⁶⁶Er have been measured following the β decays of ¹⁶⁶ Ho (Jπ =7-, t 1/2 =1200y, Q= 1854 ke V) and ¹⁶⁶Tm (Jπ = 2+, t 1/2, = 7.7h, Q=3040 keV). Data was collected using the 8π spectrometer, an array of...
Resource Type:: Dissertation
Full Text:: " of the nuclear state. As with any quantum mechanical angular momentum, the total spin J has a

Characterization of rheological properties and thermal stability of fish myofibrillar proteins

Creator:: Esturk, Okan
Abstract:: Effects of moisture content, pH, and salt concentration on dynamic rheological properties and gel fracture quality of Pacific whiting surimi were investigated. Torsion tests showed that shear stress decreased rapidly and strain values decreased gradually as moisture concentration increased. As pH increased, fracture shear stress and strain values increased, whereas...
Resource Type:: Dissertation
Full Text:: be used to monitor the physical property changes that relate to the molecular structure of a

Modeling changes in flexural properties of softwood beams during fungal decomposition

Creator:: Mitsuhashi Gonzalez, June M.
Abstract:: Moisture intrusion in residential structures can lead to substantial fungal decay and this damage costs billions in repair/replacement costs. The extent of damage and the rate at which it occurs are primarily dependent on the wood moisture content and temperature in the structure. Determining the risk of decay for various...
Resource Type:: Dissertation
Full Text:: evidence showing that fungi cause dramatic losses in the mechanical and flexural properties of wood at

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:: Sergio G. Arias for the degree of Doctor of Philosophy in Mechanical Engineering presented on February

Mechanistic aspects of fracture and fatigue in resin based dental restorative composites

Creator:: Shah, Minalben B.
Abstract:: For resin based dental restorative composites, one of the major challenges is to optimize the balance between mechanical and optical properties. Although fracture is the second leading cause of dental restorative failures, very limited mechanistic understanding exists on a microscopic level. In the present study, the fracture properties and mechanisms...
Resource Type:: Dissertation
Full Text:: major challenges is to optimize the balance between mechanical and optical properties. Although

In-forest log segregation based on acoustic measurement of wood stiffness

Creator:: Amishev, Dzhamal Y.
Abstract:: To remain competitive, the forest products industry needs to look for new and innovative processes and technologies to not only reduce costs but also to recover more value through the entire seedling-to-customer forest products supply chain. It is well recognized that measuring wood properties of logs in real time during...
Resource Type:: Dissertation
Full Text:: modulus of elasticity (MOE), also known as stiffness, is an important mechanical property and is the

First principles studies of optical, electronic and mechanical properties of organic molecules and solids

Creator:: Barras, Faye Lyn
Abstract:: This thesis presents the results of quantum-mechanical first principles calculations of optical, electronic and mechanical properties of organic molecules and solids, which have diverse potential applications such as photovoltaics, flexible electronics, and mechanical catalysts with applications in force sensors and self-healing materials. The electronic and optoelectronic properties of organic thin...
Resource Type:: Dissertation
Full Text:: Optical, Electronic and Mechanical Properties of Organic Molecules and Solids. Abstract approved

The effect of elevated temperature on mechanical behavior of structural wood and wood-based composites

Creator:: Sinha, Arijit
Abstract:: Engineers, in practice, are often faced with the challenge of evaluating a fire-damaged structure and developing a rehabilitation and retrofit plan. In order to decide on a rehabilitation and retrofit plan, information on thermal degradation of building materials and connections are vital. A critical knowledge gap exists in terms of...
Resource Type:: Dissertation
Full Text:: 10, 2010. Title: The Effect of Elevated Temperature on Mechanical Behavior of Structural Wood

From running birds to walking robots : optimization as a unifying framework for dynamic bipedal locomotion

Creator:: Hubicki, Christian M.
Abstract:: Bipedal locomotion is a complex phenomenon to understand and control, making it difficult for legged robots to achieve the speed, agility, efficiency, and robustness of their animal counterparts. This thesis argues for the use of numerical optimization to investigate and implement bipedal control as it applies to biology, dynamical models,...
Resource Type:: Dissertation
Full Text:: for the degree of Doctor of Philosophy in Robotics and Mechanical Engineering presented on December

Shrinkage study of high performance concrete for bridge decks

Creator:: Fu, Tengfei
Abstract:: In the field of civil infrastructure, bridge desks are typically constructed using high performance concrete (HPC). Concrete bridge decks demand qualities such as low permeability, high abrasion resistance, superior durability, and long design life. Over decades of field and laboratory experience, many HPC bridge decks have been found to be...
Resource Type:: Dissertation
Full Text:: , involving only free shrinkage and mechanical properties of HPC, was also identified

Biomechanics of dependent transfers on an aircraft

Creator:: Higginson, Brian Keith
Abstract:: The dependent transfer of a traveler with disabilities on board an aircraft places the transferors, as well as the traveler, at risk of disabling lower back injury. This risk is increased on board an aircraft due to the confined space in which the transfer takes place. The purpose of the...
Resource Type:: Dissertation

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