Index Catalog // ScholarsArchive@OSU

Developing New Routes for Mechanical Characterization of Metal-Organic Frameworks

Creator:: Maack, Bryan A.
Abstract:: Metal-organic frameworks (MOFs) represent an exciting, new class of porous materials. Their hybrid organic-inorganic structure opens up near infinite possibilities to tune and design their structure for specific properties and applications. A new generation of flexible MOFs, following a generation of stiff MOFs, has created additional design space and complexity....
Resource Type:: Masters Thesis
Full Text:: : Developing New Routes for Mechanical Characterization of Metal-Organic Frameworks Abstract

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

Development of a new mixture proportioning method and assessing the influence of material characteristics on flowing concrete mixtures

Creator:: Hendrix, Greg
Abstract:: Cast-in-drilled-hole (CIDH) piles are often constructed to depths that are inaccessible to internal vibration of the concrete. Internal vibration is necessary to consolidate the concrete and, if not performed, then typically inspection pipes are necessary to detect the presence of voids in CIDH piles. Void detection is critical to assessing...
Resource Type:: Masters Thesis

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

Fibers Microbuckling of Uncured Carbon-Epoxy Prepreg in Bending

Creator:: Guo, Yizhi
Abstract:: Prepreg is widely used in composite manufacturing with advanced composites such as carbon and aramid. The material is characterized by a degree of flexibility (drape) and stickiness (tack), which allows an efficient layup on molds with complex shapes. However, axial instability of compressed fibers during the molding process may occur,...
Resource Type:: Masters Thesis
Full Text:: ABSTRACT OF THE THESIS OF Yizhi Guo for the degree of Master of Science in Mechanical Engineering

Advancing Robotic Grasp Planning using Human Heuristics for Grasp Similarity

Creator:: Dixit, Saurabh Milind
Abstract:: This thesis explores the use of human kinesthetic input to advance robotic grasp planning. It specifically focuses on identification of human heuristics of grasp similarity by extensive human-subject experiments. This heuristic is then utilized to develop a robust metric for identifying similar robotic grasps. The central hypothesis of this work...
Resource Type:: Masters Thesis
Full Text:: : Major Professor, representing Robotics Head of the School of Mechanical, Industrial and Manufacturing

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

Estimating spatial changes in acoustic velocity in felled Douglas-fir stems

Creator:: Dowding, Bodie
Abstract:: To compete with other building materials, the wood products industry must find a way to increase value and lower costs. Wood stiffness is important for most wood uses. Value can be increased and costs can be lowered by sorting logs for stiffness in the woods using acoustic devices mounted on...
Resource Type:: Masters Thesis
Full Text:: the most important mechanical properties for most wood uses (Xu et. al. 2004). The structural use

The dynamic shear moduli of blubber for selected large whale species

Creator:: Summers, Michael P.
Abstract:: Whale blubber is the insular tissue layer located between the dermis and the superficial fascia layer which sheathes the whale's musculature. It is made up of a lipid matrix ramified with strong, structural collagen and elastic fiber bundles, but little is known of its mechanical properties. Knowing these properties adds...
Resource Type:: Masters Thesis
Full Text:: measurements of the complex dynamic shear modulus (G*=G’+iG”), a viscoelastic mechanical property, of

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

Heat treatment effects on CPM-M4 tool steel performance as edged blade material

Creator:: Lian, Sidi
Abstract:: CPM-M4 tool steel is a commonly used knife blade material due to its high strength and wear resistance. The goal of this thesis is to understand how heat treatment parameters affect blade performance and microstructure.Five heat treatments were applied to CPM-M4 steel by varying austenitizing and tempering temperatures. The microstructures...
Resource Type:: Masters Thesis

Fracture properties of balsa wood and balsa core sandwich composites

Creator:: Shir Mohammadi, Meisam
Abstract:: Favorable properties of Balsa wood make it an interesting alternative in a number of applications including thermal insulation or as a lightweight core material in sandwich composites. Increasing use in construction necessitates a better understanding of its mechanical and failure properties. In the present work, mode I and mode II...
Resource Type:: Masters Thesis
Full Text:: betterunderstanding of its mechanical and failure properties. In the present work, mode Iand mode II fracture

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

Evaluation of Oregon Tack Coat Performance to Reduce Tracking and Increase Interlayer Shear Strength of Asphalt Pavements

Creator:: Covey, David J.
Abstract:: CSS-1H is the most commonly used slow-setting emulsion grade in Oregon. “New” engineered emulsions were recently developed in Oregon to reduce tracking, the pick-up of tack coats by construction vehicle tires during construction activities, and increase interlayer shear strength (ISS), the amount of adhesive bond present between layers of asphalt...
Resource Type:: Masters Thesis

Study of Interphase in Polylactic Acid and Cellulose Nanocrystal Composite Films

Creator:: Rao, Pratish Ramesh
Abstract:: Polylactic acid (PLA), a renewable material, is used widely in a variety of commercial and specialty applications. However, certain limitations such as high temperature stability and brittleness limit its applicability. This problem is addressed by reinforcing PLA with a variety of materials but the process gives rise to different issues...
Resource Type:: Masters Thesis
Full Text:: mechanical properties and trends are established with reference to the graft length. In addition, DSC and

Modeling Implantable Passive Mechanisms for Modifying the Transmission of Forces and Movements between Muscle and Tendons

Creator:: Homayouni, Taymaz
Abstract:: This thesis explores the development of biomechanical models for evaluating a new class of passive mechanical implants for orthopedic surgery. The proposed implants take the form of passive engineered mechanisms and will be used to improve the functional attachment of muscles to tendons and bone by modifying the transmission of...
Resource Type:: Masters Thesis
Full Text:: of Master of Science in Mechanical Engineering presented on June 2, 2015. Title: Modeling

The Influence of Hip Abduction, Extension, and External Rotation Rate of Torque Development on Frontal-Plane Biomechanics during Single-Leg Jump-Cuts

Creator:: Cronin, Baker
Abstract:: Anterior cruciate ligament injuries are relatively common in female athletes with greater frontal plane knee motion and loading during a landing task predictive of injury. As a result, decreasing knee abduction motion and loading is important for ACL injury prevention. While increased strength of the hip abductors, extensors, and external...
Resource Type:: Masters Thesis

Evaluation of Abaqus for simulating quasi-static Mode III shear of edge notched carbon fiber reinforced polymer panels

Creator:: Hyder, Imran
Abstract:: The ability to engineer stiffness and strength in any desired direction make composites an ideal material candidate for various applications when compared to their traditional isotropic counterparts. In spite of this, the ability to model the material response in composites has yet to be fully explored. Composite research largely focuses...
Resource Type:: Masters Thesis

Theoretical modeling and experimental analysis of the flight mechanics of Lepidoptera

Creator:: Wilson, Tyler
Abstract:: Development of micro air vehicles has led to a strong interest in the biomechanics of flapping fliers such as bats, birds, and insects, due to their ability to perform extreme unsteady maneuvers and fly in confined spaces. Determining the methods and mechanisms used by these fliers is a valuable source...
Resource Type:: Masters Thesis
Full Text:: in Mechanical Engineering presented on June 13, 2013. Title: Theoretical Modeling and

Advancing the understanding of bulk metallic glasses as structural materials through exploration of mechanical properties

Creator:: Naleway, Steven E.
Abstract:: Bulk metallic glasses (BMGs) offer a great deal of potential through their near-theoretical strength, potentially high toughness and unique forming and molding traits. However, there are still a number of outstanding issues that bar their widespread use. This thesis describes the investigation of three research questions each designed to further...
Resource Type:: Masters Thesis
Full Text:: Glasses as Structural Materials through Exploration of Mechanical Properties AN ABSTRACT OF THE

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

An experimental approach to analyze large notched composite panels loaded in out-of-plane shear

Creator:: Froemming, Tyler M.
Abstract:: Identifying material characteristics of composites is important in designing any structural system. The aerospace industry relies on these material properties not only to design a functional aircraft, but also a safe and reliable one. Since carbon fiber composites are relatively new materials, little is known about its characteristics under certain...
Resource Type:: Masters Thesis
Full Text:: ABSTRACT OF THE THESIS OF Tyler M. Froemming for the degree of Master of Science in Mechanical

Application of digital image correlation in material parameter estimation and vibration analysis of carbon fiber composite and aluminum plates

Creator:: Chuang, Chih-Lan Jasmine
Abstract:: Identifying material parameters in composite plates is a necessary first step in a variety of structural applications. For example, understanding the material parameters of carbon fiber composite is important in investigating sensor and actuator placement on micro-air-vehicle wings for control and wing morphing purposes. Knowing the material parameters can also...
Resource Type:: Masters Thesis
Full Text:: degree of Master of Science in Mechanical Engineering presented on May 1, 2012. Title: Application of

Direct coupling of imaging to morphology-based numerical modeling as a tool for mechanics analysis of wood plastic composites

Creator:: Lin, Xiang
Abstract:: Polymeric composites reinforced with bio-materials have advantages over composites with synthetic reinforcements. Bio-based composites use low-cost and renewable reinforcements, have nonabrasive properties for machining, have improved damping characteristics, and have potential for energy recycling. However, the limited use of bio-based composites is because their mechanical properties are typically much lower...
Resource Type:: Masters Thesis
Full Text:: overall mechanical property enhancements were with ponderosa pine particles. Another important factor

Optimizing the performance of gypsum wall board in wood frame shear walls

Creator:: Goodall, Scott I.
Abstract:: The overall goal of this project was to design a wood frame shear wall that could withstand greater displacement before damage occurred to the Gypsum Wall Board (GWB). More specifically, the objectives of the study were: (1) to evaluate damage to the GWB in alternative shear wall designs at 1%,...
Resource Type:: Masters Thesis
Full Text:: Variation in Mechanical Property Results ......................................................... 171

Using Acoustic Measurements and Inventory Data to Estimate Stiffness in Standing Douglas-Fir Trees

Creator:: Delgado Trejo, Jorge Luis
Abstract:: Total US lumber production in 2011 was 77.9 million cubic meters. Its primary use was for housing and construction. There is a growing concern that the structural properties for wood are being reduced as trees are harvested at much younger ages as the wood supply shifts from older to younger...
Resource Type:: Masters Thesis
Full Text:: manufacturing facilities to generate the products that will meet these needs. Mechanical and physical

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

Two Studies Addressing Practical Needs of Wheat Farmers, Processors, and Breeders : Changes in Falling Number and Alpha-amylase During Grain Storage, and Improved Predictions of Wheat-flour Dough Properties

Creator:: Adams, Mike R.
Abstract:: Wheat (Triticum aestivum) is a globally traded staple food crop. The diverse and pleasing nature of wheat-derived products is a result of the complex interactions of the polymeric components from the wheat endosperm. Changes in the functionality of these polymeric components, as a result of changes in growing conditions or...
Resource Type:: Masters Thesis
Full Text:: mechanical energy (mixing). The unique ability of gluten to create leavened products arises from its

Ionic Cross-linked Cellulose Nanocrystals Composites of Poly(vinyl acetate)

Creator:: Chan, Han Ling
Abstract:: Understanding the effect on the materials mechanical properties from the perspective of interfacial interaction between the filler and the polymer matrix has become an important criterion in polymer nanocomposites field. Cellulose nanocrystals (CNCs) are renewable materials that can be extracted from natural sources, such as wood, cotton, and tunicates. In...
Resource Type:: Masters Thesis
Full Text:: ). Abstract approved: John Simonsen Understanding the effect on the materials mechanical properties from

The Effect of Exercise on the Biomechanical Determinants of Knee Energy Absorption during Single-leg Jump-cuts

Creator:: Pollard, Anne E.
Abstract:: Anterior cruciate ligament injuries are common in a wide variety of sports and most frequently occur during activities requiring rapid deceleration such as landing and cutting. Deceleration of the body's center of mass during movement results primarily from eccentric muscle contraction. This type of contraction serves to absorb energy from...
Resource Type:: Masters Thesis

Finite element modeling of gusset plate failure using OpenSees

Creator:: Walker, Andrew J.
Abstract:: The collapse of the I-35W Bridge in Minneapolis, MN in 2007 prompted an investigation into the design and inspection of the steel truss bridges. Further investigation into the collapse revealed that a gusset plate experienced sway buckling, causing the bridge failure. This bridge failure motivated research into the analysis and...
Resource Type:: Masters Thesis
Full Text:: equations are conservative, but not necessarily accurate. Examining the mechanical properties of gusset

Influence of transport parameters on the fresh and hardened characteristics of ready-mixed concrete

Creator:: Chen, Jiaming
Abstract:: Most specifications for ready-mix concrete (RMC) limit mixing time to 90 minutes and/or truck drum revolution counts (DRC) to 300 before discharge. These specifications have been in place for many years with the objective of ensuring the quality and performance of the finished concrete product. However, limited research has been...
Resource Type:: Masters Thesis
Full Text:: research indicate that mixing time and truck DRC have no detrimental effects on the mechanical properties

Design, analysis, and validation of composite c-channel beams

Creator:: Koski, William C.
Abstract:: A lightweight carbon fiber reinforced polymer (CFRP) c-channel beam was previously designed using analytical theory and finite element analysis and subsequently manufactured through a pultrusion process. Physical testing revealed the prototype did not meet the bending and torsional stiffness of the beam model. An investigation revealed that the manufactured prototype...
Resource Type:: Masters Thesis
Full Text:: . Koski for the degree of Master of Science in Mechanical Engineering presented on September 6, 2012

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

Flexural steel anchorage performance at diagonal crack locations

Creator:: Triska, Mary Ann
Abstract:: Large numbers of reinforced concrete deck girder bridges that were constructed during the interstate system expansion of the 1950s have developed diagonal cracking in the stems. Compared to the present AASHTO-LRFD standards, the provisions of the 1950s allowed for higher shear stress in the concrete, thus reducing the amount of...
Resource Type:: Masters Thesis
Full Text:: modern deformed bars, tests showed that the presence of deformations produced mechanical engagement

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

Heat Treatment Effects on the Mechanical Properties and Microstructure of CPM-M4 Tool Steel

Creator:: Fast, Cody P.
Abstract:: Variations in heat treatments have significant effects on the microstructure of tool steels. For CPM-M4 tool steel, the changes in microstructure and mechanical properties were observed based off of variations in temperature. Five heat treatments with constant exposure time and variable austenitizing and tempering temperatures were performed on samples of...
Resource Type:: Masters Thesis
Full Text:: - and macroscopic mechanical property data. Changes in mechanical properties on the macro-scale are

Role of Stoichiometry on Ordering in Ni-Cr Alloys

Creator:: Teng, Fei
Abstract:: Mechanical property degradation due to isothermal ageing is of potential concern for alloys based on the Ni-Cr binary system (e.g., Inconel 690, 625), particularly in nuclear power applications where component lifetimes can exceed 40 years. In the present research, the disorder-order phase transformation, which is the primary mechanism of ageing,...
Resource Type:: Masters Thesis
Full Text:: Mechanical property degradation due to isothermal ageing is of potential concern for alloys based on the Ni

The Effects of Construction Practices on Concrete Construction Joint Performance

Creator:: Panduranga Setty, Shreyas
Abstract:: Concrete is the most widely used construction material in the world. When constructing large concrete structures, concrete may have to be placed in multiple lifts. In these cases, fresh concrete is placed on hardened concrete. The interface that is formed between these two lifts of concrete is known as a...
Resource Type:: Masters Thesis
Full Text:: concrete established by a combination of mechanical interlocking of the particles; and iii) dowel action

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

Behavior of Cross-Laminated Timber Diaphragm Panel-to-Panel Connections with Self-Tapping Screws

Creator:: Sullivan, Kyle
Abstract:: The goal of this project is to contribute to the development of design values for cross-laminated timber (CLT) diaphragms in the seismic load-resisting system for buildings. Monotonic and cyclic tests to determine strength and stiffness characteristics of 2.44 m (8 ft) long shear connections with common self-tapping screws were performed....
Resource Type:: Masters Thesis
Full Text:: ) plywood splines, 52.5mm (2.06 in) 3-ply CLT, and vertical self-tapping screws in shear produced

Role of Alloying on the Thermal Stability of Duplex Stainless Steel

Creator:: Garfinkel, David
Abstract:: Duplex stainless steels (DSS) are an attractive potential material in nuclear power generation systems due to an excellent combination of corrosion resistance, strength, toughness, and affordability. Thermal embrittlement caused by phase instability in the temperature range of ~300-550°C severely limits the service temperature of DSS. The rate of embrittlement varies...
Resource Type:: Masters Thesis
Full Text:: was found to be the most likely explanation for the reduced mechanical degradation

Students' Conceptual Understanding of Mechanics and Materials for Axial and Bending Load Cases

Creator:: Berger, Amber D.
Abstract:: As people learn new concepts, they experience a process termed conceptual change. There are several theories that attempt to explain conceptual change, and this paper uses the framework theory to explain how students learn mechanics of materials. Semi-structured interviews with ninety students were qualitatively analyzed for this research in an...
Resource Type:: Masters Thesis

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