Engineering Commons^™

The Effects Of Heat Treatment On The Grain Growth, Phase Evolution, And Hardness Of Newly Developed Steel-Based Hardfacing Alloys For Industrial Applications, Renee Kuzniar

Materials Engineering

Steel-based hardfacing alloys are welded onto the outside diameter of tool joints in three beads with a slight overlap between welds for underground drilling to prolong the tool joints’ life. Current hardfacing alloys have a shortened life due to cracks occurring in neighboring weld beads. To decrease cracking, the effects of composition and heat treatment on the microstructure was investigated on five alloys. Five small arc-melt circular ingots roughly 1.4 x 0.3 inches were produced. Each sample had varying amounts of C, B, Cr, Mn, Mo, Nb, Si, Ti, V, and W. The carbon levels in the alloys were .91wt%, …

Grain Size Control In Post-Forged C263 Seamless Rolled Rings, Christopher Smith

Materials Engineering

Seamless rolled rings of C263 superalloy were forged by Carlton Forge Works in Paramount, CA and sectioned for mechanical testing. The as-forged ring sections were then machined into tensile samples. To simulate cold working done after Carlton’s forging process, the C263 tensile samples were strained using an Instron tensile tester to 1, 3, 5, 7, and 9% plastic strain. These tensile samples were then solution treated at 2100°F for 30 minutes and water quenched before being aged at 1470°F for 8 hours and air cooled, following Carlton Forge Works’ heat treatment process. The gauge length sections were metallographically prepared and …

Simplifying The Testing And Calculation Of Fracture Toughness Of Thermoplastic And Thermoset Matrix Composite Materials, James Shedden

Materials Engineering

Fracture toughness, or the ability of a material to resist fast fracture by crack propagation is an important property in the use of composite materials for structural designs. Other mechanical tests such as tensile, flexure, and compression are more established and practical than testing fracture toughness. Fracture toughness testing is less commonly used because it requires specific specimens and non-conventional test methods. In composite materials specifically, delamination of the plies of materials is tested for G_IC and G_IIC values to find the critical strain energy release rate of the two types of fracture modes. The common two tests …

Development Of A Production Line Appropriate Test For Teflon Adhesion On 304 Stainless Steel 0.01-0.03" Diameter Coronary Guide Wires, Danielle Dunham

Materials Engineering

A test was developed to determine relative adhesion of Teflon-coated 304 stainless steel guide wires. Two sets of wires were provided by Abbott Vascular for testing: one set was known to have poor Teflon adhesion, the other had acceptable adhesion. A prototype device was designed and manufactured that produced a shear force on the coating by dragging the wire under a ½ inch-diameter 440C hardened stainless steel cylinder. Testing consisted of increasing the force on the wire during each consecutive pass with the cylinder until the Teflon coating failed. The force on the wire during the failure producing pass was …

Residual Stress Measurement Of 7050 Aluminum Alloy Open Die Forgings Using The Hole-Drilling Method, Alexandra Viksne

Materials Engineering

Open die forged 7050 aluminum alloy has residual stresses that can be measured by the hole-drilling method following standard ASTM E837-01. Weber Metals (Paramount, CA) assumes that the stress is uniform throughout the thickness of an open die forged plate. Four different stress relieved 7050 aluminum samples were tested to confirm if the measurements by the hole-drilling method at the surface of a plate is indicative of the stress throughout. The different stress relief methods included: two water quenched samples at temperature ranges of 60°-90°F and 120°-130°F and two samples plastically deformed by forging at room temperature 1% and 3%. …

Analyzing The Flexural Properties Of Self-Constructed Bamboo Laminates, Brett Dorren

Materials Engineering

Bamboo plies of 1/8" and 1/32" thicknesses were glued together to form multiple unidirectional and cross-ply laminates that measured 12" by 12". The thickness of each laminate was between 0.25" and 0.375". All laminates were pressed together with a Tetrahedron MTP-10 bench top precision press at 75°F and 1000 lb_f for 40 minutes. Laminates were then cut with a band-saw into four 3" by 12" test specimens, 24 hours after pressing. Each test specimen was three-point bend tested to identify the modulus of rupture (MOR) and apparent bending stiffness. Three-point bend testing was also performed on laminates that were …

Evaluation Of High Phosphorus Electroless Nickel Platings To Protect Carbon Steel Heat Exchangers In Seawater Service, Nathan Brink

Materials Engineering

The purpose of this project was to determine the suitability of using a high phosphorus electroless nickel (HPEN) coating to prevent corrosion in carbon steel heat exchangers in seawater service. 1 in. x 4 in. samples were cut from ¼ in. SA-516-70 pressure vessel plate, pickled to remove mill scale, dressed with 300 grit sand paper and sent out for plating with 2 mils of HPEN. Due to a clerical error during plating, samples were plated to a significantly lesser extent than requested. Samples were plated with approximately 0.6 mils of HPEN versus the 2 mils requested, however this was …

Measuring The Mechanical Properties Of A Newly Developed Discontinuous Carbon Fiber And Epoxy Composite, Morgan Adams

Materials Engineering

Engineering firm Pratt & Miller have developed a new and previously untested carbon fiber/epoxy composite using a spray lay-up process similar to a process commonly used in fiberglass production. This new composite is made by using a pneumatic chop gun that simultaneously cuts the carbon fibers to a specific length and deposits the chopped fibers and resin onto surface of an exposed mold surface. The composite is then rolled down to flatten and better wet the fibers and then the whole mold is vacuum bagged at room temperature to cure. The flexural stiffness and flexural strength of the composite with …

Tensile Properties Of Adhesive Joints Between Alclad 2024-T3 Aluminum Sheets And Extruded 6061-T6511 Aluminum For Use In Ultralight Personal Aircraft, Kevin Jones

Materials Engineering

Cold cure two-part epoxy adhesives were tested in aluminum joints to investigate their viability for use in an ultralight aircraft. The joints consisted of Alclad 2024-T3 aluminum sheets adhesively bonded to extruded 6061-T6511 aluminum, and are part of low-load-bearing members required to carry a minimum load of 175 lbs./ft. or 14.58 lbs./in. The Alclad 2024-T3 and 6061-T6511 aluminum were prepared by sanding with 80 grit abrasive paper, the surface was cleaned with acetone to remove surface contaminants, rinsed with distilled water, and dried using paper towels. Once the surface was prepared, the test coupons were assembled using one of the …

Design Of A Children’S Earth Science Exhibit For The Exploration Station In Grover Beach, California With An Emphasis On Fog Collection, Kathryn Thomas

Materials Engineering

An outdoor earth science museum exhibit was designed for the Exploration Station in Grover Beach, California, and will use the harvesting methods of fog as a clean water resource to educate children. The design of the exhibit has two parts: a 1 m x 1 m static Standard Fog collector for long term fog collection which rises 2 m off the ground, and a mobile six-panel display consisting of six different materials and structures of meshes, all of which could potentially be used in a large scale fog collection setting. The six-panel portion will present the children with a hands-on …

Thermally Insulating Coating For Steel Drill Pipe, Matthew Mccaffrey

Materials Engineering

A 5/16 in thick, 6 in x 6 in steel plate was used as a simple analog to 4 inch grade “S” steel drill pipe. Ethylene tetraflouroethylene (ETFE) applied as a powder coating was selected as the desired thermally insulating coating because of its excellent chemical resistance, maximum service temperature of 300°C, its thermal conductivity of 0.238 W/m-K, and for its ability to be applied in thicknesses of up to 80 mils. A powder primer coat of approximately 2 mils was applied using a conventional corona electrostatic powder sprayer, and then the high build topcoat was applied directly over the …

Design And Construction Of A Simulated Evaporative Heat Exchanger For Testing The Mitigation Effects Of Pipe Coatings On Mineral Scale Deposition, Taylor J. Anderson

Materials Engineering

The thermal efficiency of evaporative heat exchangers is diminishing due to mineral scale buildup on heat exchanger surfaces. A simulated evaporative heat exchanger was designed and constructed for testing the mitigation effects of polymer coatings on mineral scale deposition rates. The heat exchanger was designed to cool hot mud at 200°F using a cooling water supply with a calcium concentration of 1000 ppm. The system was constructed using 1.5-inch diameter polypropylene piping, a DIG Corporation drip irrigation system, a TotalPond 530 GPH pond pump, an Omega CSI32K miniature benchtop controller, Omega FWH321-020 high temperature heater tape, and fifteen copper pipe …

Analyzing The Acoustical Properties Of Alternative Materials In Guitar Soundboards To Reduce Deforestation, Chris Dunn

Materials Engineering

To mitigate the effects of deforestation, man-made alternative materials were analyzed and tested for potential use in the soundboards of acoustic guitars. The materials evaluated included 0.06 in. foamed polycarbonate, 0.12 in. single-ply honeycomb fiberglass, and 0.04 in. epoxy fiberglass. The properties of Sitka spruce, the most common tonewood, were used as a benchmark. The Young’s modulus to density ratio found in Sitka spruce is relatively high, making its properties ideal for soundboard applications. Both Young’s modulus and density were necessary to calculate the acoustic constant of each material that was tested. The samples were subject to the impact of …

Interactive Museum Exhibit To Introduce K-6 Grade Students To Circuits And The Electric Conductivity Of Various Materials, Thien Vu-Nguyen

Materials Engineering

The SciTechatorium (SciTech) is a museum filled with interactive exhibits for visitors to learn science informally. A new exhibit was developed to explore electric conductivity and circuits. The design was made based on the size of the material sample the students will use and to allow interactions with multiple users. The materials the students will use were selected using Cambridge Engineering Selector (CES) to sort the materials by resistivity, the inverse of conductivity. After sorting the materials by resistivity, five different materials (balsa wood, polystyrene, polyester, stainless steel, and copper) were chosen for the exhibit. The target size of the …

Development Of A High Precision Quantum Dot Synthysis Method Utilizing A Microfluidic Reactor And In-Line Fluorescence Cell, Harry Lafferty, Jonny Hoadley

Materials Engineering

Quantum dots show great potential for use as spectral converters in solar cells, lighting applications and biological imaging. These applications require precise control of quantum dot size to maximize performance. The fluorescence profile of quantum dots in solution correlates directly with particle size. An alternative, high precision process was developed for the synthesis of cadmium-selenide quantum dots using a microfluidic reactor and fluorescence flow through cell. The process required creating separate cadmium and selenium precursors that were then mixed in a nitrogen environment at 17± 1°C. Using an NE-300^® syringe pump, the solution was pumped through a microfluidic reactor …

Comparison Of Polyurethane And Polysiloxane Coating Systems In Marine Environments, Jake Jarman, Jessica Salvatin

Materials Engineering

This project investigates the performance benefits of polysiloxane and polyurethane coating systems for corrosion protection in marine environments. PPG Industries Amercoat 450H and International Paint Interthane 990HS were the polyurethane topcoats tested. PPG Industries Ameron PSX 700 (New Blend) and International Paint Interfine 878 were the polysiloxane topcoats tested. Each coating was sprayed onto carbon steel panels that were prepared through hand blasting with glass beads. Scribed and unscribed panels were tested in a salt fog chamber for 1,200 hours according to ASTM Standard B0117-11 and in a UV/Humidifier for 1,650 hours according to ASTM Standard D4587-11. Panels were tested …

Effect Of Carbon On Primary Alpha Percentage In Ti-6al-4v As Temperature Approaches The Beta Transus, Kyle Savage

Materials Engineering

Some Ti-6Al-4V forgings require a specific amount of α phase known as primary α in the finished product. The percentage of primary α is dependent on how close to the beta transus temperature forging is conducted. The beta transus temperature is affected by certain alloying elements. Carbon is one of the elements known to increase the beta transus temperature. Since each Ti-6Al-4V ingot contains varying amounts of carbon, testing on a variety of chemistries needs to be conducted. Cubes approximately 0.5 inches from low, medium, and high carbon chemistries were heat treated at temperatures below the beta transus in 18 …

The Optimization And Packaging Of Materials Safari Science Educational Tool For K-4 Grade Levels, Elizabeth Chandy

Materials Engineering

An interactive materials-based learning kit for K-4 grade levels was refined to effectively be used in outreach and after-school programs. Different safari animals made of different materials are packaged in the kit, along with different activities to explore physical properties. An optimized number and variety of animals and materials were determined. The volume and weight of the Materials Safari learning kit was optimized to meet the user’s needs. One way the product was optimized was reducing the number of animal pieces in the product. Also, two of the testing stations were reduced in size by about fifty percent to fit …

Design For The Asce Steel Bridge Competition, James Behel, Silvia Garcia, Reyn Kimura, Scott Nowak

Civil, Environmental and Sustainable Engineering Senior Theses

On April 20, 2013, the Santa Clara University Steel Bridge Team entered in the American Society of Civil Engineers' (ASCE) National Student Steel Bridge Competition. As part of their senior design, the four member team designed and constructed a steel bridge to compete in the annual competition. Engineering senior design projects require thoughtful planning, execution, and documentation throughout the process. The 2013 team approach was to be proactive and aggressive in all aspects of the project. The 2013 Steel Bridge spanned 16.5 ft and had a 3.5 ft cantilever end. The overall dimensions of the bridge for its height and …

Caltrain Bridging Structure And Commercial Buildings, Anthony Navarrete, Guadalupe Gonzalez

Civil, Environmental and Sustainable Engineering Senior Theses

The proposed project involves the design of three tower structures connecting a pedestrian bridge to help provide commuters, bicyclists, and pedestrians access to the east and west sides of the Santa Clara Caltrain rail system. Since the new San Jose Earthquakes stadium is currently being constructed on the east side of the tracks adjacent to Coleman Avenue, high business potential for a possible multi-use retail development exists. In addition to the three towers, three commercial structures will be designed in order to satisfy the need for a retail development. This project will serve as an attraction that will help attract …

Mixed-Use Low-Rise And Parking Structure Design In Downtown San Jose, Satej Desai, Marina Howard, Michaela Nava

Civil, Environmental and Sustainable Engineering Senior Theses

This project focuses on the restoration of an old property in the downtown San Jose area. The specific location was recommended to the project team by their advisors based upon current site development by the general contractor Barry Swenson. After consultations with advisors and this contractor, it was determined that the project team designs two new structures to be placed on site that would help with the rehabilitation: a mixed-use low rise construction with commercial and residential space as well as a precast concrete parking structure. The low-rise building was designed as a hot-rolled steel podium with light framing (cold-formed …

An Approach To Light-Frame Disaster Relief Housing, Hayley Dickson, Megan Cronan, Anne Walkingshaw, Katherine Busch

Civil, Environmental and Sustainable Engineering Senior Theses

An Approach to Light-Frame Disaster Relief Housing investigated the use of bamboo structures to provide safe, affordable and easily constructible housing in developing countries that are prone to natural disasters. The team chose to use the Cagayan Valley Region in Northern Philippines that has a demonstrated need for relief housing due to its susceptibility to high seismic activity, monsoons, and floods. The proposed solution includes a complete structural and geotechnical foundation design of a house that can resist the demand loads determined for the region. The structural system is designed using bamboo and includes a lateral force resisting system, and …

A Mechanism-Based Approach For Predicting Ductile Fracture Of Metallic Alloys, Xiaosheng Gao

Mechanical Engineering Faculty Research

Ductile fracture in metallic alloys often follows a multi-step failure process involving void nucleation, growth and coalescence. Because of the difference in orders of magnitude between the size of the finite element needed to resolve the microscopic details and the size of the engineering structures, homogenized material models, which exhibits strain softening, are often used to simulate the crack propagation process. Various forms of porous plasticity models have been developed for this purpose. Calibration of these models requires the predicted macroscopic stress-strain response and void growth behavior of the representative material volume to match the results obtained from detailed finite …

Tmc Simulator, Stuart Heater

Computer Science and Software Engineering

The goal of this project was to design and implement a graphical user interface which simulates TriTech's VisiCad Inform computer- aided dispatch well enough for trainees to learn how to efficiently and accurately use the software in a risk-free environment. The simulator should also allow the training proctor to actively create new incidents during training in order to ensure that the trainees are able to respond properly. The structure of this project allowed me to work with both more- and less-experienced programmers, particularly those who are far more experienced with networking and hardware than myself. It was my first time …

Insight - A Virtual Reality, Svyatoslav Markeyev, Brian Spence

Computer Engineering

This is a project about extending the capabilities of current consumer virtual reality systems. The goal of the project was to extend the capabilities of the Oculus Rift Headset in order to create a system which would allow a user to explore a virtual environment in an immersive way just as they would explore reality. The system created would allow a user to explore a virtual environment by walking around in a familiar immersive manner. This was accomplished using the Unreal Development Kit, a state of the art GPS system, and industry proven IMU. The user’s movements are tracked as …

0tter - 0g Tracking And Targeting Experiment In Real-Time, Brandon Bussjaeger

Computer Science and Software Engineering

No abstract provided.

Dynamic Paint For Maya: Creation And Use In The Animation Short "Color Clash", Christopher Wallis

Computer Science and Software Engineering

This write-up describes the creation and utilization of a paint effect from both the perspective of the programmer and the animator. The paint effect simulates a 2D fluid using the algorithm described in Jos Stam's ``Real-time Fluid Dynamics for Games'' \cite{stam}, bakes the results into an image sequence, and then wraps the sequence around a 3D mesh. The second half of this paper describes how the effect was integrated into the animation short, ``Color Clash'' and the animation pipeline that was used.

Hid Rw300/Rw400 Hardware Implementation Vulnerabilities And Mitigation Strategies, Taylor Nelson

Computer Science and Software Engineering

The HID RW300/RW400 readers are in use and deployed in buildings around the world. Designed for industrial/commercial facilities security requirements you can find them outside biotech companies (AMGEN), educational institutions (Cal Poly San Luis Obispo), and doctors offices. In a 2010 paper entitled “Heart of Darkness - exploring the uncharted backwaters of HID iCLASSTM security” by Milosch Meriac numerous vulnerabilities were outlined. Despite this research HID continues to sell these readers to consumers.

To properly protect the safety of individuals and assets these HID devices are no longer adequate. I have verified that these attacks are feasible by a moderately …

Ticketcloud, Ross Mckelvie

Computer Science and Software Engineering

TicketCloud is a digital ticket service that offers advantages to both event hosts/vendors and consumers. Using QR Codes, RESTful cloud APIs, and mobile devices TicketCloud takes an outdated market digital and opens up new methods of transacting, allowing customers to resell tickets from their couch and for vendors to reap the benefits of these transactions.

Pavement Quality Indicators, Connor Villanueva, Wayne Jensen

Nebraska Department of Transportation: Research Reports

No abstract provided.