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Full-Text Articles in Engineering

Precipitation Studies Of Pb In Single Crystal Pbte, Walter Ludwig Erhard Jan 1969

Precipitation Studies Of Pb In Single Crystal Pbte, Walter Ludwig Erhard

Theses and Dissertations

A study of the kinetics of precipitation of excess Pb in PbTe was made by the use of Hall measurements. The objective was to find how excess Pb precipitated.


The Effect Of Carbide-Forming Elements On The Structure And Mechanical Properties Produced Produced By Cyclic Transformation, Charles Arthur Apple Jan 1969

The Effect Of Carbide-Forming Elements On The Structure And Mechanical Properties Produced Produced By Cyclic Transformation, Charles Arthur Apple

Theses and Dissertations

Cyclic martensitic transformation was performed on two Fe-Ni-.3C base alloys containing the carbide-forming elements Cr or V and on a plain Fe-Ni-.3C alloy. Martensite was formed by cooling in liquid nitrogen and austenite was produced by heating in molten salt or lead to reversal temperatures selected to be approximately 10 C above the appropriate temperature determined by quantitative X-ray measurements of martensite.


The Fatigue Behavior Of Sintered Iron Powder Compacts, Richard S. Bankowski Jan 1969

The Fatigue Behavior Of Sintered Iron Powder Compacts, Richard S. Bankowski

Theses and Dissertations

Stress-endurance curves were determined and the fatigue limits were defined as a function of sintered density for reverse-bend stressing of sintered iron specimens.


A Dynamic Programming Simulation Of The Electroslag Remelting Process, Ronald C. Gover Jan 1969

A Dynamic Programming Simulation Of The Electroslag Remelting Process, Ronald C. Gover

Theses and Dissertations

A statistical study was made of the changes occurring in slag composition and remelted ingot composition during the electroslag remelting of five heats of three different grades of stainless steel. It was found that changes in flux chemistry were numerous and accurate prediction of flux composition was possible from the calcium fluoride content alone.


A Study Of The Stress Corrosion Cracking Of 7075 T6 Aluminum Alloy Using Fracture Mechanics Concepts, Andrew Paul Popichak Jan 1969

A Study Of The Stress Corrosion Cracking Of 7075 T6 Aluminum Alloy Using Fracture Mechanics Concepts, Andrew Paul Popichak

Theses and Dissertations

This investigation was undertaken to characterize the dependency of stress corrosion cracking of aluminum alloy 7075 - T6 in aqueous 3 1/2% NaC1 solution. As part of the investigation, the growth of stress corrosion cracks in plane strain, short transverse orientation specimens was monitored optically.


Void Behavior As Influenced By Deformation And Pressure, Kurt J. Kahlow Jan 1969

Void Behavior As Influenced By Deformation And Pressure, Kurt J. Kahlow

Theses and Dissertations

Void formation, growth, and coalescence have a pronounced effect on the properties of most materials. Void behavior is strongly influenced by the type of deformation process and the magnitude of hydrostatic pressure.


The Bending Of Polymer Material Under Tension As Related To A Deep Drawing Process, William B. Buettner Jan 1969

The Bending Of Polymer Material Under Tension As Related To A Deep Drawing Process, William B. Buettner

Theses and Dissertations

Two engineering plastics, an acrylonitrile-butadiene-styrene resin and a rigid polyvinyl chloride resin were investigated to determine the effects of cold working. Bending under tension stress sytem of a deep drawing process was considered.


The Adhesion Of Gold To Aluminum Oxide, James L. Brandner Jan 1969

The Adhesion Of Gold To Aluminum Oxide, James L. Brandner

Theses and Dissertations

The adhesion of gold to sapphire has been investigated in an effort to develop a bonding model for Au/A12o3 system. Ultra-pure gold was bonded to sapphire by melting it on sapphire disks in a furnace with a controlled atmosphere.


Correlation Between Surface Condition And Mechanical Strength Of High Alumina Ceramic Substrates, Raymond F. Gruszka Jan 1969

Correlation Between Surface Condition And Mechanical Strength Of High Alumina Ceramic Substrates, Raymond F. Gruszka

Theses and Dissertations

The surfaces of a fine grained, high alumina ceramic substrate material were modified by various treatments in order to determine the effect of surface character on fracture strength. The resulting surfaces were characterized by profilometer measurements and electron microscopy. Fracture strengths were determined by transverse bend tests using four point loading.


A Study Of Parameters Affecting Ultrasonic Welding, Walter K. Johnston Jan 1969

A Study Of Parameters Affecting Ultrasonic Welding, Walter K. Johnston

Theses and Dissertations

A bond is created by vibrations, in the case of ultrasonic welding, which induce relative motion between two weldment members held together by an external clamping force. The relative motion and the clamping force combine to create shear strains in the interface which mechanically break-up the oxide thus providing clean surfaces by exposing fresh metal.


The Effects Of Changes In Au Concentration Upon The Microstructure And Magnetic Properties Of Au-Fe-Co Alloys, Larry Lynch Jan 1969

The Effects Of Changes In Au Concentration Upon The Microstructure And Magnetic Properties Of Au-Fe-Co Alloys, Larry Lynch

Theses and Dissertations

Au-Fe-Co alloys with a constant Co-Fe ration of 7, and Au contents ranging from 0.5% to 18% were cast, solution annealed, and cold-rolled into thin strips. Light and electron metallographic techniques and electron microprobe analysis established that alloys cold-worked 75 and 90% exhibited simultaneous recrystallization and Au precipitation on heating. Direct current magnetic measurements showed that coercive force increased with Au additions up to 14% and decreased thereafter.


Effect Of Tempering On The Anodic Polarization Behavior Of An 11 Cr-12 Ni Martensitic Stainless Steel, Kenneth G. Moerschel Jan 1969

Effect Of Tempering On The Anodic Polarization Behavior Of An 11 Cr-12 Ni Martensitic Stainless Steel, Kenneth G. Moerschel

Theses and Dissertations

Anodic polarization measurements in 1.ON H2SO4 and in 1.ON H2SO4 + .1M NaC1 were made on an 11 Cr - 12 Ni martensitic stainless steel in the as-rolled, as-quenched and quenched and tempered conditions. Structural changes on tempering between 100C and 600C were evaluated by hardness measurements, light metallography and transmission electron microscopy.


An Investigation Of The Effect Of Metastable Phases Of Alumina On The Thermal Conductivity Of Plasma Sprayed Alumina Coatings, Theodore W. Robbins Jan 1969

An Investigation Of The Effect Of Metastable Phases Of Alumina On The Thermal Conductivity Of Plasma Sprayed Alumina Coatings, Theodore W. Robbins

Theses and Dissertations

The effect of five plasma spraying variables on the apparent porosity and volume percent metastable phase of alumina coatings was studied. The five variables were; arc gas flow rate, power input, powder size, powder feed rate, and substrate temperature.


The Effects Of Deformation Under Hydrostatic Pressure Upon The Mechanical Properties Of E C Aluminum, Glenn L. Schmehl Jan 1969

The Effects Of Deformation Under Hydrostatic Pressure Upon The Mechanical Properties Of E C Aluminum, Glenn L. Schmehl

Theses and Dissertations

EC aluminum was deformed to various degrees of pre-strain in biaxial compression under several hydrostatic pressures. Teh resulting density, tensile properties, elongation, grain structure, and micro-hardness were measured as a function of the amount of pre-strain.


Characterization Of A Photosensitive Tin(Ii) Compound, Paul J. Sewall Jan 1969

Characterization Of A Photosensitive Tin(Ii) Compound, Paul J. Sewall

Theses and Dissertations

A process for the selective deposition of metals on substrates was recently developed. The process utilizes an invisible film of a photosensitive tin compound which is deposited on a substrate by immersing it in an acid solution of stannous chloride and then rinsing it in deionized water. This study was undertaken to characterize the unknown photosensitive compound and to investigate the effects of the surrounding atmosphere on the phototchemical reaction rate.


The Influence Of Warm Prestressing On The Strength, Ductility, And Toughness Of Pressure Vessel Steels, Lawrence N. Succop Jan 1969

The Influence Of Warm Prestressing On The Strength, Ductility, And Toughness Of Pressure Vessel Steels, Lawrence N. Succop

Theses and Dissertations

The positive beneficial effects of warm prestressing have been demonstrated in a number of lavoratory tests and in principle, should have considerable value in enhancing the fracture capability of pressure vessels. However, there is some indication that the beneficial effects may be lost once actual vessel operational conditions, such as with prolonged thermal exposure. This embrittlement may be enough to trigger a catastrophic failure in the pressure vessels. An investigation was launched to study the effects of strain aging embrittlement, arising from overstressing techniques, on two pressure vessel steels, A533B and A516 grade 70.


Corrosion Rate Determination Of Steel Discs (Electrodes) Pretreated With Monomers, Polymer Solution, Joseph Otsieku Bryden Jan 1969

Corrosion Rate Determination Of Steel Discs (Electrodes) Pretreated With Monomers, Polymer Solution, Joseph Otsieku Bryden

Theses and Dissertations

No abstract provided.


An Improved Electromechanical Electron Trajectory Tracing System, Jean Paul Dethomas Jan 1969

An Improved Electromechanical Electron Trajectory Tracing System, Jean Paul Dethomas

Theses and Dissertations

An analog system is described for automatically plotting of the trajectories of free electrons in a bidimensional electrostatic field using the conductive sheet model.


Plastic Design In A572 (Grade 65) Steel Mechanical Properties Of Astm A572 Grade 65 Steel, Suresh Desai Jan 1969

Plastic Design In A572 (Grade 65) Steel Mechanical Properties Of Astm A572 Grade 65 Steel, Suresh Desai

Theses and Dissertations

This report constitutes the most complete study to date of the properties of higher grade of steel. The strain-hardening range of the material is studied closely and more refined techniques for the evaluation of the strain-hardening modulus are developed.


An Investigation Of The Use Of A Modified Triple Carbonate Cathode Coating In The Manufacture Of High Frequency Carrier Electron Tubes, Russell William Eckert Jan 1969

An Investigation Of The Use Of A Modified Triple Carbonate Cathode Coating In The Manufacture Of High Frequency Carrier Electron Tubes, Russell William Eckert

Theses and Dissertations

Because the high frequency Carrier Electron Tubes were exhibiting several characteristics that were detrimental to tube manufacture such as low test yields, below nominal test parameters and difficulty of activating and aging, it was proposed to evaluate the use of a modified triple carbonate cathode coating with a reduced percentage of calcium carbonate in place of the double carbonate cathode coating that contains no calcium carbonate as the emission material.


The Fatigue Strength Of Welded Partial Length Coverplated Beams, Karl Heinz Frank Jan 1969

The Fatigue Strength Of Welded Partial Length Coverplated Beams, Karl Heinz Frank

Theses and Dissertations

This thesis presents the results and analysis of an experimental investigation to determine the significant parameters influencing the fatigue life of beams with welded partial length coverplates.


A One-Year Study Of The Concrete Strains In Pre-Tensioned Members, Donald C. Frederickson Jan 1969

A One-Year Study Of The Concrete Strains In Pre-Tensioned Members, Donald C. Frederickson

Theses and Dissertations

This report presents the results of a 1 year study of creep and shrinkage behavior of pre-tensioned concrete specimens. Strain measurements from these specimens indicate that creep strain is proportional to the stress-strength ratio, while the shrinkage strain is strongly affected by the percentage of steel in a member.


A Theoretical Investigation Of The Propagation Of Lse-Modes In Rectangular Waveguides Loaded With Dielectric Of Finite Conductivity, Hans Ruediger Gnerlich Jan 1969

A Theoretical Investigation Of The Propagation Of Lse-Modes In Rectangular Waveguides Loaded With Dielectric Of Finite Conductivity, Hans Ruediger Gnerlich

Theses and Dissertations

The propagation in rectangular waveguides containing slabs having finite condustivity is investigated theoretically. The waveguide is assumed to be lossless and of infintie length. the slabs are parallel to the narrow walls and extend over their full height and length. They have arbitrary thickness, dielectric constant and conductivity.


An Experimental Investigation Of A Water Heat Pipe, Nathan Kalowski Jan 1969

An Experimental Investigation Of A Water Heat Pipe, Nathan Kalowski

Theses and Dissertations

A stainless steel water heat pipe instrumented with external surface thermocouples, internal thermocouples and pressure gages was designed, built, and operated. The operating condition of the heat pipe was controlled by manipulation of a resistance heater in the evaporator section an anannulus type water cooling jacket in the condenser section.


A Study Of Simulated Boiling In Vertical Upward And Downward Flow, Chandrakant V. Mahale Jan 1969

A Study Of Simulated Boiling In Vertical Upward And Downward Flow, Chandrakant V. Mahale

Theses and Dissertations

An investigation of the distribution of air and water in the upflow tube, U-bend and downflow tube of a two phase flow apparatus is presented here with the help of experimental results and photographs. Isokinetic and sampling probes were used to sample the flow. Probing was done at the centres and at the beginning of the upflow and downflow tubes.


A Systematic Approach To The Design Of Effective Chip Breakers, Joseph Frank Peritore Jan 1969

A Systematic Approach To The Design Of Effective Chip Breakers, Joseph Frank Peritore

Theses and Dissertations

An investigation into chip breaker designs which will result in the proper chip control is presented in this thesis. The investigation of the premise that chip breakers placed roughly normal to the direction of chip flow would have the greatest likelihood of breaking the chip, was simplified by the use of chip flow angle equations. After the accuracy of these equations was verified, it was possible to construct the chip breaker face at a ninety degree angle to the chip flow direction.


Mechanization Of Context Information For Image Interpretation, Kenneth George Salter Jan 1969

Mechanization Of Context Information For Image Interpretation, Kenneth George Salter

Theses and Dissertations

This is a theoretical and experimental study of ways to use context for automatic interpretation of aerial photography. One type of photo interpretation system interprets a frame of aerial photography by dividing the frame into several square cells and classifying each cell. A parameter extraction device scans each cell, makes measurements, and classifies each cell according to statistical decision theory.


Decimal To Binary Number Conversion, Henrik Arthur Schutz Jan 1969

Decimal To Binary Number Conversion, Henrik Arthur Schutz

Theses and Dissertations

Most programming languages in current use include procedures for converting decimal numbers to a binary form used for computation. Due to the change in radix, the value of the converted result is, in general, an approximation to the value of its decimal representation. The procedures discussed here are of the minimum-error type, and are used in a compiler environment.


Spread In Flat Rolling, Richard D. Way Jan 1969

Spread In Flat Rolling, Richard D. Way

Theses and Dissertations

A velocity field was derived for a flat workpiece undergoing plastic deformation between cylindrical rolls in a rolling mill. Using the velocity field, an expression was written for the total power input required for the rolling process in terms of the process parameters: roll diameter, thickness reduction, workpiece geometry, surface friction, and spread. The Upper Bound Theorem was applied to the power expression to establish an upper limit on it. This limit was minimized with respect to spread to determine the value of spread requiring the least amount of input power.


Determination Of Radiation View Factors In A Cement Kiln Using Numerical Integration, Jerry Lee Wagner Jan 1969

Determination Of Radiation View Factors In A Cement Kiln Using Numerical Integration, Jerry Lee Wagner

Theses and Dissertations

Radiation is the major mode of heat transfer to the charge in a cement kiln. Four types of radiation are present: 1- surface to surface, 2- surface to gas, 3- gas to surface, and 4- gas to gas. As such four corresponding view factors must be determined. One can determine these view factors if the gas space in the enclosure and the boundary walls are divided into zones.