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Elevated temperature and stress ratio effects on the fatigue crack growth of aramid reinforced aluminum laminates
Title
Elevated temperature and stress ratio effects on the fatigue crack growth of aramid reinforced aluminum laminates.
Creator
Gardini, Christopher Alan., Florida Atlantic University, Salivar, Gary C.
Abstract/Description
This investigation concentrated on the fatigue crack growth properties of ARALL laminates. The influence of stress ratio and elevated temperature on fatigue crack growth rates were addressed. It was found that elevated temperature had an effect on the delamination of the fiber/resin lamina from the aluminum sheets resulting in a change in crack growth rate behavior. A stress ratio effect was also present at elevated temperature that could not be explained completely by crack closure concepts.
Date Issued
1990
PURL
http://purl.flvc.org/fcla/dt/14666
Subject Headings
Aluminum alloys--Fatigue, Aluminum alloys--Cracking, Aluminum alloys--Testing, Laminated metals--Fatigue
Format
Document (PDF)
Mechanistic study of chromate adhesion enhancement on aluminum 2024-T3 alloy
Title
Mechanistic study of chromate adhesion enhancement on aluminum 2024-T3 alloy.
Creator
Simmons, Ronald M., Florida Atlantic University, Granata, Richard D., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
This research investigates the influence of chromate, as a conversion coating and as an inhibitor pigment, on the adhesion of epoxy coatings to an aluminum substrate. Epoxy coatings, with and without strontium chromate (SrCrO4) inhibitor pigment, are prepared according to manufacturers' specifications on AA2024-T3 substrates, with and without chromate conversion coatings. Specimens are exposed in an environmental chamber, cycling between high and low humidity conditions. After exposure,...
Show moreThis research investigates the influence of chromate, as a conversion coating and as an inhibitor pigment, on the adhesion of epoxy coatings to an aluminum substrate. Epoxy coatings, with and without strontium chromate (SrCrO4) inhibitor pigment, are prepared according to manufacturers' specifications on AA2024-T3 substrates, with and without chromate conversion coatings. Specimens are exposed in an environmental chamber, cycling between high and low humidity conditions. After exposure, specimens are evaluated using Electrochemical Impedance Spectroscopy (EIS), ASTM D3359 cross-cut tape test, and an Environmental Scanning Electron Microscope. From the evaluation it was determined that under these exposure conditions chromate does not increase the adhesive strength between the aluminum substrate and the epoxy coating system, but does provide corrosion inhibition. Regardless of the pretreatment or the coating system, the coating fails at the interface between the substrate and the coating.
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Date Issued
2001
PURL
http://purl.flvc.org/fcla/dt/12860
Subject Headings
Chromium compounds, Aluminum alloys, Impedance spectroscopy
Format
Document (PDF)
Composition of aluminum phenylphosphonate solutions: Evidence from nuclear magnetic resonance
Title
Composition of aluminum phenylphosphonate solutions: Evidence from nuclear magnetic resonance.
Creator
Schulz, Hans-Erich., Florida Atlantic University, Haky, Jerome E.
Abstract/Description
27Al nuclear magnetic resonance (NMR) has been employed to study the structure of aqueous aluminum nitrate solutions in the presence of phenylphosphonic acid, potassium dihydrogen phosphate and phosphoric acid. Evidence has been obtained which indicates that in aqueous solution, aluminum ions can be complexed with phosphonate or phosphate in either a 1:1 or 2:1 molar ratio, respectively. The relative percentages of these complexes in solution are shown to be dependent on the ratio of aluminum...
Show more27Al nuclear magnetic resonance (NMR) has been employed to study the structure of aqueous aluminum nitrate solutions in the presence of phenylphosphonic acid, potassium dihydrogen phosphate and phosphoric acid. Evidence has been obtained which indicates that in aqueous solution, aluminum ions can be complexed with phosphonate or phosphate in either a 1:1 or 2:1 molar ratio, respectively. The relative percentages of these complexes in solution are shown to be dependent on the ratio of aluminum nitrate to phosphonate or phosphate as well as the degree of ionization of the phosphorus species.
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Date Issued
1995
PURL
http://purl.flvc.org/fcla/dt/15232
Subject Headings
Nuclear magnetic resonance, Aluminum alloys--Bonding
Format
Document (PDF)
Combined influence of heat treatment and immersion corrosion on the tensile-shear strength of aluminum-steel explosively welded plates
Title
Combined influence of heat treatment and immersion corrosion on the tensile-shear strength of aluminum-steel explosively welded plates.
Creator
Oberle, Hugues., Florida Atlantic University, McIntyre, Jack F., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
A series of experiments were performed on aluminum-steel explosively welded joints. The pub of this research was to better understand the synergism, if any, between thermal heat treatments and exposure to a seawater environment on the tensile-shear strength of the explosively welded joint. The effect of three different heat treatments on the tensile-shear strength of the bond was examined. The combined effect of two heat treatments and immersion in flowing aerated, natural seawater has been...
Show moreA series of experiments were performed on aluminum-steel explosively welded joints. The pub of this research was to better understand the synergism, if any, between thermal heat treatments and exposure to a seawater environment on the tensile-shear strength of the explosively welded joint. The effect of three different heat treatments on the tensile-shear strength of the bond was examined. The combined effect of two heat treatments and immersion in flowing aerated, natural seawater has been studied for two different corrosion times. For comparison purposes, some samples were also immersed in stagnant, aerated 3.5% weight NaCl solution. Open circuit potential measurements and microhardness profiles were also made. It was found that a heat treatment that would anneal the aluminum without causing the formation of an intermetallic layer at the aluminum steel explosively welded interface, was the best compromise between reduced mechanical properties and improved corrosion resistance.
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Date Issued
1991
PURL
http://purl.flvc.org/fcla/dt/14768
Subject Headings
Steel-aluminum alloys, Thermal stresses, Welded joints--Testing
Format
Document (PDF)
Para-aminophenyl alumina: A new stationary phase for high-performance liquid chromatography
Title
Para-aminophenyl alumina: A new stationary phase for high-performance liquid chromatography.
Creator
Calixte, Mincs-Elie., Florida Atlantic University, Haky, Jerome E.
Abstract/Description
Surface-modified alumina containing covalently-bonded p-aminophenyl groups was prepared by refluxing chromatographic grade alumina with p-aminophenylphosphonic acid in n-butanol. The resulting material, p-aminophenylalumina (PAPA), was evaluated for use as a stationary phase in high performance liquid chromatography (HPLC). When used with mobile phases consisting of acetonitrile and water, retention of solutes on the PAPA phase exhibited normal phase behavior, as evidenced by the increases in...
Show moreSurface-modified alumina containing covalently-bonded p-aminophenyl groups was prepared by refluxing chromatographic grade alumina with p-aminophenylphosphonic acid in n-butanol. The resulting material, p-aminophenylalumina (PAPA), was evaluated for use as a stationary phase in high performance liquid chromatography (HPLC). When used with mobile phases consisting of acetonitrile and water, retention of solutes on the PAPA phase exhibited normal phase behavior, as evidenced by the increases in solute retention times with increasing percentages of acetonitrile. Excellent separations of carbohydrate mixtures were obtained on the PAPA stationary phase. Comparisons of the chromatographic properties the PAPA phase with those of commercial aminoalkyl silica stationary phases were also performed.
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Date Issued
1998
PURL
http://purl.flvc.org/fcla/dt/15570
Subject Headings
Stationary phase (Chromatography), Liquid chromatography, Aluminum alloys--Bonding
Format
Document (PDF)
Some calculated properties of beta prime-nickel aluminum
Title
Some calculated properties of beta prime-nickel aluminum.
Creator
Hines, Eric Lawrence, Florida Atlantic University, Jordan, Robin G.
Abstract/Description
The band structure, density of states, Fermi surface, bulk modulus and heat of formation were calculated for beta prime-NiAl using the SCF-LMTO-ASA method. The equilibrium lattice constant was also determined by minimizing the total energy. The angle-resolved and x-ray photocurrents from the valence bands were determined using the NEWPOOL and XPSI codes and the calculated spectra were compared with recent experimental measurements. In the former case, the calculations were carried out for the...
Show moreThe band structure, density of states, Fermi surface, bulk modulus and heat of formation were calculated for beta prime-NiAl using the SCF-LMTO-ASA method. The equilibrium lattice constant was also determined by minimizing the total energy. The angle-resolved and x-ray photocurrents from the valence bands were determined using the NEWPOOL and XPSI codes and the calculated spectra were compared with recent experimental measurements. In the former case, the calculations were carried out for the (001) surface using s-polarized light and included the experimentally observed relaxations of the top two layers with an Al termination. The overall agreement between the theoretical and experimental spectra is good, indicating that self-energy effects are not large.
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Date Issued
1992
PURL
http://purl.flvc.org/fcla/dt/14804
Subject Headings
Electronic structure, Solids--Data processing, Nickel-aluminum alloys
Format
Document (PDF)