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Search Publications by: Donald L. Hunston (Assoc)

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Displaying 26 - 50 of 250

Durability of Carbon Nanotube Polymer-Fiber Composites

July 25, 2016
Author(s)
Aaron M. Forster, James Alexander Liddle, Donald L. Hunston, Ajay Krishnamurthy
Significant composite strength improvements have been achieved using highly aligned and dense carbon nanotube fibers with low resin concentration, but these remain ac-cessible only to aerospace applications [1]. The potential of carbon nanotubes for high

ROLE OF SALT ON ADHESION OF AN EPOXY/ALUMINUM (OXIDE) INTERFACE IN AQUEOUS ENVIRONMENTS

November 5, 2015
Author(s)
Kar T. Tan, Christopher C. White, Donald L. Hunston, Justin M. Gorham, Michael Imburgia, Aaron M. Forster, Vogt D. Bryan
Engineering joints consisting of polymer/inorganic interfaces are commonly exposed to less than ideal conditions during normal service; these environmental conditions present a significant challenge for maintaining the structural integrity of the interface

Applied Strain on Sealant Samples Exposed to Outdoor Weather

October 19, 2015
Author(s)
Christopher C. White, Donald L. Hunston, Kar tean Tan
In outdoor exposures used to establish durability of sealant formulations, applied strain is typically absent. It is a critical aspect of the in-service environment. This research employs two recently available techniques to examine how the presence of

Aging of Polymeric Films used in Protective Glazing Systems

July 7, 2015
Author(s)
Christopher C. White, Donald L. Hunston, Kar T. Tan
The toughness of polymer and glass laminates or win-dow glazing, are used to protect buildings and occupants from shattered glass resulting from natural disasters (e.g., hurricanes, tornadoes, seismic events), and intentional events (e.g., robbery

ELEVATED TEMPERATURE ADHESION TESTING OF SPRAY-APPLIED FIRE-RESISTIVE MATERIALS

May 13, 2015
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston, Walter E. Byrd
Effective fire protection of steel can be fully realized when spray-applied fire resistive materials (SFRMs) are bonded sufficiently to structural steel during the event of fire. The adhesion mechanisms and characterization at elevated temperatures

MECHANISMS OF CRITICALITY IN ENVIRONMENTAL ADHESION LOSS

May 13, 2015
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston, Kristen L. Steffens, Deborah S. Jacobs, Bulent Akgun, Vogt D. Bryan
Moisture attack on adhesive joints is a long-standing scientific and engineering problem. A particularly interesting observation is that when the moisture level in certain systems exceeds a critical concentration, the bonded joint shows a dramatic loss of

Prediction of Sealant Modulus Change due to Outdoor Weathering

May 13, 2015
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston, Adam L. Pintar, James J. Filliben
An empirically-based model has been created to predict the change in modulus for a sealant exposed to outdoor weathering. The underlying high precision data supporting this model was obtained using the NIST SPHERE (Simulated Photo degradation by High

IMPACT OF ENVIRONMENTAL FACTORS ON POLYMERIC FILMS USED IN PROTECTIVE GLAZING SYSTEMS

March 11, 2015
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston, Aaron M. Forster, Deborah S. Jacobs
Accelerated and natural aging of safety films used in protective glazing systems was investigated by the use of Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy and tensile tests. Accelerated conditions involved simultaneous

Viscoelastic Characterization of Fusion Processing in Bimodal Polyethylene Blends

June 2, 2014
Author(s)
Aaron M. Forster, Wei-Lun Ho, Kar T. Tan, Donald L. Hunston
Polyethylene is an advantageous material for the construction of buried pipelines. It is corrosion resistant, seismic tolerant, and utilizes low cost installation methods. Pipe sections are often joined using thermal fusion processes. The strength of the

Micro-Deformation in the Fracture of a Toughened Epoxy

February 24, 2014
Author(s)
Donald Hunston, Cyril Clerici, Aurelien Blond, Aaron M. Forster
Thermoset resins are used in many composites and structural adhesives because they have excellent proper-ties. Unfortunately, they tend to be quite brittle. Over the last 50 years, there has been a major effort to improve the toughness of thermosets, and

Structure-Property Relationships in Polyethylene Fusion Bonds

February 24, 2014
Author(s)
Aaron M. Forster, Kar T. Tan, Wei-Lun Ho, Donald L. Hunston
Polyethylene (PE) is used significantly for a wide range of critical fluid transport applications from water to fossil fuels. The advantages of polyethylene are competi-tive cost compared to metallic pipe, lower corrosion rates, and toughness. The key to