U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Joy Dunkers (Fed)

Search Title, Abstract, Conference, Citation, Keyword or Author
Displaying 176 - 197 of 197

Immobilizing a Fluorescent Dye Offers Potential to Investigate the Glass/Resin Interface

January 1, 2000
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, J H. VanZanten, Joy Dunkers, C G. Zimba, C A. James, S K. Pollack, Richard~undefined~undefined~undefined~undefined~undefined Parnas
Silane coupling agents are commonly applied to glass fibers to promote fiber/resin adhesion and enhance durability in composite parts. In this study, a coupling agent layer on glass was doped with trace levels of the dimethylaminonitrostilbene (DMANS)

The Effect of Processing on Interfacial Shear Properties of Composite Materials

January 1, 2000
Author(s)
Walter G. McDonough, Joy P. Dunkers, Gale A. Holmes, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The objective of our research was to extend the use of the single fiber fragmentation test to include fast reacting resin systems and to determine the effect of gelation time on interfacial shear properties. To do this work, we developed a processing

Numerical Prediction of Permeability Using a Lattice Boltzmann Method and Optical Coherence Tomography

September 23, 1999
Author(s)
Frederick R. Phelan Jr., Joy Dunkers, C G. Zimba, Kathleen M. Flynn, Richard~undefined~undefined~undefined~undefined~undefined Parnas, R C. Peterson, X Li, J G. Fujimoto
A rapid, non-destructive technique called optical coherence tomography (OCT) is used to image the microstructure of an epoxy/e-glass composite. The raw OCT data is processed and converted to a binary image, and then input into a lattice Boltzmann

A Fiber Optic Sensor for Composite Cure Monitoring

March 1, 1999
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, J H. Van Zanten, Joy Dunkers, C G. Zimba, C A. James, S K. Pollack, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The fiber/resin interface is critical to the final mechanical properties of a composite part. The extent f cure and cross-link density affect the resin structure in this interfacial region. In addition, the type of coupling agent coating the fiber, the

Characterization of Composite Microstructure and Damage Using Optical Coherence Tomography

January 1, 1999
Author(s)
Joy Dunkers, C G. Zimba, Kathleen M. Flynn, Donald L. Hunston, R Prasankumar, X Li, J G. Fujimoto
Optical coherence tomography (OCT) is a non-destructive and non-contact technique that images microstructure within scattering media. In this work, the versatility of OCT for non-destructive evaluation is demonstrated through imaging of composite

Microstructural Characterization for Polymer Composites

January 1, 1999
Author(s)
Richard~undefined~undefined~undefined~undefined~undefined Parnas, Donald L. Hunston, Joy Dunkers, Gale A. Holmes
Characterization of composite microstructure is a crucial area since such features plays a major role in processability, performance, damage tolerance, and service life. Moreover, as the reinforcement geometries available are becoming more complex, the

Optical Coherence Tomography of Glass Reinforced Polymer Composites

January 1, 1999
Author(s)
Joy Dunkers, Richard~undefined~undefined~undefined~undefined~undefined Parnas, C G. Zimba, R C. Peterson, Kathleen M. Flynn, J G. Fujimoto, B E. Bouma
Optical coherence tomography (OCT) is a non-destructive and non-contact technique to image microstructure within scattering media. The application of OCT to highly scattering materials such as polymer composites is especially challenging. In this work, OCT

Monitoring Composites with Optical Fiber Sensor Systems

April 26, 1998
Author(s)
Richard~undefined~undefined~undefined~undefined~undefined Parnas, Joy Dunkers, R A. Neff
An inexpensive optical fiber has been interfaced with high-speed fluorescence and near infrared spectrometers to provide real-time monitoring of fast-reacting systems. Cure monitoring measurements were conducted in high volume fraction, glass reinforced

Evaluation of Dental Adhesion and Durability by Means of the Microbond Test

February 25, 1998
Author(s)
Joseph M. Antonucci, Walter G. McDonough, Joy P. Dunkers
The phenomenon of interfacial of interphase adhesion is a critical factor in determining the strength and durability of multiphase dental materials. For example, the clinical performance of acrylic polymer based dental composites depends to a large extent
Was this page helpful?