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Search Publications by: Donald L. Hunston (Assoc)

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Displaying 101 - 125 of 125

A Test Method for Assessing Interfacial Shear Strength in Composites

May 1, 2000
Author(s)
Gale A. Holmes, Donald L. Hunston, Walter G. McDonough, R C. Peterson
Two of the critical factors controlling the long-term performance and durability of composites in structural applications is the fiber-matrix interfacial shear strength (IFSS) and the durability of the fiber-matrix interface. The single fiber fragmentation

Imaging of Composite Defects and Damage Using Optical Coherence Tomography

May 1, 2000
Author(s)
Joy Dunkers, M J. Everett, D P. Sanders, Donald L. Hunston
The Composites Group at the National Institute of Standards and Technology has found optical coherence tomography (OCT) to be a powerful tool for non-destructive characterization of polymer matrix composites. Composites can be made more cost competitive by

Imaging of Impact Damage in Composites Using Optical Coherence Tomography

February 1, 2000
Author(s)
Joy Dunkers, D P. Sanders, Donald L. Hunston, M J. Everett
Resistance to impact damage is extremely important for most composites. Such damage can initiate delamination, one of the most common failure modes in composites.. Because this is such an important failure mode, many studies have tried to develop matrix

Load History Dependence of Fracture in Rubber-Toughened Epoxies

January 1, 2000
Author(s)
Donald L. Hunston, J He, R Raghavan, D Hoffman
It is well know that the most common toughening mechanisms in structural adhesives are viscoelastic processes so the fracture energies for bulk adhesive specimens and bonded joints vary with loading history. The work here examines this effect by measuring

Single Fiber Composites: A New Methodology for Determining Interfacial Shear Strength

January 1, 2000
Author(s)
Gale A. Holmes, Donald L. Hunston, Walter G. McDonough, R C. Peterson
One of the critical factors controlling the long-term performance and durability of composites in structural applications is the interfacial shear strength (IFSS). The single fiber composite (SFC) test has been viewed by many as the best test for

Strain Rate Effects in the Single Fiber Fragmentation Test for Fiber Matrix Adhesion

August 1, 1999
Author(s)
Donald L. Hunston, Gale A. Holmes, R C. Peterson, Walter G. McDonough
In this paper, precise measurements of fiber break regions formed during the single fiber fragmentation testing procedure have been made for E-glass/diglycidyl ether of bisphenol-A (DGEBA)/meta-phenylenediamine (m-PDA) single fiber fragmentation test (SFFT

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

Effects of Environmental Aging on the Properties of Pultruded GFRP

January 1, 1999
Author(s)
Kate Liao, Carl R. Schultesiz, Donald L. Hunston
Pultruded glass-fiber-reinforced vinyl ester matrix composite coupons were subjected to environmental aging in order to study their durability since such composites are of interest for infrastructure applications. Specimens were tested as received and

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

Polymers 1998 Programs and Accomplishments

January 1, 1999
Author(s)
B M. Fanconi, Donald L. Hunston
Technical activities of the Polymers Division, 854, for the 1998 fiscal year are described. Thereport is organized by programs: Electronic Packaging, Interconnection and Assembly; Polymer Blends and Processing; Polymer Composites; Polymer Characterization

Modeling of Multi-Step Nonlinear Stress Relaxation in DGEBA/M-PDA Epoxy Resins

March 4, 1998
Author(s)
Gale A. Holmes, R C. Peterson, Donald L. Hunston
Multi-step stress relaxation data from a DGEBA/m-PDA epoxy resin is modeled using a nonseparable nonlinear constitutive equation. The form of the equation is based on nonlinear concepts and ideas developed in melt rheology. Although time-strain

The Influence of the matrix Modulus on the interfacial Shear Strength Parameter

February 25, 1998
Author(s)
Gale A. Holmes, R C. Peterson, Donald L. Hunston, Walter G. McDonough
In composite structures, adhesion at the fiber-matrix interface is typically determined indirectly from experimental data and theoretical models. These models make varying assumptions about the fiber, matrix, and fragmentation process. Therefore, the

Workshop on Micromechanics Measurement Technologies for Fiber-Polymer Interfaces

May 1, 1997
Author(s)
Walter G. McDonough, Richard~undefined~undefined~undefined~undefined~undefined Parnas, Gale A. Holmes, Donald L. Hunston
The Polymers Division hosted the Workshop on Micromechanics Measurement Technologies for Fiber-Polymer Interfaces, jointly sponsored by NIST and the Textile Research Institute of Princeton, NJ, on May 28-30, 1997. Fifty researchers from industry, academia