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Search Publications by: Donald L. Hunston ()

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Displaying 76 - 100 of 125

Mechanical Behavior of Caulks and Sealants

January 15, 2003
Author(s)
Donald L. Hunston, Christopher C. White
ulks and Sealants are important examples of consumer products where performance depends critically on rheological properties. This work describes the development of a testing and modeling procedure to characterize the basic mechanical properties of such

The Sandwich Bending Specimen for Characterizing Adhesive Properties

January 1, 2003
Author(s)
Donald L. Hunston, Z Z. Miyagi, Carl R. Schultesiz, S Zaghi, H Binson
Techniques to characterize the mechanical properties of adhesives in a bond geometry are important because the behavior can differ from that of bulk adhesive samples. Although there are a number of such tests, the simplicity of the sandwich beam specimen

Application of the V-Notch Shear Testing for Unidirectional Hybrid Composities

December 1, 2002
Author(s)
J He, Martin Y. Chiang, Donald L. Hunston, Charles C. Han
The v-notch (losipescu) shear test was investigated as a mean for determining the in-plane shear modulus and strength of unidirectional hybrid composites. Two types of hybrid systems having different fiber tow volume fractions composed of carbon and glass

Round Robin Assessment of the Single Fiber Fragmentation Test

October 21, 2002
Author(s)
M J. Rich, L T. Drzal, Donald L. Hunston, Gale A. Holmes, Walter G. McDonough
The Versailles Project on Advanced Materials and Standards (VAMAS) was established following an economic summit meeting in 1982 held at Versailles by the Heads of State of the seven leading industrial nations and representatives from the Commission of the

Stiffness and Failure Behavior of Model Hybrid Composites

October 21, 2002
Author(s)
Donald L. Hunston, Walter G. McDonough
Many applications are exploring the use of hybrid composites; i.e., polymers reinforced with two different types of fibers, because such systems can have a superior balance of properties and/or a better balance of properties and cost. Unfortunately, the

Viscoelastic Characterization of Sealant Materials

September 18, 2002
Author(s)
Donald L. Hunston, Christopher C. White
Polymeric sealants are an important example of a major consumer product where the performance depends critically on rheological properties. The work here developed a testing and modeling procedure to characterize the basic mechanical properties of sealant

Comparison of Optical Coherence Tomography, X-Ray Computed Tomography, and Confocal Microscopy Results From an Impact Damaged Epoxy/E-Glass Composite

January 1, 2002
Author(s)
Joy Dunkers, D P. Sanders, Donald L. Hunston, M J. Everett, William H. Green
Optical coherence tomography (OCT) is an emerging technique for imaging of synthetic materials. OCT is attractive because of the combination of its high sensitivity (>90 dB), high resolution ((10-20) mm), and low cost ($75 k). The value of any new

Strain Rate Dependence of Fracture in a Rubber-Toughened Epoxy System

January 1, 2002
Author(s)
D T. Raghavan, J He, Donald L. Hunston, D Hoffman
The toughening mechanisms in rubber-modified epoxies appear to be viscoelastic in nature since the fracture behavior is dependent on loading rate. This behavior has been studied and modeled only for the most common toughened epoxy system. The present work

Analyzing Load History Dependence of Fracture in Structural Adhesives

June 1, 2001
Author(s)
Donald L. Hunston
The most common toughening mechanisms in structural adhesives are viscoelastic processes which means that the fracture enrgies for bulk adhesive specimens and bonded joints will vary with loading history. Although this is well known, relaviely few studies

Continuous Parallel Fiber Composites: Fracture

January 1, 2001
Author(s)
B S. Majumdar, Donald L. Hunston
The objective in this chapter is to briefly review the fracture behavior of unidirectional composites with special attention to mechanisms that have been developed to improve toughness. The focus is on failure involving the propagation of cracks for

The Application of Optical Coherence Tomography to Problems in Polymer Matrix Composites

January 1, 2001
Author(s)
Joy Dunkers, Frederick R. Phelan Jr., D P. Sanders, M J. Everett, William H. Green, Donald L. Hunston, Richard~undefined~undefined~undefined~undefined~undefined Parnas
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 often exhibit superior properties to

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

September 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