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Search Publications by: Walter G. McDonough ()

Displaying 101 - 125 of 186

A Test Method for Determining the Fiber and Void Contents of Carbon/Glass Hybrid Composites

March 1, 2004

Author(s)

Walter G. McDonough, Donald L. Hunston, Joy P. Dunkers, Kathleen M. Flynn

Hybrid composites are increasingly being used in infrastructure, oil recovery, and aerospace applications. These hybrids use two different fibers to reinforce the resin, thereby gaining some of the advantageous properties of both fibers. Typically carbon

Effect of Chemical Structure and Composition of the Resin Phase on Mechanical Strength and Vinyl Conversion of Amorphous Calcium Phosphate-Based Composites

March 1, 2004

Author(s)

Drago Skrtic, Joseph M. Antonucci, Walter G. McDonough, D W. Liu

The mechanical properties of recently developed bioactive, anti-demineralizaing/remineralizing, amorphous calcium phosphate (ACP)-based composites are in need of improvment. The objective of this study was to elucidate the effect of structure and

Interaction Between Matrix Cracks in E-Glass/Epoxy 2 Dimensional Multi-Fiber Array Model Composites

November 15, 2003

Author(s)

Gale A. Holmes, Walter G. McDonough, Joy P. Dunkers, Charles C. Han

The interaction between fiber breaks in an E-Glass/Epoxy 2-D multifiber array that form matrix cracks during fiber fracture is presented. In contrast to the theoretical predictions of Hedgepeth and van Dyke (1967) the failure sites in fibers adjacent to a

Chemistry of Silanes Interfaces in Dental Polymers and Composites

January 1, 2003

Author(s)

Joseph M. Antonucci, Sabine H. Dickens, Bruce O. Fowler, H H. Xu, Walter G. McDonough

The performance and service life of glass- or ceramic-filled polymeric composites depend on the nature of their resin, filler and interfacial phases as well as the efficacy of the polymerization process. The synergy that exists between the organic polymer

Effect of Acidic Comonomers on Methacrylate Conversion and Mechancial Strength of Bioreactive Composites Based on Amorphous Calcium Phosphate

January 1, 2003

Author(s)

Joseph M. Antonucci, Walter G. McDonough, D W. Liu, Drago Skrtic

Effect of Acidic Comonomers on Methacrylate Conversion and Mechanical Strength of Bioactive Composites Based on Amorphous Calcium Phosphate

January 1, 2003

Author(s)

Joseph M. Antonucci, Walter G. McDonough, Da-Wei Liu, Drago Skrtic

Prior research utilizing a monomer system consisting of the dental monomers Bis-GMA and TEGDMA at equal masse levels with neutral, hydrophilic monomers indicated that, generally, the ternary monomer enhanced the degree of methacrylate conversion (DC) but

Glass-Fiber/Resin Interfacial Strength the Microbond Test and Chemical Evaluation

January 1, 2003

Author(s)

Walter G. McDonough, Joseph M. Antonucci, Joy Dunkers, Gary E. Schumacher

The quest for durable, aesthetic and bondable materials that can restore both the function and appearance of lost tooth structure has been a major concern for dental materials researchers. A significant advance, which ushered in the modern era of

Interaction between Matrix Cracks in E-Glass/Epoxy Two-Dimensional Multi-Fiber-Array Model Composites

January 1, 2003

Author(s)

Gale A. Holmes, Walter G. McDonough, Joy Dunkers, Charles C. Han

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

An Analysis of the Fiber-Fiber Interactions Using the Fragmentation Test and Optical Coherence Tomography

October 1, 2002

Author(s)

Walter G. McDonough, Gale A. Holmes, Joy P. Dunkers

Multi-fiber model composites are being used to conduct fundamental studies into the nucleation of failure in fibrous composites. Current results have revealed that the nucleation of critical flaws in unidirectional fibrous composites may rely on the time

Time Dependent Failure in E-Glass/DGEBA/m-PDA Model Composites

September 18, 2002

Author(s)

Gale A. Holmes, Walter G. McDonough

A Microshear Test to Measure Bond Strengths of Dentin-Polymer Interfaces

June 1, 2002

Author(s)

Walter G. McDonough, Joseph M. Antonucci, J He, Y Shimada, Martin Y. Chiang, Gary E. Schumacher, Carl R. Schultesiz

Mechanical property tests such as the diametral tensile, uniaxial tensile and transverse strength tests are commonly used in studying the interfacial properties of the bond between dental composites and dental substrates such as dentin and enamel. These