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Displaying 401 - 425 of 486

AN ANALYSIS PROCEDURE FOR QUANTIFYING THE FRAGMENTATION BEHAVIOR OF 2-D MULTI-FIBER ARRAYS

May 24, 2007

Author(s)

Jae Hyun Kim, Walter G. McDonough, Gale A. Holmes

Prediction of Elastic Properties of Heterogeneous Materials With Complex Microstructures

January 1, 2007

Author(s)

Yong Ni, Martin Chiang

A homogenization method combining the Eshelby equivalent eigenstrain approach and the phase-field microelasticity for numerically solving the eigenstrain, is developed to predict all the effective elastic constants of three-dimensional heterogeneous

Measuring the Mechanical Properties of Nanocomposites: Potential Complications From the Mullins Effect

September 20, 2006

Author(s)

Christopher C. White, Donald L. Hunston

Quantification of mechanical properties, such as non-linear viscoelastic behavior, for filled elastomers (model nanocomposites) is complicated by the presence of the Mullins effect. This paper examines the potential complications due to the Mullins effect

Feasibility on Using a Concrete Mixing Truck as a Rheometer

June 14, 2006

Author(s)

S Amziane, Chiara C. Ferraris, E Koehler

Fresh concrete properties are crucial for the performance of the concrete in its hardened state. The measurement of workability is usually done using a simple slump test. This test, although widely used for almost 100 years, does not provide a full picture

Polymerization Shrinkage And Stress Development In Bioactive Urethane Acrylic Resin Composites

January 1, 2006

Author(s)

Joseph M. Antonucci, Tonya Icenogle, W F. Regnault, D W. Liu, J N. O'Donnell, Drago Skrtic

Moisture Diffusion and Temperature History Models for Thin Organic Coatings Exposed to Ambient Air

September 20, 2005

Author(s)

William C. Thomas, Christopher C. White, Mark R. VanLandingham

Baseline models are developed for predicting moisture concentration and temperature in extremely thin polymeric films bonded to impermeable substrate materials. These simplified models are based on analytical rather than numerical solutions to circumvent

Viscoelastic Characterization of Polymers Using Instrumented Indentation I. Quasi-static Testing

July 13, 2005

Author(s)

Mark R. VanLandingham, N-K Chang, P L. Drzal, Christopher C. White, S-H Chang

The use of instrumented indentation to characterize the mechanical response of polymeric materials was studied. A model based on contact between a rigid probe and a linear viscoelastic material was used to calculate values for creep compliance and stress

Viscoelastic Characterization of Polymers Using Instrumented Indentation II. Dynamic Testing

July 13, 2005

Author(s)

Christopher C. White, Mark R. VanLandingham, P L. Drzal, N-K Chang, S-H Chang

Dynamic nanoindentation was preformed on a cured epoxy, poly(methyl methacrylate), and poly(dimethyl siloxane) or PDMS. These samples, two glassy polymers and a rubbery material are used to illustrate the agreement between classical rheological

Influence of Experimental Set-Up and Plastic Deformation on the Shaft-Loaded Blister Test

May 11, 2005

Author(s)

S Goldfarb, E P. O'Brien, Christopher C. White

The effect of film thickness, substrate hole diameter, and shaft tip diameter on the applied strain energy release rate, G, of a thin film was measured using the shaft-loaded blister test. Test specimens consisted of plies of Kapton pressure sensitive

Assessment of the Role of Filler Size in Amorphous Calcium Phosphate Filled Methacrylate Dental Composites (Poster)

April 1, 2005

Author(s)

Joseph M. Antonucci, Drago Skrtic

The goal of this study was to assess the effects of the ACP s filler particle size on the physicochemical and mechanical properties of EBPADMA-based composites. The experimental resin was formulated from the commercially available monomers: EBPADMA, tri

Prediction and Three-Dimensional Monte-Carlo Simulation for Tensile Properties of Unidirectional Hybrid Composites

April 1, 2005

Author(s)

Martin Y. Chiang, Xianfeng Wang, Carl R. Schultesiz

A three-dimensional fiber tow-based analytical model incorporating shear-lag theory and a statistical strength distribution has been used to simulate the tensile properties and predict the tensile strength of unidirectional hybrid composites. The hybrid

Design, Development and Testing of a Hybrid Device for In-Situ Testing of Sealant

January 19, 2005

Author(s)

Christopher C. White, E Embree, C Buch

A new hybrid in-situ sealant-testing device that uses movement to both characterize and fatigue standard ASTM C719 sealant samples is described. This five sample device, records the force-response data for every deformation cycle of every sample. From this

Matrix Resin Effects on Selected Physicochemical Properties of Amorphous Calcium Phosphate Composites

January 1, 2005

Author(s)

Joseph M. Antonucci, Drago Skrtic

Unusual Multilayered Structures in PEO/Laponite Nanocomposite Films

November 19, 2004

Author(s)

Avinash Dundigalla, Sheng Lin-Gibson, F Ferreiro, M M. Malwitz

The unusual structure of poly-ethylene-oxide and Laponite clay in transparentnanocomposite films was investigated using scanning electron, atomic force, optical microscopy, and X-ray scattering. Each method is sensitive to different aspects of structural

Shear-Induced Structure in Polymer-Clay Nanocomposite Solutions

June 1, 2004

Author(s)

Sheng Lin-Gibson, H W. Kim, G Schmidt, Charles C. Han, Erik K. Hobbie

Abstract: The equilibrium structure and shear response of model polymer-clay nanocomposite gels are measured using X-ray scattering, light scattering, optical microscopy, and rheometry. The suspensions form physical gels via the bridging of neighboring

Studies on the Effect of Movement During the Cure on the Mechanical Properties of Sealand

February 8, 2004

Author(s)

Christopher C. White, Donald L. Hunston, R S. Williams

A novel sealant-testing device was used to con-tinuously monitor the mechanical properties of a one part silicone sealant for movement cycles initiated from 10 h to 168 h after sample creation. These cure times fall between the proposed RILEM TC-139

Monte-Carlo Simulation for the Fracture Process And Energy Release Rate of Unidirectional Carbon Fiber-Reinforced Polymers at Different Temperatures

January 1, 2004

Author(s)

X Wang, Martin Chiang, Chad R. Snyder

Orientation of Platelets in Multilayered Nanocomposite Polymer Films

December 1, 2003

Author(s)

M M. Malwitz, Sheng Lin-Gibson, Erik K. Hobbie, Paul Butler, G Schmidt

The orientation of platelets in micron thick polymer-clay nanocomposite films was investigated by means of small-angle neutron scattering (SANS), small angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD). The films with various clay

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

Reliability-Based Method for Service Life Prediction of Materials

September 17, 2003

Author(s)

Christopher C. White, Jonathan W. Martin, S F. Weber, L Shultz

Standard test methods, such as ASTM C719, evaluate sealant performance though threshold test measurements. This method and its derivatives do not offer reliable predictions of in-service performance. This presentation will detail efforts to move away from

The Influence of Silane Coupling Agent Composition on the Surface Characterization of Fiber and on Fiber-Matrix Interfacial Shear Strength

July 1, 2003

Author(s)

E Feresenbet, Gale A. Holmes, D T. Raghavan

Epoxy resins are widely used as the matrix material for fiber reinforced composites in aircrafts, automobiles, ships and housing. Most of the reinforcement in epoxy composite is glass fiber so as to lower the cost. Studies in the past have suggested that

Using Self-Assembled Monolayer Technology to Probe the Mechanical Response of the Fiber Interphase-Matrix Interphase Interface

June 1, 2003

Author(s)

Gale A. Holmes, E Feresenbet, D T. Raghavan

In this paper, a brief review of the fiber-matrix interphase/interface region is given for carbon- and glass-fiber composites. The interphase/interface region is discussed interms of the fiber interphase (FI), the matrix (MI), and the FI-MI interface as

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

Application of the V-Notch Shear Test as Applied to Unidirectional Hybrid Composites

January 1, 2003

Author(s)

H Jianmei, Martin Chiang, Donald L. Hunston

The modified Wyoming test fixture (ASTM D5379-93) with doubly v-notched specimens 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

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

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