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Materials

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Displaying 2251 - 2275 of 2347

Application of Self-Assembled Technology to Probe Fiber Matrix-Adhesion

October 1, 2002
Author(s)
E Feresenbet, D T. Raghavan, Gale A. Holmes
Adhesion at the fiber-matrix interface of composite is often related to a combination of factors such as mechanical interlocking, physico-chemical interactions, and chemical bonding of the fiber-matrix interphase region. We demonstrate the use of (self

Application of an On-Line Weld Monitoring System

September 12, 2002
Author(s)
Thomas A. Siewert, Ivan Samardzic, Stefanija Klaric
quisition analysis and real-time manipulation of the welding parameters offer added controls over the weld quality. Thanks to the continual development of information technology and electronics, it is possible to improve the systems for monitoring of the

Acoustic Spectroscopy of Lithium Niobate: Elastic and Piezoelectric Coefficient

September 1, 2002
Author(s)
H Ogi, Y Kawashima, M Hirao, H M. Ledbetter
We report the first Simultaneous measurement of a crystal's complete elastic and piezoelectric coefficients: C if, e ijk. The studied crystal was lithium niobate (LiNbO 3) with trigonal crystal symmetry (3 m point group), thus six independent C ijk, four e

Rheology of Poly(ethylene oxide) Clay Solutions

August 1, 2002
Author(s)
Sheng Lin-Gibson, G Schmidt, Jai A. Pathak, Charles C. Han
Poly(ethylene oxide) and Laponite, a synthetic hectorite clay, form highly viscoelastic solutions in water. Above a certain clay concentration, these solutions can be described as physical crosslinked networks where clay platelets undergo equilibrium

Crystal Structure of Ba 27 Fe 16 Ti 33 O 117

July 1, 2002
Author(s)
T Siegrist, Terrell A. Vanderah, C Svensson, Robert S. Roth
Single-crystal X-ray diffraction studies indicate that the compound Ba 27Fe 16Ti 33O 117- crystallizes in the rhombohedral space group R-3m, with a hexagonal unit cell a=5.7400(8) , c=127.11(3) ; Z=1.5. The arrangement may be described as a 54-layer (54L)

Investigation of Morphology and Interface in Polymer Composite Thin Films

July 1, 2002
Author(s)
C. K. Chiang, Li Piin Sung, R Popielarz
Laser scanning confocal microscopy (LSCM) has been applied to examine the filler particles and their distribution in BaTiO3-polymer composite films. We have measured thin-slice images of the composite films at various depths from the film surface and

Reliability Improvements in Repair Welding of High Strength Steels

July 1, 2002
Author(s)
Ivan Samardzic, Thomas A. Siewert
Engineers often have to deal with repair of weldments after they have been put into service. Here, the concern is that the service environment may have changed the structure, indepent of whether the problems originated during the initial construction (cold

Polymer Composites with High Dielectric Constant

June 1, 2002
Author(s)
C. K. Chiang, R Popielarz
A very high dielectric constant polymer composite film system is presented. The new polymer composite film uses cyanoresin polymer filled with ferroelectric ceramics, such as BaTiO 3 powder. While the dielectric constant of the cyanoresin polymer at 1 kHz

Formation of Solid Electrolyte Interface on Cycled Lithium-Ion Battery Cathodes: Soft X-ray Absorption Study

May 3, 2002
Author(s)
Mahalingam Balasubramanian, James McBreen, Xiao-Qing Yang, H S. Lee, A R. Moodenbaugh, Daniel A. Fischer, Ziwen Fu, D Abraham
Lithium-ion batteries are promising candidates for hybrid electric vehicles (HEV). Batteries that exceed the requirements for HEV, as set by the Partnership for a New Generation of Vehicles (PNGV), have been designed and built. These batteries are based on

Influence of Processing Rate and Formulation on the Interface Strength of Vinyl Ester/E-Glass Composites

April 1, 2002
Author(s)
Walter G. McDonough, Joy Dunkers, Gale A. Holmes, E Feresenbet, Y H. Kim, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The single fiber fragmentation test was used to investigate the effect of gelation time on interfacial shear properties of fast reacting resin systems. We developed a processing system capable of producing single fiber fragmentation samples with gelation

Effective Hamiltonian Study of PZT 95/5

January 21, 2002
Author(s)
K Leung, Eric J. Cockayne, A F. Wright
An effective Hamiltonian is constructed for PbZr0.95Ti0.05O3. It is parameterized using ab initio results computed in the virtual crystal approximation. The phase diagram depends sensitively on the energetic competition between the stable orthorhombic

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
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