Materials Literature
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This work investigates the torque sensing capabilities for Galfenol. A static test and rotating static test are performed on a single crystal and a rolled polycrystal Galfenol patch. The rotating static test demonstrates Galfenol's noncontact use. Both the static and rotating static tests show a linear response for th…
In this paper, surface cracking and interface reactions of a barium-strontium-aluminosilicate (BSAS) coating and a multi-layer ZrO28wt%Y2O3 and mullite/BSAS/Si thermal and environmental barrier coating system on SiC/SiC ceramic matrix composites were characterized after long-term combined laser thermal gradient and fu…
The high-pressure phase diagram of $\mathrm{Cs}{\mathrm{C}}_{8}$ graphite intercalation compound has been investigated at ambient temperature up to $32\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. Combining x-ray and neutron diffraction and Raman and x-ray absorption spectroscopies, we report that $\mathrm{Cs}{\mathrm{C}}…
Abstract PP/PE 93/7 model virgin blends and recycled scraps were compatibilized with Royalene (EPDM/PE 65/35 blend) and mechanically tested. No differences in impact and tensile properties between them were found. However, the tensile‐impact strength increased almost twice with 10%‐compatibilized sample in comparison…
The " V -shaped switching" mode in high polarization ferroelectric liquid crystals was studied with the aim of stabilizing the monostable bookshelf structure with the spontaneous polarization parallel to the glass plates. The director field in such cells was confirmed to be sensitive to both the liquid crystal propert…
This article aims at investigating in vivo evaluation of lyophilization procedure on the biocompatibility of bovine pericardium treated with glutaraldehyde (GA). The bovine pericardium was fixed with 0.5% glutaraldehyde during 10 days and preserved in 4% formaldehyde (FA). Two groups of samples were prepared from trea…
P-type Sb2−xBixTe3 crystals with various chemical compositions (x = 0.40, 0.44, 0.47, 0.50, 0.53, 0.56 and 0.60) were fabricated by zone melting method. Transmission electron microscopy and energy dispersive X-ray microanalysis were performed to characterize the evolutions of defects on the sites of Bi, Te and Sb atom…
We demonstrate a simple approach to significantly reduce the electrical resistivity of thermo-responsive shape-memory polymers (SMPs), so that they can be easily triggered for shape recovery by Joule heating at a low electrical voltage. After adding a small amount of Ni micro particles into a polyurethane SMP filled w…
Alpha-silicon carbide powder consolidated by both dry and wet methods. Dry pressing in a double-acting steel die yielded sintered test bars with an average flexural strength of 235.6 MPa with a critical Saw size of≈100m̈m. An aqueous slurry pressing technique produced sintered test bars with an average flexural streng…
Researchers at NASA Glenn Research Center have been investigating high temperature shape memory alloys as potential damping materials for turbomachinery rotor blades. Analysis shows that a thin layer of SMA with a loss factor of 0.04 or more would be effective at reducing the resonant response of a titanium alloy beam…
The nonlinear thermomechanical relationship in shape memory polymers (SMPs) has drawn considerable attention in many fields ranging from aeronautics to medicine largely due to their ability to withstand deformations several orders of magnitude larger than in shape memory alloys (SMAs). At high temperatures, SMPs share…
This volume describes in detail the mechanisms of the diisocyanates and polyols polyaddition process as well as its kinetic and process aspects important for obtaining linear polyurethanes. General kinetics of the process and its experimental verification, using GPC chromatography as well as NMR spectroscopy and MALDI…
A model based on dislocation glide controlled by the nucleation and propagation of kink pairs in a high Peierls stress crystal is revisited and modified to account for changes in dislocation densities and segment lengths with temperature and stress. It is applied to the critical‐resolved shear stress (CRSS) for basal…
Within the last decade, the development of compact SMA actuators has led to the design of smart structures such as the Variable Geometry Chevron (VGC), designed by Boeing engineers. The chevrons are aerodynamic devices actuated by SMA beam actuators and placed along the trailing edge of a jet engine to provide noise r…
Decomposition of ferrocene vapor in CO and N 2 atmospheres in the temperature range from 800 to 1150 °C leading to the formation of single-walled carbon nanotubes (CNTs) and maghemite (γ-Fe 2 O 3 ) particles, respectively, was investigated by means of a differential mobility analyzer (DMA) and Fourier transform infrar…
State-of-the-art SiC armor has a fracture toughness of 5.3±0.1 MPa-m1/2, as measured by the single-edge precracked beam (SEPB) technique. It is possible to tailor the hardness and toughness of SiC armor through microstructural control. Hardness generally decreases as toughness increases, in accordance with expectation…
Abstract In this article, different possibilities to enhance the miniaturization of metamaterial resonant particles are presented and discussed. By using two metal layers connected by vias, new compact topologies useful for the synthesis of metamaterials (including left handed structures) are proposed. A comparative a…
We have simulated exchange of inner-sphere and bulk water molecules for different sizes of Al3+(aq) clusters, Al(H2O)63+ + nH2O for n = 0, 1, 6, or 12, with ab initio and molecular dynamics simulations, in order to understand how robust the ab initio method is for identifying hydrolytic reaction pathways of particular…
The most important design criteria for power generators based on Solid Oxide Fuel Cells (SOFC) with regard to the different applications are discussed. The emphasis is put on the requirements of the specific type of application (stationary, transportation, portable) and stack materials and design and the interdependen…
This present paper is focused on the effect of conductive particulate and fibrous fillers on the characterized property of styrene-based shape memory polymer incorporating carbon black (CB) and short carbon fiber (SCF). It was shown that the particulate additives are dispersed homogeneously within matrix and served as…