Materials Literature
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Researchers at the Army Aviation and Missile Research, Development, and Engineering Center (AMRDEC) have initiated multidiscipline efforts to develop nano-based structures and components for insertion into advanced missile, aviation, and autonomous air and ground systems. The objective of the research is to exploit un…
Abstract A new type of unsaturated poly(ester‐amide) viz maleic anhydride‐phthalic anhydride‐ethylene glycol‐neopentylene glycol‐glycin copolymer was prepared by melt polycondensation. The copolymer was characterized by FT‐IR, gel permeation chromatography, and thermal gravimetric analysis. The molecular structure of…
When the number of intensities greatly exceeds the number of unknown atomic coordinates, the problem of obtaining a crystal structure from the intensities is overdetermined and, for a sufficiently small structure, a chemically meaningful solution can be found by direct methods. A difficulty in determining a structure…
In the present work, the influence of multiwalled carbon nanotubes (MWCNTs) on the flame retardancy and rheological, thermal and mechanical properties of polybutilen terephthalate (PBT) and polypropylene (PP) matrixes has been investigated. The carbon nanotube content in the thermoplastic materials was 2 and 5 wt‐%. T…
We investigate the rearrangement of the director in thin films of nematic liquid crystals caused by tightly focusing circularly polarized laser beams. We find either target or spiral patterns, depending on the topology of the director configuration at the position of the beam focus. The induced rearrangements of the d…
This paper describes the robustness of a structural health monitoring system (SHM) that utilizes lead-zirconatetitanate (PZT) transducers tested on carbon fibre composite coupons under drop-weight impact loading. Four PZT transducers are attached to the surface of 10.16 cm x 15.24 cm aerospace grade carbon fibre coupo…
Magnetoelectric materials made from magnetostrictive and piezoelectric constituents are best suited for selfsensing actuators. The relationship between applied magnetic field (force), tip displacement (deflection) and current output (sensing signal) is necessary for the development of self-sensing actuator systems. Th…
SUMMARY Fresh‐cut fruit industry has seen tremendous growth in recent years. The present study was designed with the objective of studying the sensory quality of fresh‐cut apple slices that were treated with different antibrowning agents, packed in three types of packaging materials and subjected to vibration treatmen…
A target's terminal ballistic effects involving explosively generated fragments, along with the original blast, are of critical importance for many different security and safety related applications. Personnel safety and protective building design are but a few of the practical disciplines that can gain from improved…
Abstract This work reports an experimental investigation on sucrose crystal growth. Single crystals in a supersaturated solution were observed under a digital microscope. The changes in crystal lengths along the two dimensions with time were measured and the linear growth rates were determined. Significant growth rate…
Polythermal solubility of individual light fullerenes (C60, C70) and industrial fullerene mixture (65% С60, 39% С70, 1% С76–90) in oleic, linoleic and linolenic acids is investigated. Temperature dependences of solubility are presented and characterized.
Current state-of-the-art commercial sensors and actuators do not meet many of NASA's next generation spacecraft and instrument needs. Nor do they satisfy the DoD needs for satellite missions, especially micro/nano satellite missions. In an effort to develop advanced optical devices and instruments that meet mission re…
We study the behavior of ferroelectric material (BaTiO3) for the design of a nano-generator to convert mechanical into electrical energy. The investigations consider an electro-mechanical phase-field model with polarization as state variable. This widely accepted model has its origins in the work of1-3 and is fully de…
Polymer composites inserted with high volume fraction (up to 70 Vol%) of NiMnGa powders were fabricated and their damping behavior was investigated by dynamic mechanical analysis. It is found that the polymer matrix has little influence on the transformation temperatures of NiMnGa powders. A damping peak appears for N…
The most significant factor, which prescribes the enhancement of properties in rubber by the incorporation of nanoclay, is its distribution in the rubber matrix. The study deals with the utilisation of epoxidised natural rubber (ENR) as a polar compatibiliser to achieve better dispersion of nanoclay in non‐polar polym…
In questo lavoro sono sistematicamente presentate le diverse tecniche utilizzate per neutralizzare gli effettideleteri prodotti dal Fe in leghe Al-Si da fonderia. Partendo dalle tecniche tradizionali di alligazione,vengono prese in considerazione le aggiunte di elementi quali Mn, Co, Be, Cr e K, i quali risultano effi…
Steel corrosion in concrete is a main cause of deterioration and early failure of concrete structures. A novel integration of electromagnetic heat induction and infrared (IR) thermography is proposed for nondestructive detection of steel corrosion in concrete, by taking advantage of the difference in thermal character…
A mean-field model is presented that describes non-uniformities in the spatial distribution of fibres in networks and composites in terms of fluctuations in the local composition. The mean pore radius, specific surface area, lineal path function, and chord length probability density are expressed as functions of the f…
This paper deals with the flap control of unmanned aerial vehicles (UAVs) using shape memory alloy (SMA) actuators in an antagonistic configuration. The use of SMA actuators has the advantage of significant weight and cost reduction over the conventional actuation of the UAV flaps by electric motors or hydraulic actua…
The utilization of shape memory alloys (SMAs) as actuators in aerospace applications continues to show promise. These materials, when subjected to controlled changes in temperature, have the capability to provide motion while under loads that exceed thousands of times their own weight and can do so over tens of thousa…