Materials Literature
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In this study, magnetostrictive sensor (MsS) technology was used to detect cracks and predict crack length in double lap joint specimens representative of aircraft substructure. It was shown that the MsS system was successful in detecting crack growth, and could predict the second-layer crack length to within 10% of t…
The effects of vapor-grown carbon nanofiber (VGCNF) weight fraction, applied stress, and temperature on the viscoelastic response (creep compliance) of VGCNF/vinyl ester (VE) nanocomposites were studied using a central composite design (CCD). The nanocomposite test articles were fabricated by high shear mixing, castin…
This paper is directed towards understanding damage progression and failure in advanced nanostructured composite materials. The molecular dynamics method is a subset of computational chemistry codes which creates system trajectories consistent with thermodynamic ensembles. The molecular dynamics program LAMMPS, (Large…
One method for Nondestructive Evaluation (NDE) of Carbon Fiber Reinforced Polymers (CFRP) is the integration of magnetostrictive particles (MSP) into CFRP laminates. In order to ensure that integration of MSP would be a feasible method of nondestructive evaluation, the structural intrusiveness of the particles must be…
was published. For last two decades, the advances of nanotechnology has improved the mechanical properties [2] and the thermal properties [3], which are useful in thermal management for electric devices at small length scale, which require prompt removal of heat from the system. Superior thermal conductivities are rep…
In this study, a low viscosity, high performance cyanate ester (CE) resin system was used with non-functionalized and functionalized multiwall carbon nanotubes (MWNTs) to create cyanate ester-MWNT nanocomposites. Effects of three different standard functionalizations (i.e. ‐OH, -COOH, and -NH 2 ) of MWNTs on their dis…
We developed micro-structured thin films with ultra-low coefficient of thermal expansion. These low-weight, flexible, thermally stable films are expected to be a useful tool in aerospace applications, for example, as a reflective layers of deformable space telescope mirrors. The low-CTE films are composed of a Ti fram…
Quasiparticle recombination in a superconductor with an $s$-wave gap is typically dominated by a phonon bottleneck effect. We have studied how a magnetic field changes this recombination process in metallic thin-film superconductors, finding that the quasiparticle recombination process is significantly slowed as the f…
The paper presents the development of a simplified structural model for the prediction of the elastic properties of textile composite materials. The model is based on an analytical 3D Mosaic structure, implemented in Matlab. It analyzes a representative unit, considering meso-volumes and periodic boundary conditions,…
Metal-ceramic composites combining Shape Memory Alloys (SMAs) with MAX phase ceramics are gaining interest due to their unique combination of inelastic constituents. Specifically, these composites, intended for extreme environments, are being explored to take advantage of the reversible martensitic transformation asso…
As a kind of electroactive soft polymer which contains molecular chains cross-linking to each other to form a 3D network, the dielectric elastomers have extraordinary attractive advantages such as large deformation, high responsive speed, high efficiency, and high elastic energy density. This paper investigated the st…
Goal of present study is to investigate effects of carboxyl-functionalized multi-walled carbon nanotubes on the low velocity impact behavior of carbon fiber reinforced polymer composites. Up to 0.3 wt% loading of MWCNTs were dispersed via a combined method of sonication and magnetic stirring using a solvent media in e…
Polycrystalline tungsten is considered as an important material in aerospace, automobile, and energy industries due to its excellent thermal and mechanical properties. While grain boundaries (GBs) are perceived to play a major role in polycrystalline tungsten failure resistance, experimental data is scarce on explicit…
In particle-strengthened metallic alloys, fatigue damage incubates at inclusion particles near the surface or at the change of geometries. Micromechanical simulation of inclusions such that the fatigue damage incubation mechanisms can be categorized. As micro-plasticity gradient field around different inclusions is di…
The addition of particulate additives has long been used as a method to adjust and design material systems for specific loading conditions. The transfer of loading to particulate additives can result in added toughness and can change ductility, among other properties. These changes are a function of many factors inclu…
The compatibility of aluminum and aluminum alloys with synthetic fuel blends comprised of ethanol and reference fuel C (a 50/50 mix of toluene and iso-octane) was examined as a function of water content and temperature. Commercially pure wrought aluminum and several cast aluminum alloys were observed to be similarly s…
The widespread use of nanomaterials demonstrates a tremendous benefit to society; however, as nanomaterials are inevitably introduced to the environment, it is unknown how their compositions and coating agents alter in different settings and over a prolonged period of time. Coating agents are applied either during or…
We experimentally demonstrate synthesis and in-situ analysis of multimode plasmonic excitations in two-wire transmission lines supporting a symmetric and an antisymmetric eigenmode. To this end we irradiate an incoupling antenna with a diffraction-limited excitation spot exploiting a polarization- and position-depende…
A cerâmica vermelha e um importante insumo da construcao civil. O setor produtivo estende-se principalmente nas regioes sul e sudeste do pais devido a abundância de materia-prima e de mercado consumidor. O objetivo deste trabalho e encontrar a incidencia e cada material na mistura, neste caso contendo somente tres dif…
This report summarizes the activities undertaken by EWI while under contract from the Department of Energy (DOE) Office of Nuclear Energy (NE) for the management and operation of the Nuclear Fabrication Consortium (NFC). The NFC was established by EWI to independently develop, evaluate, and deploy fabrication approach…