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Showing 1 to 20 of 44 for “"sandwich structure"”.
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Buckling and growth of disbonds in honeycomb sandwich structure
The response of honeycomb sandwich structure to disbond damage, in a compressive stress field, has been assessed. Two types of disbond were considered; those extending through the full width of a panel (through-width) and those enclosed within the panel boundaries (embedded). For each type of …
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A self healing smart syntactic foam based grid stiffened sandwich structure
… damage-tolerant material when used in foam-cored sandwich structures. Because of the structural-length scale damages by low velocity impact such as tool drops, runway debris etc., sandwich structures usually have a very low residual structural capacity. Unfortunately, macro-length scale damage, in …
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Durable Sandwich Structure Joining Technology for NASA's Ares V Launch Vehicle
Joining of uniformly-curved composite sandwich panel segments, typical in state of the art aerospace launch vehicles, should be mass-efficient. Adhesively bonded joints can provide increased mass-efficiency over mechanically-fastened joints. But, due to manufacturing sensitivities and certification …
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Fracture properties analysis of rotationally moulded plastics for their application in skin-foam-skin sandwich structure
… products such as skin-foam-skin three layered sandwich structures can be manufactured in a single manufacturing step without any joints. It exhibits relatively high stiffness, strength-to-weight ratios and is used increasingly in various applications such as automotive and marine. During the …
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Energy-absorbing sandwich structures under blast loaDing
… faceplates transferred more energy to a structure under blast loading relative to a structure without an energy absorbing faceplate. The objective of this work is to simulate non-uniform response of sandwich panels subject to blast loaDing This involves an investigation into the optimum …
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Effect of Aerogel on the Thermal Performance of Corrugated Composite Sandwich Structures
… experimental analysis on a corrugated composite sandwich structure integrated with aerogel insulation by studying its effective thermal conductivity. The aerogel material used was Pyrogel XT-E, a silica aerogel-based fiberglass insulation manufactured by Aspen Aerogels. Theoretical models of the …
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Numerical Methods for Predicting the Dynamic Crushing Response and Energy Absorption of Composite Aluminum Honeycomb Sandwich Structures
… responses of composite aluminum honeycomb sandwich structures were predicted using finite element analysis (FEA) software LS-DYNA by modeling the honeycomb as a material with anisotropic properties. The goal of the project was to develop a process for modeling the sandwich structure to …
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Impact Simulation and Analysis of Sandwich Structures
… cause catastrophic results. Several aerospace structures have been used to resist or absorb energy in the occasion of impact. Among these, a sandwich structure has advantages with high stiffness, strength to weight ratio, and its relatively cheap cost. However, finding the impact structural …
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Blast loading of sandwich panels with thin-walled tube cores
An investigation into the response of a novel sandwich panel under blast loading is presented. Thin-walled tubar members have been used extensively as energy absorbers under impact conditions. The progressive folding mechanism induced by axial crushing of the tubes allows for efficient dissipation …
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Fabrication Refinements of Advanced Packaging Techniques for Medium-Voltage Wirebond-less Multi-Chip Power Modules
… This requires refinement to improve the yield of sandwich-structure modules with wirebond-less interconnects. For this module, encapsulated, silver-sintered substrates reduce the peak electric field within the package, improving the partial discharge inception voltage to meet insulation …
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Synthetic Applications of Polar Transition Metal Metallocenes
Since the sandwich structure of ferrocene was elucidated in 1952, metallocenes have generated a vast amount of interest. Transition metal metallocenes have previously been shown to be suitable precursors in the syntheses of novel organometallic and metallo-organic complexes, although the use of …
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Synthesis of CsPbBr3 Quantum Dots for Photodetectors
… Besides, we have fabricated the conventional sandwich structure photodiode by using CsPbBr3 QDs blended with conjugated polymer Poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-co-(bithiophene)] F8T2 as the active layer. The dark current might depend on the weight ratio of F8T2:CsPbBr3 and the …
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Behavior and Flexure Analysis of Balsa Wood Core Sandwich Composites: Experimental, Analytical and Finite Element Approaches
… of a US Army Corps of Engineers available sandwich plates in three-point bending with glass phenolic facings and balsa wood core is being investigated under room and elevated temperatures. Test data on bending rigidity, critical interfacial failure (skin-to-core interface) and shear stress …
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A theoretical study of some transport processes in semiconductors
… are allowed to propagatein a metal-semiconductor sandwich structure and, as anticipated, it is shownthat the familiar parabolic frequency-wave-number relationship breaks up intobands of allowed and forbidden frequency ranges.
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Simultaneous Energy Harvesting and Vibration Control via Piezoelectric Materials
… and vibration control on the same host structure. The motivating application is a multifunctional composite sandwich wing spar for a small Unmanned Aerial Vehicle (UAV) with the goal of providing self-contained gust alleviation. The basic idea is that the wing itself is able to harvest …
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The Modernization of Large Power Transformer Tanks
… behavior against LCS. The results showed that a sandwich structure consisting of cross-ply GFRP and CFRP compares favorably or even be better than LCS in terms of its impact performance if the sandwich is strengthened with an elastomer such as polyurea (PU). To further improve the impact property …
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Lyocell Fiber-Reinforced Cellulose Ester Composites-Manufacturing Considerations and Properties
… Melt processing technique using alternating sandwich structure of fabrics and CAB films produced composites with impressive appearance, low void contents and low moisture absorption. However, SEM results revealed interfacial failure and extensive fiber pull out. Relatively larger fiber and …
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Fabrication and Structural Performance of Random Wetlay Composite Sandwich Panels
… composite panels as the facesheets of honeycomb sandwich structures, it is possible to greatly increase the bending stiffness of the composite without adding significant weight. The random wetlay composite facesheets used in this research consisted of 25% E-glass fibers and 75% PET by weight. The …
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Biofidelic Piezoresistive Sandwich Composites
… to silicone biofidelic materials. A sandwich structure of silicone and CNT sheet, comprising two dielectric facesheets and a highly conductive core layer has added advantages of raising the dielectric permittivity and suppressing dielectric loss.</p> <p>In this thesis, a fabrication …
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Molecular Details Of The Mitochondrial Iron Sulfur Cluster Assembly Pathway
… binds ferrous iron and exists as an alpha-beta sandwich structure. In both, yeast and drosophila, frataxin is able to deliver iron to Isu scaffold (on which transient cluster synthesis takes place) through a metal dependent protein protein interaction. Cluster binding stabilizes the fold of Isu …
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