Relevant bibliographies by topics / Aramid honeycomb

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Academic literature on the topic 'Aramid honeycomb'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Aramid honeycomb"

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Khakhin, L. A., A. V. Kulik, I. A. Arutyunov, S. N. Potapova, E. V. Korolev, and D. V. Svetikov. "Synthesis and Application of Aramids." Oil and Gas Technologies 129, no. 4 (2020): 3–9. http://dx.doi.org/10.32935/1815-2600-2020-129-4-3-9.

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Presented overview covers existing methods for aromatic heterocyclic polyamides (aramids) production. Aramids application areas are also covered. Aramids are used to produce light, high-strength, heat-resistant, and fire-resistant multifunctional materials. Examples are honeycomb plastics, polymer paper and high-modulus fibers. The latter capable of maintaining high mechanical properties under load at elevated temperatures. In 2018, the global market for aramids was 97,000 tonnes per year. According to the forecast, it will reach 110 thousand tons per year by 2020. Development of production of aramid fibers is important for the global industry.
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Yeo, Eudora Sia Ying, John Wang, Leo Mirabella, and Andrew N. Rider. "Effect of Humidity and Thermal Cycling on Carbon-Epoxy Skin/Aramid Honeycomb Structure." Materials Science Forum 654-656 (June 2010): 2600–2603. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2600.

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Many modern military aircraft are constructed from composite and bonded structure, such as thin carbon-epoxy laminate bonded to Kevlar® and Nomex® honeycomb. Operation of these platforms in Australian and global conditions will subject the structure to potentially high levels of humidity, extremes in temperature, and for maritime operations, exposure to salt spray conditions. The thin composite laminate is likely to rapidly absorb moisture in a humid environment and enable permeation of moisture into the adhesive and core. In addition to the chemical influence of moisture on the composite structure, the moisture trapped in the honeycomb structure may freeze and expand with changes in altitude during operations or simply due to daily temperature fluctuations at the resident airbase. The combination of moisture ingress in the honeycomb structure and thermal cycling may lead to deteriorated strength of the honeycomb panels over time that would not be observed for long term humid exposure alone. Long term salt water absorption may also have an adverse effect on composites structures. This study investigates the effects of humid environments and thermal cycling on the mechanical properties of composite and honeycomb structures.
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Kumar, Ramesh, Lijo James, and Nalla Perumal. "NCCR - Aramid Sandwich Insulator for Cryogenic Applications." International Journal of Computational Physics Series 1, no. 1 (March 5, 2018): 197–203. http://dx.doi.org/10.29167/a1i1p197-203.

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Structural integrity of cryogenic propulsion system in which fuel and oxidizer tanks are connected using truss tubes was well established. The critical issue in the design is the temperature constraint so that temperature is limited to within K for LH2 tank as against K for the LOX. In the present work, based on transient heat transfer analysis for 600s, polyimide foam filled aramid honeycomb core sandwich insulator is designed for common bulkhead instead of truss tubes each for cryogenic and semi cryogenic systems. Non conducting cryo compatible resin (NCCR) is used to bond the skin and core. Comparison of the back wall temperature for different heat flux and different thermal specifications obtained from test and prediction shows a good agreement. The study shows that a small increase in core height of foam filled sandwich insulator considerably controls the temperature increase of LH2. Test data on flat - wise tensile strength at 77K of NCCR resin used in the honeycomb sandwich insulator shows the values in the acceptable range.
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Shan, Junfang, Songlin Xu, Lijiang Zhou, Daorong Wang, Yonggui Liu, Ming Zhang, and Pengfei Wang. "Dynamic fracture of aramid paper honeycomb subjected to impact loading." Composite Structures 223 (September 2019): 110962. http://dx.doi.org/10.1016/j.compstruct.2019.110962.

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Wu, Yi-Jui, James C. Seferis, and Vincent Lorentz. "Evaluations of an aramid fiber in nonwoven processes for honeycomb applications." Journal of Applied Polymer Science 86, no. 5 (August 21, 2002): 1149–56. http://dx.doi.org/10.1002/app.11069.

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Li, X. Y., X. P. Hu, and X. Wu. "Shear Fracture Model of Ultrasonic Cutting for an Aramid Paper Honeycomb." Strength of Materials 51, no. 4 (July 2019): 541–47. http://dx.doi.org/10.1007/s11223-019-00099-0.

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Liu, Longquan, Han Feng, Huaqing Tang, and Zhongwei Guan. "Impact resistance of Nomex honeycomb sandwich structures with thin fibre reinforced polymer facesheets." Journal of Sandwich Structures & Materials 20, no. 5 (August 12, 2016): 531–52. http://dx.doi.org/10.1177/1099636216664076.

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In order to investigate the impact resistance of the Nomex honeycomb sandwich structures skinned with thin fibre reinforced woven fabric composites, both drop-weight experimental work and meso-mechanical finite element modelling were conducted and the corresponding output was compared. Drop-weight impact tests with different impact parameters, including impact energy, impactor mass and facesheets, were carried out on Nomex honeycomb-cored sandwich structures. It was found that the impact resistance and the penetration depth of the Nomex honeycomb sandwich structures were significantly influenced by the impact energy. However, for impact energies that cause full perforation, the impact resistance is characterized with almost the same initial stiffness and peak force. The impactor mass has little influence on the impact response and the perforation force is primarily dependent on the thickness of the facesheet, which generally varies linearly with it. In the numerical simulation, a comprehensive finite element model was developed which considers all the constituent materials of the Nomex honeycomb, i.e. aramid paper, phenolic resin, and the micro-structure of the honeycomb wall. The model was validated against the corresponding experimental results and then further applied to study the effects of various impact angles on the response of the honeycomb. It was found that both the impact resistance and the perforation depth are significantly influenced by the impact angle. The former increases with the obliquity, while the latter decreases with it. The orientation of the Nomex core has little effect on the impact response, while the angle between the impact direction and the fibre direction of the facesheets has a great influence on the impact response.
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Griefahn, D., J. Wollnack, and W. Hintze. "Principal component analysis for fast and automated thermographic inspection of internal structures in sandwich parts." Journal of Sensors and Sensor Systems 3, no. 1 (May 14, 2014): 105–11. http://dx.doi.org/10.5194/jsss-3-105-2014.

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Abstract. Rising demand and increasing cost pressure for lightweight materials – such as sandwich structures – drives the manufacturing industry to improve automation in production and quality inspection. Quality inspection of honeycomb sandwich components with infrared (IR) thermography can be automated using image classification algorithms. This paper shows how principal component analysis (PCA) via singular value decomposition (SVD) is applied to compress data in an IR-video sequence in order to save processing time in the subsequent step of image classification. According to PCA theory, an orthogonal transformation can project data into a lower dimensional subspace with linearly uncorrelated principal components preserving all original information. The effect of data reduction is confirmed with experimental data from IR-video sequences of simple square-pulsed thermal loadings on aramid honeycomb-sandwich components with CFRP/GFRP (carbon-/glass-fiber-reinforced plastic) facings and GFRP inserts. Hence, processing time for image classification can be saved by reducing the dimension of information used by the classification algorithm without losing accuracy.
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Grünewald, Jonas, Tilman Orth, Patricia Parlevliet, and Volker Altstädt. "Modified foam cores for full thermoplastic composite sandwich structures." Journal of Sandwich Structures & Materials 21, no. 3 (June 22, 2017): 1150–66. http://dx.doi.org/10.1177/1099636217708741.

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Full thermoplastic composite sandwich structures with a foam core offer the possibility to be manufactured by fusion bonding in significant shorter cycle times than thermoset-based sandwiches. However, the application of foam cores results in lower mechanical properties such as compression and shear strength compared to honeycomb cores, therefore foam-based sandwiches cannot compete with sandwich structures based on Aramid/phenolic honeycomb cores, the current state of the art. In order to improve the mechanical performance of foam core-based sandwiches while maintaining their advantages, concepts to reinforce the foams were developed in this study. By introducing rods either orthogonally or diagonally to the skin plane, which are fusion bonded to the skins during processing, the compression and shear properties can be improved by up to 1000% and 72%, respectively. Even when correcting for the weight increase, an improved specific compression strength could be achieved. And therefore, the pinning looks especially promising when only applied locally in highly loaded areas for example.
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MINOSHIMA, Kohji, Kazuto TANAKA, Daisuke GOSHIMA, and Kenjiro KOMAI. "Impact and Compression after Impact Fracture Behavior of CFRP/Aramid Honeycomb Core Sandwich Panel." Proceedings of the JSME annual meeting 2000.1 (2000): 569–70. http://dx.doi.org/10.1299/jsmemecjo.2000.1.0_569.

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Dissertations / Theses on the topic "Aramid honeycomb"

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Rupčík, Jan. "Deformační člen formulového vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231790.

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The diploma thesis deals with Formula Student Impact Attenuator design of TU Brno Racing team. The aim of the thesis is the design, the dynamic tests and the production of Impact Attenuator of racing formulas called Dragon 4 and Dragon 5, so to meet the Formula Student rules. The thesis deals further with FEM dynamic analysis of Impact Attenuator.
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GUO, JIN-MING, and 郭進明. "The effect of curing cycle on the mechanical properties of graphite/expoxy-aramid honeycomb Sandwich construction." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/12267424857666877303.

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Bugiel, Alexander. "Ein Beitrag zur mechanischen Charakterisierung und numerischen Simulation von Aramid-Papier für Luftfahrtanwendungen." 2019. https://tud.qucosa.de/id/qucosa%3A74255.

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In Luftfahrzeugen werden häufig Sandwich-Strukturen verwendet, da somit vergleichsweise hohe gewichtsspezifische Steifigkeiten und Festigkeiten erreicht werden können. Hierbei werden für Deckschichten überwiegend Faserverbund-Kunststoffe angewendet. Die Kerne bestehen zumeist aus Honigwaben, welche aus phenolharzbeschichtetem Aramid-Papier gefertigt sind. Somit können Anforderungen an die Feuer- und Korrosionsresistenz erfüllt werden. Sandwich-Strukturen im Allgemeinen sind dabei anfällig für lokale Belastungen, sowie Lasten senkrecht zur Struktur. Dies können beispielsweise Schlagbelastungen, Lasteinleitungen durch Verbindungselemente oder Druckunterschiede sein. Folglich bedarf die Zertifizierung von Luftfahrtstrukturen zumeist umfangreiche experimentelle Untersuchungen zum Nachweis des Tragverhaltens und der Schadenstoleranz. Dieses Vorgehen ist äußerst zeitaufwendig und somit kostenintensiv. Virtuelle Tests, welche durch einzelne reale Versuche validiert werden, können den experimentellen Aufwand erheblich reduzieren. Dazu bedarf es fundierter Kenntnisse der mechanischen Eigenschaften der einzelnen Komponenten der Sandwich-Struktur. Während diese für Faserverbund-Kunststoffe als gegeben angenommen werden kann, trifft dies für Honigwabenkerne bestehend aus Aramid-Papier nicht zu. Demzufolge wird in dieser Arbeit ein Vorgehen vorgestellt, welches eine mechanische Charakterisierung und numerische Simulation von papierartigen Materialien ermöglicht. Dabei werden zunächst anwendbare Prüfmethoden für Aramid-Papier evaluiert. Darauf aufbauend werden ein verbessertes Schubprüfverfahren und ein neuartiges Druckprüfverfahren für Papier erarbeitet. Anschließend werden verschiedene luftfahrttaugliche Papiere mechanisch charakterisiert und Anforderungen an ein Materialmodell für die numerische Simulation abgeleitet. Daran anknüpfend wird ein spezielles Materialmodell entwickelt, welches das elastisch-plastische orthotrope Materialverhalten mit unterschiedlicher Druckplastifizierung und regressivem Versagen abbilden kann. Dieses Modell wird in LS-DYNA implementiert und validiert. Darauf aufbauend werden Validierungsrechnungen am Aramid-Papier sowie an Honigwaben- und Faltkern-Strukturen durchgeführt. Abschließende exemplarische Simulationen von Deckschichtablöseversuchen demonstrieren die mit dem Vorgehen erreichbare Qualität der Ergebnisse sowie Möglichkeiten zum virtuellen Testen und virtuelle Parameterstudien.
A variety of components in aircraft are made out of sandwich structures because of its high weight-specific stiffness and strength. In many cases, fiber composite plastics are used for face-layers and cores consist of honeycombs, which are made of phenolic resin coated aramid paper. Thus, requirements for fire and corrosion resistance can be met. Sandwich structures in general are prone to local loads as well as loads perpendicular to the structure. This can be, for example, impact loads, load applications by connecting elements or pressure differences. Consequently, certification of aerospace structures usually requires extensive experimental tests to demonstrate structural behavior and damage tolerance. This procedure is extremely time-consuming and therefore cost-intensive. Virtual tests, which are validated by individual experiments, can significantly reduce the experimental effort. This requires a knowledge of the mechanical properties of the individual components of the sandwich structure. While this is given for fiber composite plastics, this is not true for honeycomb cores consisting of aramid paper. Consequently, this work presents a procedure that allows mechanical characterization and numerical simulation of paper-like materials. First, applicable test methods for aramid paper are evaluated. Based on this, an improved shear test method and a novel compression test method for paper are developed. Subsequently, various paper-like materials are mechanically characterized. The requirements for a material model for numerical simulation are derived. Following on from this, a special material model is developed that can reproduce the elastic-plastic, orthotropic material behavior with different plastification for compressive loads and a regressive failure model. This material model is implemented and validated in LS-DYNA. Based on this, validation calculations are carried out on aramid paper, honeycomb and foldcore structures. Final exemplary simulations of single-cantilever-beam tests demonstrate the achievable quality of the results as well as possibilities for virtual testing and virtual parameter studies.
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Conference papers on the topic "Aramid honeycomb"

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Squibb, Carson O., and Michael K. Philen. "Characterization of Honeycomb Polymer Composites for Use in Adaptable Aerospace Structures." In ASME 2017 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/smasis2017-3824.

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Smart materials are unique in their ability to change properties in response to an environmental stimulus. These materials provide promising opportunities for adaptable aerospace structures, where they can be altered to suit their need. In this research, Honeycomb Polymer Composites (HPCs) were investigated as potential materials for this need. HPCs are new materials that consist of a polymer embedded in a honeycomb structure, and exhibit a significantly higher stiffness than the polymer or honeycomb alone. This stiffness amplification is due to the nearly incompressible polymer resisting the volume change within the honeycomb cells. HPC samples were fabricated using an aramid honeycomb, with either silicone or urethane rubber as the matrix materials to fill the honeycomb. Varying polymer stiffness, honeycomb geometry, and testing temperature were all tested to observe the effects on the material properties. The results indicated that the HPCs could be effectively tailored and modeled to suit the need for different effective moduli. This research provides important insight and results in the development of programmable honeycomb polymer composites (PHPCs), which rely on shape memory polymers (SMP) as the internal working polymer.
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Gill, David D., Derek M. Yip-Hoi, Max Meaker, Taryn Boni, Erica L. Eggeman, Alex M. Brennan, and Aidan Anderson. "Studying the Mechanisms of High Rates of Tool Wear in the Machining of Aramid Honeycomb Composites." In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-2694.

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Aramid honeycomb composite structures have revolutionized the aerospace industry by providing high strength, light weight, energy absorbing structures for many applications. To finder wider utilization, the costs of producing honeycomb structures must be reduced and one important area of focus is to reduce tool wear and increase tool life. This study began with the hypothesis that the high rate of tool wear was due to excessive tool rubbing because of the lower stiffness of this material when compared to solid materials. Tool wear measurements were taken over the life of a tool and high speed video was utilized to study the machining process. The results of the tool wear test showed a standard tool wear timeline. The video analyses showed the tool experiencing rubbing far beyond expectations due to the collapse of honeycomb cells induced by twisting far in advance of the arrival of the tool.
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Hanan, Jay C., Balaji Jayakumar, and Advait Bhat. "Mechanical Properties of Amorphous Metal Honeycombs for Ballistic Applications." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11413.

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Body armor technology continually improves in performance and endurance with the introduction of new designs and materials. Composite layered armor systems comprised of ceramics and fabric based materials are at the leading edge. Over the years, these systems have seen preference over their metal counterparts due to reduced weight. High performance polyethylene (Spectra, Dyneema), Aramids (Kevlar, Twaron, Zylon) and other composite materials, [1] have further improved dynamic resistance in body armor with reasonable strength-to-weight ratio.
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Pedro Augusto Silva de Sousa Sousa, Denilson Pablo Cruz de Oliveira Oliveira, Rafael Jarbas Barradas do Nascimento Nascimento, João Lucas Jacob Araujo Araujo, Ana Claudia Galvão Xavier Xavier, and Anderson Felipe Chaves Fortes Fortes. "ANÁLISE DO COMPORTAMENTO MECÂNICO EM FLEXÃO DE PAINÉIS SANDUÍCHES COMPÓSITOS COM MATERIAL DE NÚCLEO TIPO HONEYCOMB EM FIBRA DE ARAMIDA." In IX Congresso Nacional de Engenharia Mecânica. Rio de Janeiro, Brazil: ABCM Associação Brasileira de Engenharia e Ciências Mecânicas, 2016. http://dx.doi.org/10.20906/cps/con-2016-1388.

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