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Relevant bibliographies by topics / Syntacic foams

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Academic literature on the topic 'Syntacic foams'

Author: Grafiati

Published: 25 May 2024

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Journal articles on the topic "Syntacic foams"

1

Zakaria, Z., and C. Y. Yao. "Compressive Stress of Syntactic Foam: Effect of rNBR Particles Reinforced Epoxy Macrospheres (rNBR-EM)." Solid State Phenomena 280 (August 2018): 301–7. http://dx.doi.org/10.4028/www.scientific.net/ssp.280.301.

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This research focuses on the effect of rejected nitrile butadiene rubber (rNBR) gloves particles reinforced epoxy macrospheres (EM) on the physical properties and compressive stress of syntactic foam. Adding rNBR particles on the surface of macrospheres can increase the energy absorption as a result of improving the compressive properties of syntactic foam. Three types of macrospheres have been produced for the fabrication of syntactic foam, namely EM without rNBR, 1-layer rNBR-EM and 2-layer rNBR-EM. The results showed that increased rNBR particles layer on macrospheres has increased the wall thickness, and reduced the radius ratio of macrospheres as well as increased the density of syntactic foams. The compressive strength and modulus of syntactic foam with 2-rNBR-EM increased compared to the syntactic foams of 1-rNBR-EM and EM without rNBR. In addition, the toughness of the 2-rNBR-EM increased compared to the syntactic foams of 1-rNBR-EM and EM without rNBR.

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Thalmaier, György, Niculina Argentina Sechel, Alexandra Csapai, Catalin Ovidiu Popa, Gabriel Batin, Andras Gábora, Tamas Mankovits, and Ioan Vida-Simiti. "Aluminum Perlite Syntactic Foams." Materials 15, no. 15 (August 8, 2022): 5446. http://dx.doi.org/10.3390/ma15155446.

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This paper presents the usage of spark plasma sintering (SPS) as a method to obtain aluminum-expanded perlite syntactic foams with high porosity. In the test samples, fine aluminum powder with flaky shape particles was used as matrix material and natural, inorganic, granular, expanded perlite was used as a space holder to ensure high porosity (35–57%) and uniform structure. SPS was used to consolidate the specimens. The structures were characterized by scanning electron microscopy and compression tests. Energy absorption (W~7.49 MJ/m3) and energy absorption efficiency (EW < 90%) were also determined.

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Li, Changyun, Erkuo Yang, Ling Tang, Yang Li, and Lei Xu. "Compression Properties and Fabrication of Closed-Cell Metal Matrix Syntactic Foams Al2O3hs/AZ91D." Materials 15, no. 19 (October 3, 2022): 6873. http://dx.doi.org/10.3390/ma15196873.

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Closed-cell metal syntactic foam is a new material consisting of hollow spheres embedded in metal matrix syntactic foams. These foams have good physical and mechanical properties and are increasingly used worldwide in industrial and high-tech fields. Magnesium matrix syntactic foams containing hollow Al2O3 spheres ((Al2O3hs)/AZ91D) were successfully fabricated by hot press sintering at different temperatures. The fabrication of Al2O3hs/AZ91D and the effect of sintering temperature on the microstructure and properties are reported in this paper. Additionally, sandwiched magnesium matrix syntactic foams were prepared by placing magnesium plates on both sides of the syntactic foam. Some Al2O3hs particles became filled with matrix particles during preparation. Thus, the actual density was greater than the theoretically calculated value and increases with increasing sintering temperature. Above 723 K, a brittle phase MgAl2O4 formed in Al2O3hs/AZ91D. The quasistatic and dynamic compressive strengths of Al2O3hs/AZ91D first increased and then decreased with increasing sintering temperature, and the maximums were 162 MPa and 167.87 MPa, respectively. Thus, this paper reports a new strategy for the controlled preparation of metal matrix syntactic foams with predetermined porosity. The results show that this strategy improved the performance of lightweight and high-strength syntactic foam materials and shows potential for further research.

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Movahedi, Nima, Graeme Murch, Irina Belova, and Thomas Fiedler. "Effect of Heat Treatment on the Compressive Behavior of Zinc Alloy ZA27 Syntactic Foam." Materials 12, no. 5 (March 7, 2019): 792. http://dx.doi.org/10.3390/ma12050792.

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Zinc alloy (ZA27) syntactic foams (SF) were manufactured using expanded perlite (EP) particles and counter-gravity infiltration casting. Due to a variation of the metallic matrix content, the density of the produced foam samples varied from 1.78 to 2.03 g·cm−3. As-cast and solution heat-treated samples were tested to investigate the compressive properties of the ZA27 syntactic foam. To this end, quasi-static compression tests were conducted. In addition, microstructural analysis of the as-cast and heat-treated syntactic foams was carried out using scanning electron microscopy. The results indicate that the heat treatment alters the microstructure of the ZA27 alloy matrix from a multiphase dendrite to a spheroidized microstructure with improved ductility. Moreover, the heat treatment considerably enhances the energy absorption and plateau stress ( σ pl ) of the syntactic foam. Optical analysis of the syntactic foams under compression shows that the dominant deformation mechanism of the as-cast foams is brittle fracture. In comparison, the heat-treated samples undergo a more ductile deformation.

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Chen, Zhuo, Zhi Xiong Huang, Yan Qin, Min Xian Shi, Qi Lin Mei, and Ming Zhang. "Effect of Glass Microballoons Size on Compressive Strength of Syntactic Foams." Advanced Materials Research 321 (August 2011): 7–10. http://dx.doi.org/10.4028/www.scientific.net/amr.321.7.

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In this work, syntactic foams made of microballoons having same wall thickness ratio but with different particle size was prepared. Microballoons of three size distribution ranges were selected .The property of the syntactic foams were studied by quasi-static compression test. The experimental results show the microballoons size doesn’t influent the mechanical properties of the syntactic foam significantly. The failure mode of the syntactic foams was also studied in this work.

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Gomez, Sofia Gabriela, Andrea Irigoyen, Stephanie Gonzalez, Kevin Estala-Rodriguez, Evgeny Shafirovich, Md Sahid Hassan, Saqlain Zaman, and Yirong Lin. "Fabrication and Characterization of Hollow Polysiloxane Microsphere Polymer Matrix Composites with Improved Energy Absorption." Journal of Composites Science 7, no. 3 (March 4, 2023): 98. http://dx.doi.org/10.3390/jcs7030098.

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Hollow polymer microspheres with superior elastic properties, high thermal stability, and energy absorbance capabilities are essential in many applications where shock and vibration need to be mitigated, such as in civil, medical, and defense industries. In this paper, the synthesis, fabrication, and characterization of hollow thermoset microspheres for syntactic polymer foam were studied. The hollow polymer microspheres (HPMs) were made by developing core–shell composites and thermally removing the polystyrene core to yield a polysiloxane shell. The HPMs were embedded into a polydimethylsiloxane (PDMS) matrix to form a polymer syntactic foam. The mechanical energy absorption characteristic of polymer syntactic foams was measured by cyclic uniaxial compression testing following ASTM 575. The engineered compression response was demonstrated by fabricating and testing syntactic foams with different porosities, ranging from a 50 vol% to 70 vol% of HPMs. Through scanning electron microscopy (SEM), we observed that the HPM contributes to the energy absorption of the syntactic foam. Moreover, Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) determined the necessity of a profound study to understand the effects of varying HPM synthesis parameters, as well as the syntactic foam fabrication methods. It was shown that the compressive modulus and toughness can be increased by 20% using a 70 vol% of porosity with synthesized HPM syntactic foams over bulk PDMS. We also found that the energy absorbed increased by 540% when using a 50 vol% of porosity with fabricated HPM-PDMS syntactic foams.

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Kozma, I., I. Zsoldos, G. Dorogi, and S. Papp. "Application of Computed Tomography in Structure Analyses of Metal Matrix Syntactic Foams." International Journal of Computer Theory and Engineering 7, no. 5 (October 2015): 379–82. http://dx.doi.org/10.7763/ijcte.2015.v7.989.

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Jin, Xin, He Yi Ge, Ping Wang, Zhong Yuan Pan, and Juan Chen. "Preparation and Characteristic of Different Hollow Microspheres Filled Syntactic Foams." Materials Science Forum 809-810 (December 2014): 237–42. http://dx.doi.org/10.4028/www.scientific.net/msf.809-810.237.

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In this study, hollow glass microspheres (HGM) and hollow polystyrene microspheres (HPSM) have been employed as fillers in epoxy resin to prepare the syntactic foam. A kind of good performance composite was prepared. The effects of presence of various hollow microspheres on the impact and compressive properties of syntactic foams are studied. Weight fraction of HPSM and HGM for the syntactic foams varies up to 2.0 wt% and 25 wt%, respectively. The results show that the coupling agent can induce the interfacial adhesion between the HGM and the resin and help HGM uniformly disperse in the resin and hence result in better mechanical properties of composite. On the other hand, the effect of HPSM for the composite density is greater than that of HGM. The addition of a small percentage of HPSM helps produce an important improvement in the low density of syntactic foam. The syntactic foam has uniform stability component and the excellent integrative performances. Fabricated syntactic foams had compression strength of 51.96 MPa and density of 0.671 g/cm3.

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Schott, N. R., and T. K. Bhattacharjee. "New Syntactic Foams with Polystyrene." Journal of Cellular Plastics 29, no. 6 (November 1993): 556–68. http://dx.doi.org/10.1177/0021955x9302900604.

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Couteau, Olivier, and David C. Dunand. "Creep of aluminum syntactic foams." Materials Science and Engineering: A 488, no. 1-2 (August 2008): 573–79. http://dx.doi.org/10.1016/j.msea.2008.01.022.

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Dissertations / Theses on the topic "Syntacic foams"

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Rothstein, Susan Deborah. "The syntactic forms of predication." Bloomington, IN : Indiana University Linguistics Club, 1985. http://books.google.com/books?id=pWRiAAAAMAAJ.

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Tao, Xingfu. "Fabrication and mechanical properties of metal matrix syntactic foams." Thesis, University of Liverpool, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.548810.

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Hong, Yifeng. "Processing of expandable thermoplastic/thermoset syntactic foam." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53895.

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While hollow glass microspheres are commonly used in syntactic foam, their abrasive and brittle properties usually result in poor processability and have adverse effects on the foam performance. Therefore, a number of attempts have been made in the industry to replace hollow glass microspheres with polymeric foamed microspheres. Among many choices, expandable thermoplastic (ETP) microspheres filled syntactic foam has shown its high potential to become a novel class of engineering materials, especially for lightweight structural applications. However, conventional processing techniques for syntactic foam usually experience difficulties such as high processing viscosity, low loading of foam fillers, and ineffective microsphere expansion. To address these emerging issues, a microwave expansion process to produce thermoset-matrix syntactic foam containing thermoplastic foam beads was developed in this thesis work. In this process, unexpanded ETP microspheres were directly foamed in uncured thermoset matrix via microwave heating. Expandable polystyrene (EPS) microspheres and epoxy resin were chosen as a model material system. The resin viscosity and specific microwave energy are found to be the two primary control parameters determining the process window. Mechanical characterization showed that the syntactic foam can outweigh neat polymer in lightweight structural applications and was effectively toughened by foamed EPS. Furthermore, the microwave expansion process was found to be capable of molding syntactic foam parts of relatively sophisticated geometry with smooth surfaces. In order to broaden its impact, the microwave expansion process was extended to produce composite EPS foam. This process converts an expandable suspension into a composite foam with a honeycomb-like barrier structure. The suspension viscosity was found to highly influence the foam morphology. Results from mechanical tests showed that the existence of the barrier structure can considerably improve the mechanical performance of the composite foam. Fire-retardation tests demonstrated that the barrier structure can effectively stop the fire path into the foam, suppress toxic smoke generation, and maintain foam structure integrity. A general formulation was developed to model the EPS expansion to optimize the microwave expansion process. A semi-analytical solution was first obtained based on the case of a single bubble expansion in an infinite matrix. The dimensionless bubble radius and pressure are defined and found to be as exponential functions of dimensionless expansion time. The semi-analytical solution can qualitatively predict the radial expansion of EPS microsphere observed in a real-time experiment. To have an accurate prediction, a numerical solution was obtained to the model that couples the nucleation and expansion of multiple bubbles in a finite matrix. The results show that the numerical solution can quantitatively predict the radial expansion of EPS. A parameter sensitivity study was performed to examine the effect of each parameter over the expansion process.

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Xue, Xiaobing. "Ti and Co-Cr-Mo matrix syntactic foams for bio-applications." Thesis, University of Liverpool, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539719.

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Al, Tenaiji Mohamed. "Characterisation of aluminium matrix syntactic foams under static and dynamic loading." Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/18857/.

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In this study, aluminium matrix syntactic foams reinforced with several types of ceramic micro-sphere were produced by pressure infiltration. The mechanical properties of a range of aluminium matrix syntactic foams were investigated in order to optimise the composition and structure to find the best configuration in terms of high energy absorption capability, and to validate the finite element predictions against the corresponding experimental results. Initially, the compressive behaviour of six different types of aluminium matrix syntactic foam was evaluated. It was shown that the size of the ceramic micro-spheres, the grade of the aluminium matrix and the volume fraction of the aluminium matrix all have a significant influence on the compressive strength and energy absorption capability of the material. Then, the three-point bending and shear fracture properties of aluminium syntactic foams were evaluated. These tests indicated that density plays an important role in determining the stiffness, specific energy absorption and ultimate flexural strain. Here, it was found that the specific energy absorption related to shear was lower than that corresponding to flexure. Following this, the behaviour of the syntactic foams under low velocity impact was characterised and the underlying failure mechanisms were identified to evaluate their effective mechanical performance. It was found that the aluminium syntactic foams subjected to drop-weight impact have 20–30% higher plateau values than samples subjected to the equivalent level of quasi-static compression. Subsequently, the Split Hopkinson Pressure Bar technique was used to investigate the behaviour of the material at high strain-rates, which highlighted the material sensitivity of aluminium syntactic foams under high strain-rate loading. Following this, terminal ballistic tests were conducted to determine the perforation resistance of the aluminium syntactic foams. The results showed that the syntactic foams have the ability to prevent the perforation of projectile velocities up to 120 m/s. Finally, blast tests were performed to investigate the influence of the charge mass and sample thickness on the dynamic response of the syntactic foams. The results showed that syntactic foams with a thickness of 14 mm have the capability to sustain a blast load of 4.82 Ns. Finite element models were developed to simulate the structural behaviour of aluminium syntactic foams subjected to various quasi-static and dynamic loads. Here, an elasto-plastic model with both ductile and shear failure criteria was employed to predict the material performance. The rate-dependent response of the foam was considered by a stress-ratio based model to take strain-rate effects into account. The numerical simulations were compared with their corresponding experimental results with reasonably good correlation. In general, the essential features of the aluminium syntactic foams tested under different loading regimes were captured by the FE models, including load-displacement traces, deformation and failure modes.

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Marek, Kenneth A. "The modeling and use of syntactic foams for passive control of fluid-borne noise." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53122.

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Syntactic foams-composite materials consisting of hollow particles embedded in a host matrix-have many applications for manufactured products, including weight reduction, thermal insulation, and noise reduction. In this thesis, a certain variety of syntactic foam is investigated with regards to reducing fluid borne noise in hydraulic systems. Such a foam maintains stiffness at low hydrostatic pressures and becomes compressible as pressure increases. With this compressibility, the foam is potentially useful as a liner for a reactive noise control device, much like compressed gas style devices currently in use; but the syntactic foam additionally adds significant damping to the system. In order to predict device performance, a linear multimodal model is developed of a hydraulic suppressor, constructed as an expansion chamber lined with a syntactic foam insert. Material models are developed for various compositions of the foam liners, based on an inverse analysis matching the model to experimental results. Two model simplifications are considered, and it is found that a simplified bulk modulus model gives sufficiently accurate results to make approximate predictions of suppressor performance. Several optimizations are performed to predict the optimal material composition for hydraulic excavator work cycles. To help compare the prototype suppressor against commercially available bladder style suppressors, a model is developed for the bladder style silencer and is validated experimentally. Overall, this work both demonstrates the current and potential utility of syntactic foam as a device lining material, and contributes new models to the hydraulics noise control community.

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Young, Peter Aerospace Civil &amp Mechanical Engineering Australian Defence Force Academy UNSW. "Fracture analysis of glass microsphere filled epoxy resin syntactic foam." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Aerospace, Civil and Mechanical Engineering, 2008. http://handle.unsw.edu.au/1959.4/38657.

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Hollow glass microspheres have been used extensively in the automotive and marine industries as an additive for reducing weight and saving material costs. They are also added to paints and other materials for their reflective properties. They have shown promise for weight critical applications, but have thus far resulted in materials with low fracture toughness and impact resistance when combined with thermosetting resins in syntactic foam. The advent of commercially available microspheres with a wide range of crushing strengths, densities and adhesive properties has given new impetus to research into syntactic foam with better fracture behaviour. Current research suggests that the beneficial effects on fracture and impact resistance gained by the addition of solid reinforcements such as rubber and ceramic particles are not seen with the addition of hollow glass microspheres. The research presented in this paper has examined the mechanisms for fracture resistance in glass microsphere filled epoxy (GMFE) syntactic foams, as well as determined the effect microsphere crushing strength and adhesion strength has on the material???s fracture toughness. The flexural properties of various GMFE have also been determined. GMFE were manufactured with varying microsphere volume fraction up to 50%, and with variances in microsphere crushing strength and adhesion. The specimens were tested for Mode I fracture toughness in a three point single edge notched bending setup as described in ASTM D5045 as well as a three point flexural setup as described in ASTM D790-3. Fracture surfaces were inspected using scanning electron microscope imaging to identify the fracture mechanisms in the presence of microspheres. Results indicate a positive effect on fracture toughness resulting from new fracture areas created as tails in the wake of the microspheres in the fracture plane. Results also indicate a negative effect on fracture toughness resulting from weak microspheres or from interfacial disbonding at the fracture plane. These two effects combine to show an increase in GMFE fracture toughness as the volume fraction of microspheres is increased to between 10 ??? 20% volume fraction (where the positive effect dominates), with a reduction in fracture toughness as microspheres are added further (where the negative effect dominates).

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Rickles, Stacey A. "Microstructural and compressive properties of a metal/ceramic syntactic foam." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/19677.

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Farrell, Gayle 1959. "Compensatory mechanisms in aphasia : production of syntactic forms that express thematic roles." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63336.

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Hourdou, Théophile. "Modélisation numérique du revêtement d'isolation thermique de canalisations pétrolières sous-marines." Electronic Thesis or Diss., Université Paris sciences et lettres, 2023. http://www.theses.fr/2023UPSLM073.

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L'installation de conduites pétrolières par la méthode de dépose en déroulé induit une flexion qui entraîne la rupture brutale de leur revêtement d'isolation thermique.Le matériau critique du revêtement est une mousse syntactique de polypropylène. Cette étude consiste à caractériser la réponse et la rupture de ce matériau sous divers états de contrainte. L'évolution de sa microstructure a été suivie emph{in-situ} en cours de déformation grâce à de la tomographie au synchrotron. Les mécanismes de décohésion sphères-matrice suivis de la coalescence avec les craquelures dans la matrice ont été mis en évidence pour amener à la rupture du matériau. Ces mécanismes ont été pris en compte dans la modélisation du comportement mécanique par une loi de comportement élasto-viscoplastique ajoutée de la porosité comme variable interne. Une modélisation fine par un procédé multi-échelles a permis de simuler l'évolution de la microstructure en lien avec une réponse macroscopique cohérente avec les données expérimentales. Les simulations numériques d'essais de laboratoire ont été utilisées pour identifier le maximum de la plus grande contrainte principale comme paramètre de chargement qui permet de localiser l'amorçage de la fissure. Des diagrammes associant ce paramètre de chargement à la vitesse de déformation locale ont été établie, selon la température d'essai. Ces diagrammes ont ensuite été comparés, avec succès, aux données issues d'essais de flexion sur tubes où le revêtement a rompu. Ainsi , la transférabilité des résultats des éprouvettes de laboratoire aux structures industrielles a donc été validée
The installation of oil&gaz pipelines using the reel-lay method induces bending which leads to a rapid cracking of their thermal insulation coating.The critical coating material consists of a syntactic glass polypropylene foam.This study deals with a comprehensive characterization of the mechanical response and the failure of this material under various stress conditions.The evolution of its microstructure was observed thanks to emph{in-situ} tensile tests using synchrotron tomography.The mechanisms of decohesion of microsphere-matrix, followed by coalescence with crazes in the matrix were highlighted, leading to the failure of the material.These mechanisms were taken into account in the constitutive relationships using an elasto-viscoplastic model with porosity added as an internal variable.Fine modelling using a multi-scale process was used to simulate the evolution of the microstructure in relation to the macroscopic response, which was consistentwith experimental data.Numerical simulations of laboratory tests were used to identify the maximum of the largest principal stress as a load parameter allowing the localization of the crack initiation.Temperature dependent diagrams associating this load parameter with the local strain rate were established.These latter diagrams were then successfully compared with data from bending tests on tubes where the coating had failed.The transferability of the results from laboratory tests to engineering structures was therefore validated

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Books on the topic "Syntacic foams"

1

Gupta, Nikhil, Dinesh Pinisetty, and Vasanth Chakravarthy Shunmugasamy. Reinforced Polymer Matrix Syntactic Foams. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01243-8.

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Rothstein, Susan Deborah. The syntactic forms of predication. Bloomington, Ind: Indiana University Linguistics Club, 1985.

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Rothstein, Susan Deborah. The syntactic forms of predication. Bloomington: Indiana University Linguistics Club, 1985.

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Metal matrix syntactic foams: Processing, microstructure, properties and applications. Lancaster, Pennsylvania: DEStech Publications, Inc., 2015.

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Update on Syntactic Foams. Smithers Rapra Technology, 2010.

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Gupta, Nikhil. Polymer Matrix Syntactic Foams: Microstructure, Properties, and Applications. Wiley & Sons, Limited, John, 2023.

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Gupta, Nikhil. Polymer Matrix Syntactic Foams: Microstructure, Properties, and Applications. Wiley & Sons, Limited, John, 2023.

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Gupta, Nikhil, Dinesh Pinisetty, and Vasanth Chakravarthy Shunmugasamy. Reinforced Polymer Matrix Syntactic Foams: Effect of Nano and Micro-Scale Reinforcement. Springer, 2013.

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Gupta, Nikhil, Dinesh Pinisetty, and Vasanth Chakravarthy Shunmugasamy. Reinforced Polymer Matrix Syntactic Foams: Effect of Nano and Micro-Scale Reinforcement. Springer London, Limited, 2013.

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Speyer, Augustin. Periphrastic verb forms. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198813545.003.0015.

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The origin of periphrastic verb forms in German is seen in the context of an articulated grammaticalization theory, where grammaticalization is understood as a series of a semantic change (‘bleaching’, read as: stripping of semantic features) followed by a syntactic reanalysis with subsequent extension. The development of several German periphrastic forms is illustrated under this view, focusing on the passive, the periphrastic perfect, and the future tense. Two waves of grammaticalization are distinguished, one in OHG (passive, perfect), one in MHG (future tense). Differences in the ordering frequencies of the non-finite and finite part of the verb form between some forms suggest structural differences, which might mirror different stages in the grammaticalization process.

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Book chapters on the topic "Syntacic foams"

1

Shutov, F. A. "Syntactic polymer foams." In Chromatography/Foams/Copolymers, 63–123. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/3-540-15786-7_7.

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Gooch, Jan W. "Syntactic Foam." In Encyclopedic Dictionary of Polymers, 725. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11489.

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Gupta, Nikhil, Dinesh Pinisetty, and Vasanth Chakravarthy Shunmugasamy. "Introduction." In Reinforced Polymer Matrix Syntactic Foams, 1–8. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01243-8_1.

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Gupta, Nikhil, Dinesh Pinisetty, and Vasanth Chakravarthy Shunmugasamy. "Summary and Future Challenges." In Reinforced Polymer Matrix Syntactic Foams, 69–71. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01243-8_10.

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Gupta, Nikhil, Dinesh Pinisetty, and Vasanth Chakravarthy Shunmugasamy. "Fillers and Reinforcements." In Reinforced Polymer Matrix Syntactic Foams, 9–17. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01243-8_2.

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Gupta, Nikhil, Dinesh Pinisetty, and Vasanth Chakravarthy Shunmugasamy. "Processing and Microstructure of Syntactic Foams." In Reinforced Polymer Matrix Syntactic Foams, 19–24. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01243-8_3.

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Gupta, Nikhil, Dinesh Pinisetty, and Vasanth Chakravarthy Shunmugasamy. "Tensile Properties." In Reinforced Polymer Matrix Syntactic Foams, 25–30. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01243-8_4.

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Gupta, Nikhil, Dinesh Pinisetty, and Vasanth Chakravarthy Shunmugasamy. "Modeling and Simulation." In Reinforced Polymer Matrix Syntactic Foams, 31–41. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01243-8_5.

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Gupta, Nikhil, Dinesh Pinisetty, and Vasanth Chakravarthy Shunmugasamy. "Compressive Properties." In Reinforced Polymer Matrix Syntactic Foams, 43–52. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01243-8_6.

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Gupta, Nikhil, Dinesh Pinisetty, and Vasanth Chakravarthy Shunmugasamy. "Flexural Properties." In Reinforced Polymer Matrix Syntactic Foams, 53–57. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01243-8_7.

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Conference papers on the topic "Syntacic foams"

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Stampley, Kamissia, Eyassu Woldesenbet, and Manu John. "Nanoclay Based Grid Stiffened Syntactic Foam Composites." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25771.

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In this research work, a novel nanoparticle based syntactic foam was employed to form a grid structure with conventional syntactic foams filled in the bay area. Initially, a big slab of the syntactic foam was fabricated and later on cut into squares. These squares were properly arranged in a mold to have an orthogrid arrangement with empty channels between them. These channels were in turn filled with nanoparticle incorporated syntactic foams and cured. Care was taken to properly orient the squares to attain the desired orthogrid geometry. K46 and S22 type of microballoons with volume fractions of 30% and 60% respectively were used in this study. The volume fraction of nanoclay used in the syntactic foams poured within the channels was 1%. Low velocity impact and flexural tests were conducted on these novel nanoparticle based grid syntactic foams. From the low velocity impact results, it is clear that the nanoclay based grid stiffened syntactic foam with S22 type microballoons in the bay area and K46 type microballoons in the grid channels performed well in terms of the load bearing capacity, elastic energy absorption and damage suppression characteristics. On the other hand, under flexural testing, it was clear that the strain at break values for the S2260K4660-1 configuration was close to that of the K4660S2230–1 configuration.

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Gupta, Nikhil, and Eyassu Woldesenbet. "Microscopic Studies of Syntactic Foams Tested Under Three-Point Bending Conditions." In ASME 2002 Engineering Technology Conference on Energy. ASMEDC, 2002. http://dx.doi.org/10.1115/etce2002/cmda-29069.

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Use of syntactic foam as core material in the sandwich structured composites is increasing due to its higher compressive strength, damage tolerance and low moisture absorption compared to the open cell structured foams. Extensive microscopic examination of the syntactic foams tested under compressive and three-point bending conditions is undertaken in this study. The aim of the investigation is to determine the local fracture mode and correlate it with the microscopic structure of the material. Local stress states are identified in the material based on the microscopic fracture features. Syntactic foam tested in the study has resin to microballoons ratio of 1.52 by weight. Compression tests were conducted on the syntactic foam specimens having two different aspect rations, which were 0.4 and 0.91. Three-point bend tests were conducted on the sandwich structures containing syntactic foam as core material and glass fabric as the skin material.

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TEWANI, H. R., MEGAN HINAUS, and PAVANA PRABHAKAR. "ADDITIVE MANUFACTURING AND MECHANICS OF MULTISCALE ARCHITECTED FLEXIBLE SYNTACTIC FOAMS." In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36452.

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Polymer syntactic foam is a lightweight composite consisting of hollow particles, like Glass Micro-Balloons (GMBs) or cenospheres, reinforced in a continuous polymer matrix. Due to their inherent weight-saving characteristics and enhanced mechanical properties, these foams are attractive for use in aerospace and marine industries. Recent advances in additive manufacturing (AM) techniques have enabled the development of complex-shaped parts of syntactic foams and circumvents the need for advanced highcost equipment to produce these parts. Selective Laser Sintering (SLS) is a widely adopted powder-based AM technique used to manufacture 3D parts by sintering polymer powder, and unlike other 3D printing methods, SLS does not require support structures. SLS has been reported to generate a segregated matrix system when used with Thermoplastic Urethane (TPU) in a standalone manner. However, the introduction of GMBs to this manufacturing method has thus far not been extensively studied. Consequently, the influence of GMB parameters on the mechanical response of syntactic foam with a segregated matrix is not fully understood. In this work, we use SLS to fabricate and further investigate the mechanical performance of segregated TPU matrix syntactic foam with different grades and volume fractions of (GMBs). We show for the first time that GMB size drives internal microscale architecture within syntactic foams that manifest as counterintuitive macroscale mechanical responses. That is, GMBs with a diameter larger than gaps between the cell walls of the segregated matrix get lodged between the cell walls while those smaller tend to get lodged inside the cell walls of the segregated matrix. Because of this, larger particles increase the stiffness of the syntactic foams while smaller ones do not contribute to this significantly. On the other hand, larger particles with their lower crushing strength reduce the densification stress of the foam, whereas the foam with smaller particles with higher crushing strength behaved similar to pure TPU but with significantly reduced weight. Overall, we show that coupling hollow particle parameters with print parameters can enable the fabrication of 3D printed syntactic foams with hierarchical tailored architectures and functional properties. These findings can be adapted to the development and design of cores for lightweight sandwich structures in the marine and aerospace industries.

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Marur, Prabhakar. "Analytical and Numerical Study of Crushing of Syntactic Foams Under Uniaxial Compression." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59264.

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Syntactic foams are a class of particulate composites made with hollow microspheres dispersed uniformly in a matrix. By the inclusion of hollow spheres in the matrix, the bulk mechanical properties are improved by limiting the bending of cell edges and localization of inelastic deformation, which is the cause of failure in the case of low-density foams. For the general class of cellular materials, several analytical and experimental methods are available in the literature to characterize the material. In the case of syntactic foams, relatively few methods exist for the computation of effective elastic properties and methods for analyzing the crush behavior of the syntactic foams are rather limited. In this research, the quasi-static crushing behavior of syntactic foam under uniaxial compression is investigated using analytical and numerical methods. To better understand the bulk behavior of syntactic foam, a micromechanical study is conducted to analyze the crushing of hollow spheres in dilute concentration. Initially the stress fields around dilute concentration are derived using continuum mechanics principles and subsequently a limit analysis is performed. To gain further insight into the deformation fields and deformations of cell walls leading to densification, a finite element (FE) analysis is performed. Assuming a periodic repetition of a representative volume of the material would correspond to the bulk material, axisymmetric and 3D finite element models are developed. The numerical computations are compared with the analytical results obtained in this study, and with experimental data reported in the literature. Using the FE models, a parametric study is conducted to investigate the influence of microsphere strength and elastic mismatch between the matrix and the inclusions on the crush behavior of syntactic foam.

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Madawela, Raghvan, Zhenyu Ouyang, Gefu Ji, Guoqiang Li, and Samuel Ibekwe. "Mechanical Properties of New Hybrid Materials: Metallic Foam Filled With Syntactic Foam." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57725.

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Syntactic polymer foam has received intensive attention and extensive application due to its remarkable low cost, lightweight, mechanical properties as well as its thermal, acoustic properties for multifunctional purpose. Electrically conductive polymers have the advantages of light weight, resistance to corrosion, good processability, and tunable conductivity. In a recent separated study, we proposed a novel conductive polymer which was based on the metallic foam filled with syntactic polymer foam. In this study, instead of focusing its unique multi-physical properties, we focus on characterizing the mechanical properties of this new conductive syntactic foam. Before the exploration of this new hybrid foam, an understanding of the mechanical properties is quite necessary. To this end, hybrid foams were prepared by varying the volume fractions of microballoons in the syntactic foam and types of microballoon materials: glass and polymer microballoons. The metallic foam adopted in this work was based on aluminum with an average relative density of 7% (the porosity is about 93%). Both compressive and bending tests were conducted. The current test results may provide the valuable baseline and also facilitate the further understanding of this hybrid foams as a core material in the advanced sandwiched pipe/pressure vessel structures featured by lightweight, impact tolerant, self-monitoring, thermal and acoustic insulation, and electromagnetic shielding.

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Vijay, Morampudi, Zhenyu Ouyang, Gefu Ji, Guoqiang Li, and H. Dwayne Jerro. "Characterization of Short Basalt Fiber Reinforced Syntactic Foams." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57730.

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Sandwiched structures with syntactic foam core and fiber reinforced composite skins may have a great potential in pipe and pressure vessel structures due to the lightweight, competitive material cost, and it thermal and acoustic insulation effects. One concern of the syntactic foam as core materials is its brittleness (low toughness). In the current study, short basalt fibers are considered as a reinforcing phase to toughen the syntactic foam material. A compressive test and a notched three-point bending test were conducted to characterize the mechanical properties of the basalt fiber reinforced syntactic foam. In order to measure the fracture toughness, in the notched three-point bending test, two inclinometers were applied to record the rotation of the notched beam. Based on a moment-rotation based formulation, the J-integral was calculated. The compressive test results showed that the compressive strength slightly decreased with the inclusion of short basalt fibers. The three point bending test indicated that with a very low fiber volume fraction (0.25% and 0.5%), there was a dramatic increase in the syntactic foam’s tensile strength, ductility and toughness.

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Wang, Lian, Kenneth G. Foote, Peter D. Theobald, and Stephen P. Robinson. "Material properties of three syntactic foams." In OCEANS 2017 - Aberdeen. IEEE, 2017. http://dx.doi.org/10.1109/oceanse.2017.8084739.

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Gomez, Sofia, Andrea Irigoyen, Stephanie Gonzalez, and Anette Baca. "Energy absorption of polymer syntactic foams." In Southwest Emerging Technology Symposium University of Texas- El Paso April 12-13, El Paso Marriott. US DOE, 2022. http://dx.doi.org/10.2172/1861033.

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Gimenez, Nelly, Vale´rie Sauvant-Moynot, and Henry Sautereau. "Wet Ageing of Syntactic Foams Under High Pressure/High Temperature in Deionized Water." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67449.

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Syntactic foams (hollow glass microspheres embedded in an organic matrix) were traditionally dedicated to buoyancy applications and are now used for thermal insulation purpose. The paper focuses on the hygrothermal ageing of such materials with model diepoxy/diamine thermoset matrix having high Tg and controlled architecture revealed by the mechanical and thermal properties and by gravimetric measurements. The ageing of syntactic foams of different volume fractions is studied under the combination of both high pressure / high temperature conditions (up to 300 bar / 100°C) to discuss the factors governing the long-term performance of these materials. Attention is paid to the degradation phenomenon observed on the foam after matrix has reached saturation and associated with markedly increase of mass gain. This study points out how the hydrolytic ageing of glass microspheres may reduce the durability of syntactic foams used in hot wet conditions.

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Wahab, M. A., V. B. Gorugantu, and Nikhil Gupta. "Enhancement of Fracture Toughness of Syntactic Foams by Rubber Addition." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82423.

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Microballoons (hollow-particles) filled polymeric composites, known as “Syntactic Foams” find extensive applications in aerospace structures, which demand careful study and testing before they can be used effectively in service conditions. Hybrid syntactic foams have been fabricated in this study with rubber reinforcements (2% rubber and 63% microballoons) and characterized for the fracture behavior. The three-point bend test results show that syntactic foams with rubber reinforcements had higher density and fracture toughness than syntactic foams without inclusion of rubber reinforcements. The load displacement curves showed a small plastic deformation region prior to the specimen fracture. Extensive scanning electron microscopy was carried out to understand the origin of the fracture toughness properties and related them to the material microstructure.

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Reports on the topic "Syntacic foams"

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Nadler, J. H., K. M. Hurysz, J. L. Clark, J. K. Cochran, and K. J. Lee. Fabrication and Microstructure of Metal-Metal Syntactic Foams. Fort Belvoir, VA: Defense Technical Information Center, January 1998. http://dx.doi.org/10.21236/ada368574.

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McEachen, G. W. Carbon syntactic foam mechanical properties testing. Office of Scientific and Technical Information (OSTI), January 1998. http://dx.doi.org/10.2172/654103.

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Keller, Jennie, Zachary Smith, Mollie Bello, and Nikolaus Lynn Cordes. Plackett-Burman Analysis of Glass Microballoon Filled Syntactic Foams. Office of Scientific and Technical Information (OSTI), August 2014. http://dx.doi.org/10.2172/1150667.

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Keller, Jennie. Literature Review: An Overview of Epoxy Resin Syntactic Foams with Glass Microballoons. Office of Scientific and Technical Information (OSTI), March 2014. http://dx.doi.org/10.2172/1123771.

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Hubbard, Neal Benson, Kimberly K. Haulenbeek, Matthew A. Spletzer, and Lyndsy Ortiz. Properties of Syntactic Foam for Simulation of Mechanical Insults. Office of Scientific and Technical Information (OSTI), February 2017. http://dx.doi.org/10.2172/1367482.

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Reser, Patrick M., Matthew W. Lewis, Jarod Clark, Nishant Ahuja, and Lary R. Lenke. Characterization of Shear Properties for APO/MBI Syntactic Foam. Office of Scientific and Technical Information (OSTI), December 2017. http://dx.doi.org/10.2172/1414077.

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Brown, Judith Alice, and Kevin Nicholas Long. Exemplar for simulation challenges: Large-deformation micromechanics of Sylgard 184/glass microballoon syntactic foams. Office of Scientific and Technical Information (OSTI), May 2018. http://dx.doi.org/10.2172/1436920.

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Brown, Judith Alice, Daniel Steck, Judith Alice Brown, and Kevin Nicholas Long. Effect of Microstructure Constraints on the Homogenized Elastic Constants of Elastomeric Sylgard/GMB Syntactic Foam. Office of Scientific and Technical Information (OSTI), August 2017. http://dx.doi.org/10.2172/1376285.

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Santa Maria, J. A., B. F. Schultz, J. B. Ferguson, N. Gupta, and P. K. Rohatgi. Effect of Hollow Sphere Size and Distribution on the Quasi-Static and High Strain Rate Compressive Properties of Al-A380-Al2O3 Syntactic Foams. Fort Belvoir, VA: Defense Technical Information Center, January 2012. http://dx.doi.org/10.21236/ada565575.

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Thomas, Strobel. A contrastive approach to grammatical doubts in some contemporary Germanic languages (German, Dutch, Swedish). Goethe-Universität Frankfurt a.M., March 2023. http://dx.doi.org/10.21248/gups.72278.

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Unquestionably (or: undoubtedly), every competent speaker has already come to doubt with respect to the question of which form is correct or appropriate and should be used (in the standard language) when faced with two or more almost identical competing variants of words, word forms or sentence and phrase structure (e.g. German "Pizzas/Pizzen/Pizze" 'pizzas', Dutch "de drie mooiste/mooiste drie stranden" 'the three most beautiful/most beautiful three beaches', Swedish "större än jag/mig" 'taller than I/me'). Such linguistic uncertainties or "cases of doubt" (cf. i.a. Klein 2003, 2009, 2018; Müller & Szczepaniak 2017; Schmitt, Szczepaniak & Vieregge 2019; Stark 2019 as well as the useful collections of data of Duden vol. 9, Taaladvies.net, Språkriktighetsboken etc.) systematically occur also in native speakers and they do not necessarily coincide with the difficulties of second language learners. In present-day German, most grammatical uncertainties occur in the domains of inflection (nominal plural formation, genitive singular allomorphy of strong masc./neut. nouns, inflectional variation of weak masc. nouns, strong/weak adjectival inflection and comparison forms, strong/weak verb forms, perfect auxiliary selection) and word-formation (linking elements in compounds, separability of complex verbs). As for syntax, there are often doubts in connection with case choice (pseudo-partitive constructions, prepositional case government) and agreement (especially due to coordination or appositional structures). This contribution aims to present a contrastive approach to morphological and syntactic uncertainties in contemporary Germanic languages (mostly German, Dutch, and Swedish) in order to obtain a broader and more fine-grained typology of grammatical instabilities and their causes. As will be discussed, most doubts of competent speakers - a problem also for general linguistic theory - can be attributed to processes of language change in progress, to language or variety contact, to gaps and rule conflicts in the grammar of every language or to psycholinguistic conditions of language processing. Our main concerns will be the issues of which (kinds of) common or different critical areas there are within Germanic (and, on the other hand, in which areas there are no doubts), which of the established (cross-linguistically valid) explanatory approaches apply to which phenomena and, ultimately, the question whether the new data reveals further lines of explanation for the empirically observable (standard) variation.

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