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VanHouten D.J.,Owens Corning Science and Technology | Smith W.E.,Owens Corning Science and Technology | Rinne S.A.,Owens Corning Science and Technology | Hartman D.R.,Owens Corning Science and Technology
Annual Technical Conference - ANTEC, Conference Proceedings | Year: 2012

A new class of thermoplastic reinforcements was recently developed using technology whereby carbon nanostructures (CNS) are grown on the surface of glass fibers. This hybrid reinforcement results in specialized, multifunctional thermoplastic compounds that exhibit 60 dB of electromagnetic interference (EMI) shielding. This paper will discuss the recent research that has been conducted in incorporating the carbon nanostructure/glass fiber hybrid into polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) and polyamide-6,6 (PA-6,6) and give a highlight of the material properties of the resulting compounds.

Korwin-Edson M.L.,Owens Corning Science and Technology | Hofmann D.A.,Owens Corning Science and Technology | Mcginnis P.B.,Owens Corning Science and Technology
International Journal of Applied Glass Science | Year: 2012

The practical strength of glass is highly dependent on the amount and type of damage that a glass article has experienced in its lifetime and can be 50% less than its theoretical strength. Glass reinforcement fibers in the pristine state exhibit some of the highest failure strengths of any glass form. Strength degradation is a sequential process the further from the point of formation a glass travels. Individual filament strength is important in the manufacturing process as the fiber interacts with water, HVAC, sizing applicators, contact shoes, and guide eyes and ultimately this combination impacts productivity. A discussion of glass fiber strength - pristine versus usable, and the effects of temperature, humidity, and composition on glass strength follows in this manuscript. New data collected in Owens Corning's Glass Properties Laboratory on the effect of temperature and relative humidity on strength and modulus for Advantex® glass, Owens Corning's S-glass (XStrand®S, FliteStrand®S, and ShieldStrand®S) and H-glass (WindStrand®H) are presented. Owens Corning's understanding of the effect of composition on strength and modulus, and particularly how individual oxides contribute to these properties are shared. © 2012 The American Ceramic Society and Wiley Periodicals, Inc.

Stickel J.M.,Owens Corning Science and Technology | Nagarajan M.,Owens Corning Science and Technology
International Journal of Applied Glass Science | Year: 2012

Glass fiber-reinforced composite materials are attractive because their properties can be tailored to meet the specific needs of a variety of applications. The mechanical and thermal properties of a composite generally follow the rule of mixtures. As glass fiber is the major component at 70-75% by weight (50-60% by volume), selection of the correct glass product is critical. Glass fiber reinforcement is available in many forms, including continuous rovings, chopped fibers, fabrics, and nonwoven mats. In addition to form, selection of a reinforcement product involves choosing a glass type, chemistry on the glass (sizing) filament diameter, and tex. Glass formulation or type governs mechanical, thermal, and corrosion properties, whereas sizing protects the glass during handling and gives compatibility with the resin system. Filament diameter and strand tex are chosen to balance physical properties and manufacturing efficiency. A significant amount of tensile strength, up to 50%, may be lost from a pristine single filament to a multi-filament roving. To minimize this degradation, the utmost care and consistency must be exercised in the fiber forming process. This, coupled with selection of a high-performance glass formulation, enables use of composites in highly demanding applications, such as pressure vessels and ballistic armor. © 2012 The American Ceramic Society and Wiley Periodicals, Inc.

Bemis B.L.,Owens Corning Science and Technology
Ceramic Engineering and Science Proceedings | Year: 2013

The physics of formation of pendant drops has been extensively studied for many years, however drops formed during the production of glass fibers present a challenging twist to the classic predictions of constant property axisymmetric drop formation. In the case of melt spinning of silicate glasses the process starts from the formation of a pendant drop and its subsequent detachment from the capillary, where under the correct conditions it creates a trailing fiber as it falls. Thermal and flow conditions on the drop vary substantially in the azimuthal, radial and axial directions, which coupled with the temperature dependent properties of glass melts, create a unique departure from simple pendant drop formation and breakaway. These deviations are important to those designing fiberizing processes. Before embarking on a full three dimensional simulation, a study focused on a two dimensional axisymmetric simulation and its comparison to analytical and experimental results was undertaken to illustrate the difference between the formation of a non-isothermal glass drop and a constant property drop.

Choudhary M.K.,Owens Corning Science and Technology | Venuturumilli R.,ANSYS Inc. | Hyre M.R.,Virginia Military Institute
International Journal of Applied Glass Science | Year: 2010

This article reviews the scientific and engineering principles and practices involved in the mathematical modeling of flow and heat transfer phenomena in industrial-scale glass melting, delivery, and forming processes. The approach taken is to highlight the characteristic features of flow and heat transfer in each of the three processes, summarize the relevant transport and constitutive equations and boundary conditions, and illustrate practical applications of mathematical models. The article also describes modeling approaches used for auxiliary processes and phenomena associated with melting, delivery, and forming operations. Thus, modeling of batch melting, electric heating of glass melt, convection due to bubbling, combustion, turbulence, and viscoelasticity are discussed. Unlike melting and delivery processes, which share many similarities across the various glass industry segments, forming tends to be segment specific. So, the article focuses on one forming process (container) and, through it, emphasizes the key technical attributes of forming models. A selection of results is provided to bring out modeling capabilities and limitations. The article also provides a historical perspective on the development of advanced mathematical models and their industrial applications. Finally, key areas needing research and development are identified to further enhance the practical utility of mathematical models for the glassmaking processes. © 2010 Owens Corning Science and Technology Journal compilation © 2010 The American Ceramic Society and Wiley Periodicals, Inc.

Choudhary M.K.,Owens Corning Science and Technology
ASHRAE Transactions | Year: 2016

The paper extends the application of a correlation-based approach developed earlier and adopted by the AHRAE Standing Standard Project Committee (SSPC) 90.1 for calculating the overall heat transfer coefficients (the U-factors) of single and double layered fiberglass metal building (MB) insulation assemblies to assemblies where insulation is used in a manner designed to fill up the space (the cavity,) between the two consecutive structural elements (purlins or girts). These assemblies may involve either single or multiple insulation layers, and the cavity may be filled to various extents. The paper describes a general technical approach to calculate the thermal resistances of various regions of an MB insulation assembly, namely regions beyond, underneath, and above the structural units. These zonal thermal resistances are combined into a single, overall or system thermal resistance, Rinsul-sys using series and parallel combinations while also allowing for the thermal short circuiting or preferential heat flow through the metallic structural elements and the thermal resistances of the ambient air. The correlation, referred to as the Choudhary correlation, calculates the assembly U-factor to R insul-sys using the following equation. {equation presented} In the above equation U is in Btu/ft2· h·°F and R is in ff2·h·°F/Btu (1 Btu/ft2·h·deg;F = 5.6782 W/m2K and 1 ft2·h·deg;F/Btu = 0.17611 m2K/W). The U-factors for 13 MB insulation assemblies, consisting of a wide range of fiberglass insulations calculated using the correlation, are found to be in 93.5% to 100% agreement with the values calculated using three-dimensional numerical approaches. In addition, for four assemblies for which measured U-factors were available, the correlation based results were in 91% to 100% agreement with the measured values. The Choudhary correlation is strictly applicable to a fixed spacing of 5 ft (1.52 m) between two consecutive structural elements. © 2016 ASHRAE.

Hartman D.,Owens Corning Science and Technology | Claussen G.,Owens Corning Science and Technology | Vanhouten D.,Owens Corning Science and Technology
IEEE International Symposium on Electromagnetic Compatibility | Year: 2012

Carbon enhanced reinforcements (CER) for multifunctional composite design were recently developed using technology where carbon nanostructures (CNS) are synthesized on the surface of glass fibers in a continuous, in-line, production scalable process. The hybrid reinforcement results in a highly conductive multifunctional capability in thermoset and thermoplastic resins that enables excellent electromagnetic interference (EMI) shielding performance. This paper discusses the development and industrialization of the carbon nanostructure-glass fiber hybrid pelletized in thermoplastic masterbatches of polycarbonate-acrylonitrile-butadiene-styrene (PC/ABS), polyamide-6,6 (PA-6,6), polycarbonate (PC), and polypropylene (PP). It reviews the electrical, thermal and mechanical properties of the compounds for engineered solutions in injection molded electromagnetic compatability (EMC) applications. © 2012 IEEE.

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