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Competencies Required for the Design and Implementation of Manufacturing Systems for Advanced Composite Structures

Description: The problem with which this investigation is concerned is that of identifying and prioritizing the competencies required to design and implement manufacturing systems for advanced composite structures. The classical Delphi procedure is the research method used for the conduct of this study. A five-member advisory board developed a list of seventeen categories under which the competencies would reside. In the first-round questionnaire, the seventeen categories were presented to a Delphi panel of… more
Date: May 1986
Creator: Lange, Robert Douglas
Partner: UNT Libraries
open access

Length and strain-rate effects on the probability of failure of two boron reinforcing monofilaments

Description: BS>Breaking-strength data from one-inch gage-length specimens and Weibull statistical techniques are used to characterize the probability of failure dependence on the length of brittle tungstencore and carbon-core boron monofilaments. Experimental results, using longer-gage-section specimens, are in good agreement with the failure probability predicted by the Weibull function. Strain-rate effects on the probability of failure of both materials are investigated over the quasistatic range from 3.… more
Date: October 29, 1973
Creator: Oakes, R.E. Jr.
Partner: UNT Libraries Government Documents Department
open access

Field-structured composite studies.

Description: Field-structured composites (FSCs) were produced by hosting micron-sized gold-coated nickel particles in a pre-polymer and allowing the mixture to cure in a magnetic field environment. The feasibility of controlling a composite's electrical conductivity using feedback control applied to the field coils was investigated. It was discovered that conductivity in FSCs is primarily determined by stresses in the polymer host matrix due to cure shrinkage. Thus, in cases where the structuring field was … more
Date: April 1, 2004
Creator: Martin, James Ellis & Williamson, Rodney L.
Partner: UNT Libraries Government Documents Department
open access

CRADA Final Report for NFE-08-01826: Development and application of processing and processcontrol for nano-composite materials for lithium ion batteries

Description: Oak Ridge National Laboratory and A123 Systems, Inc. collaborated on this project to develop a better understanding, quality control procedures, and safety testing for A123 System’s nanocomposite separator (NCS) technology which is a cell based patented technology and separator. NCS demonstrated excellent performance. x3450 prismatic cells were shown to survive >8000 cycles (1C/2C rate) at room temperature with greater than 80% capacity retention with only NCS present as an alternative to co… more
Date: December 15, 2012
Creator: Daniel, C.; Armstrong, B.; Maxey, C.; Sabau, A.; Wang, H.; Hagans, P. (A123 Systems, Inc.) et al.
Partner: UNT Libraries Government Documents Department
open access

3-D Measurement of Deformation Microstructure of Al(0.2%)Mg Using Submicron Resolution White X-Ray Microbeams

Description: We have used submicron-resolution white x-ray microbeams on the MHATT-CAT beamline 7-ID at the Advanced Photon Source to develop techniques for three-dimensional investigation of the deformation microstructure in a 20% plane strain compressed Al(0.2%)Mg tri-crystal. Kirkpatrick-Baez mirrors were used to focus white radiation from an undulator to a 0.7 x 0.7 {micro}m{sup 2} beam that was scanned over bi- and tri-crystal regions near the triple-junction of the tri-crystal. Depth resolution along … more
Date: November 29, 1999
Creator: Larson, B. C.; tamura, N.; Chung, J.-S.; Ice, G. E.; Budai, J. D.; Tischler, J. Z. et al.
Partner: UNT Libraries Government Documents Department
open access

Final Scientific Report, New Proton Conductive Composite Materials for PEM Fuel Cells

Description: This project covered one of the main challenges in present-day PEM fuel cell technology: to design a membrane capable of maintaining high conductivity and mechanical integrity when temperature is elevated and water vapor pressure is severely reduced. The DOE conductivity milestone of 0.1 S cm-1 at 120 degrees C and 50 % relative humidity (RH) for designed membranes addressed the target for the project. Our approach presumed to develop a composite membrane with hydrophilic proton-conductive inor… more
Date: November 8, 2010
Creator: Lvov, Serguei
Partner: UNT Libraries Government Documents Department
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Concrete-polymer composites: current status and future research needs

Description: When plastics are combined with mixtures of inorganic materials, high-strength, durable, fast-setting composites are produced. These materials are used in structural engineering and other applications, and as a result of the successes obtained to date, considerable research and development work is in progress throughout the world. One family of polymer-based composites receiving considerable attention is the concrete-polymer materials. Work in this area is directed toward developing new high-st… more
Date: April 1, 1981
Creator: Kukacka, L. E.
Partner: UNT Libraries Government Documents Department
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MiniSAR composite gimbal arm development.

Description: An exploratory effort in the application of carbon epoxy composite structural materials to a multi-axis gimbal arm design is described. An existing design in aluminum was used as a baseline for a functionally equivalent redesigned outer gimbal arm using a carbon epoxy composite material. The existing arm was analyzed using finite element techniques to characterize performance in terms of strength, stiffness, and weight. A new design was virtually prototyped. using the same tools to produce a de… more
Date: January 1, 2005
Creator: Klarer, Paul Richard & Winscott, Mark (Orion International, Albuquerque, NM)
Partner: UNT Libraries Government Documents Department
open access

On the Permeability of Porous Materials

Description: Note presenting an investigation of the effects on porous-material permeability characteristics of the absolute pressure level, choking of the flow, bending the material, and other factors. Experiments showed permeability characteristics to be appreciably affected by absolute pressure level, flow choking, and thickness of the material. Results regarding testing with wire cloth and sintered metal are provided.
Date: January 1956
Creator: Yates, E. Carson, Jr.
Partner: UNT Libraries Government Documents Department
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Fabrication and Properties of Hot-Pressed Molybdenum Disilicide

Description: Report presenting an investigation of hot-pressed molbdenum disilicide bodies produced by industrial processes at a temperature of 2950 degrees and a pressure of 3000 pounds per square inch. Results regarding the short-time tensile strength, stress-rupture data, compression strength, air-corrosion resistance, hardness, coefficient of linear thermal expansion, thermal conductivity, and density are provided.
Date: May 26, 1950
Creator: Long, Roger A.
Partner: UNT Libraries Government Documents Department
open access

Glass: Producing Glass Fiber

Description: As detailed in the fact sheet, this new glass fiber-producing process can yield fibers that are more uniform in diameter, break less easily, and be produced more economically.
Date: January 29, 1999
Creator: Recca, L.
Partner: UNT Libraries Government Documents Department
open access

A Micromechanical Constitutive Model of Progressive Crushing in Random Carbon Fiber Polymer Matrix Composites

Description: A micromechanical damage constitutive model is presented to predict the overall elastoplastic behavior and damage evolution in random carbon fiber polymer matrix composites (RFPCs).To estimate the overall elastoplastic damage responses,an effective yield criterion is derived based on the ensemble-volume averaging process and first-order effects of eigenstrains due to the existence of spheroidal (prolate) fibers.The proposed effective yield criterion,to ether with the assumed overall associative… more
Date: September 1999
Creator: Lee, H. K. & Simunovic, S.
Partner: UNT Libraries Government Documents Department
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Development of a low loss magnetic composite utilizing amorphous metal flake. Second semi-annual progress report, March 19-September 18, 1979

Description: Composite specimens of amorphous metal flakes have been made using several different binders and several different compaction parameters. The binders have included epoxies, anaerobic adhesives, polyimides, polyamideimides, polyeherimides, and polyesterimides. Compaction variables included the time, temperature and pressure of compaction; flake size, and flake alignment. The best results were achieved using a polyetherimide and aligned flake. Packing factors of 87% were achieved in specimens whi… more
Date: October 1, 1979
Partner: UNT Libraries Government Documents Department
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Philosophy for nondestructive testing of fiber composites

Description: A discussion of a nondestructive testing philosophy for fiber composites is presented. The position is taken that the nondestructive test indications must be quantitatively correlated to the required engineering performance properties of the composite article. The currently unknown defect strcture in many fiber composites is discussed with respect to nondestructive testing. A few examples from the literature of the above described quantitative nondestructive testing of fiber composites are pres… more
Date: April 1, 1977
Creator: Hamstad, M. A.
Partner: UNT Libraries Government Documents Department
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Waste Materials from Tetra Pak Packages as Reinforcement of Polymer Concrete

Description: This article discusses how compressive and flexural strength and modulus of elasticity decrease gradually, when either Tetra Pak particle concentration or particle size is increased.
Date: September 28, 2015
Creator: Martínez-López, Miguel; Martínez-Barrera, Gonzalo; Barrera-Díaz, Carlos; Ureña-Núñez, Fernando & Brostow, Witold, 1934-
Partner: UNT College of Engineering
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Development of a glass polymer composite sewer pipe from waste glass. Final report

Description: A range of polymer-aggregate composites for applications in industry which appear to be economically attractive and contribute to energy conservation were developed at BNL. Waste glass is the aggregate in one such material, which is called glass-polymer-composite (GPC). This report assays the economics and durability of GPC in piping for storm drains and sewers. The properties of the pipe are compared statistically with the requirements of industrial specifications. These establish the raw mate… more
Date: February 1, 1980
Creator: Rayfiel, R. & Kukacka, L. E.
Partner: UNT Libraries Government Documents Department
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Development of the Resin Infusion between Double Flexible Tooling process : assessment of the viability of in-mold coating and implementation of UV curing.

Description: As composites gain wider acceptance in all sectors of the economy, new methodologies must be developed to increase their cost effectiveness in manufacturing. The neoteric Resin Infusion between Double Flexible Tooling (RIDFT) process is undergoing modifications to improve its cost-effectiveness by developing methodologies for in-mold coating and the incorporation of UV curing. In-mold coating is desired by the composites industry since it eliminates the current paint process, which is not only … more
Date: December 1, 2004
Creator: Okoli, Okenwa I. (. FAMU-FSU College of Engineering, Tallahassee, FL)
Partner: UNT Libraries Government Documents Department
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