| High Performance Crystalline Organic Transistors and Circuit |
02 AUG 2011 |
24 pages |
| Authors:
Ananth Dodabalapur; TEXAS UNIV AT AUSTIN
|
 | We have examined the best available small molecule crystalline organic semiconductors as active layers in thin-film transistors. We have optimized the field-induced conductance, a figure of merit that will relate directly to circuit speeds. A simple figure of merit - the product of the field-effect mobility and effective relative dielectric constant of the gate insulator (or mobility times the product of capacitance per unit area and total insulator thickness for ... |
|
| Direct Fabrication of a-Si:H Thin Film Transistor Arrays on Plastic and Metal Foils for Flexible Displays |
Dec-2008 |
6 pages |
| Authors:
S M O'Rourke; D C Morton; G B Raupp; N Colaneri; J Haq; S M Venugopal; D R Allee; J P Kaminski; R Naujokaitis; J Dailey; D Bottesch; M Marrs; B P O'Brien; S K Ageno; E J Bawolek; C Moyer; D E Loy; E W Forsythe; ARIZONA STATE UNIV TEMPE
|
| In this paper we describe solutions to address critical challenges in direct fabrication of amorphous silicon thin film transistor (TFTs) arrays for high information content active matrix flexible displays for Army applications. For all flexible substrates a manufacturable handling protocol in automated display-scale equipment is required. For metal foil substrates the principal challenges are planarization and electrical isolation, and management of coefficient of thermal expansion induced stress (CTE mismatch) during ... |
|
| Quench-Protection Strategies for HTS Superconductors |
24 AUG 2005 |
87 pages |
| Authors:
William N. Lawless; CERAM PHYSICS INC WESTERVILLE OH
|
| Assessments are made of four distinct strategies for the quench protection of HTS coils near 77 K - diamond-film insulation, cryovaristor current shunt, loaded Formvar insulation, and a sputtered ceramic insulation. An improved three-dimensional thermal modeling of quench protection is developed which provides guidelines for judging the strategies. Boundary scattering depresses the thermal conductivity of diamond films and Kapitsa resistance depresses the thermal conductivity of loaded Formvar insulation, rendering these ... |
|
| Amphibious Antennas for Providing Near Vertical Incidence Skywave Communication |
23 FEB 2005 |
12 pages |
| Authors:
David R. Rivera; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| This patent application discloses an amphibious antenna for providing Near Vertical Incidence Skywave (NVIS) communication when grounded to a conductive fluid. The amphibious antenna has a support member for supporting a helix. The helix includes a first helical arm that is not insulated and grounded, when in use, through a conductive fluid into which the antenna is placed, and a second helical arm that is insulated from the conductive fluid. ... |
|
| Defects in Ion-Implanted Silicon Carbide |
01 JUL 2004 |
5 pages |
| Authors:
Mulpuri V. Rao; GEORGE MASON UNIV FAIRFAX VA
|
| Defects that introduce electrically active deep levels in ion- implanted Silicon Carbide (SiC) were studied by performing capacitance Deep- Level Transient- Spectroscopy (DLTS) and transconductance frequency dispersion measurements on fully implanted MESFETs in bulk semi-insulating 4-H SiC, MISFETs in 6-H SiC and double implanted p-n and n-p junction diodes in 4-H SiC. The junction diodes made with aluminum and phosphoms implantations exhibited higher reverse leakage current compared to those made ... |
|
| EPA's SF6 Emission Reduction Partnership: Maximizing the Benefits of SF6 Emission Reductions for Electric Utilities |
APR 2004 |
7 pages |
| Authors:
Jerome Blackman; Ravi Kantamaneni; ENVIRONMENTAL PROTECTION AGENCY WASHINGTON DC
|
| First manufactured in 1902, sulfur hexafluoride (SF6) is a fluorinated compound with an extremely stable molecular structure. This structure makes it far superior to oil or air in its insulation properties, dielectric strength, and arc quenching abilities. Electric equipment manufacturers and utilities therefore rely heavily on SF6 in transmission systems. In 2001, electric utilities and electrical equipment manufacturers, taken together, purchased over 80 percent of all SF6 produced worldwide. Under ... |
|
| p-Type Transparent Electronics |
25 SEP 2003 |
95 pages |
| Authors:
Melinda M. Valencia; OREGON STATE UNIV CORVALLIS
|
| The objective of this thesis is to contribute to the development of p-type materials for transparent electronics applications. Thin films of ?-BaCu2S2, a p-type semi-transparent semiconductor, are fabricated and characterized. ?-BaCu2S2 has a transmittance of 60% to 80 % in the visible portion of the electromagnetic spectrum. The mobility, conductivity, and carrier concentration of ?-BaCu2S2 are 3.5 cm2/V-s 17 S/cm, and 1019 cm−3, respectively. The potential use of BaCu2S2 in ... |
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| Process for Continuous Foam Extrusion of Thermoplastic Polymers Via Syntactic and Chemical Foaming Agents |
11 AUG 2003 |
22 pages |
| Authors:
Donald V. Beauregard; Nick R. Schott; Stephen A. Orroth; Lawrence J. Trainer; Judith A. Jones; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A process for producing an electrical insulative material. First there is produced a composition including a thermoplastic polymer resin selected from the group consisting of a polyethylene octene, a polyethylene hexene, a polyethylene heptene, a polyethylene nonene and a polyethylene decene; a filler selected from the group consisting of expandable polymer microballoons and glass microspheres; and a blowing agent comprising a physical blowing% agent and% a chemical blowing agent. The ... |
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| Design and Fabrication of High-Temperature, Radial Magnetic Bearing for Turbomachinery |
JUL 2003 |
18 pages |
| Authors:
Gerald Montague; Mark Jansen; Ben Ebihara; Ralph Jansen; Alan Palazzolo; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH GLENN RESEARCH CENTER
|
| Motors, magnetic bearings, and other electromagnetic actuators that can operate at 1000 degrees F (540 degrees C) hold great promise for providing increased efficiency in machinery for many applications ranging from pebble-bed nuclear reactors and chemical processing to aircraft and unmanned aerial combat vehicle (UCAV) propulsion systems. This report discusses in detail the design and fabrication of a high-temperature, heteropolar, radial magnetic bearing that was operated at 1000 degrees F ... |
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| A Critical Review of Fast Transient Breakdown in Solid Insulators |
MAR 2003 |
63 pages |
| Authors:
A. Wraight; Richard Hoad; C. Thomas; QINTIQ LTD HANTS (UNITED KINGDOM) CENTRE FOR HUMAN SCIENCES
|
| This report critically reviews currently available information on the subject of fast transient breakdown in solid dielectric insulators. Information is readily available on breakdown in solids under DC or low frequency conditions, as research into these areas has been driven by the power generating industries over many years. However, pulsed systems are generally constructed using safety factors or DC breakdown values for incorporated insulators. More recently fast transient (sub-nanosecond) breakdown ... |
|
| Workshop on Dielectric Properties and Electrical Breakdown of Biological Membranes |
DEC 2002 |
29 pages |
| Authors:
Karl H. Schoenbach; OLD DOMINION UNIV RESEARCH FOUNDATION NORFOLK VA
|
| "Dielectric Properties and Electrical Breakdown of Biological Membranes" was the topic of a workshop at the Conference on Electrical Insulation and Dielectric Phenomena on October 20, 2002, in Mexico. The workshop, supported by the IEEE Dielectrics and Electrical Insulation Society, the US AFOSR and ONR, was organized by Karl H. Schoenbach. The presentations focused on nonthermal biological effects caused by high power pulsed electric fields. The interest in this topic ... |
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| Metal Foams as Compact High Performance Heat Exchangers |
30 MAY 2001 |
22 pages |
| Authors:
K. Boomsma; D. Poulikakos; F. Zwick; ABB CORPORATE RESEARCH DAETTWILL (SWITZERLAND) DEPT OF MATERIALS SCIENCE AND TECHNOLOGY
|
|
| GaN MISFETs |
13 JUN 2000 |
6 pages |
| Authors:
Dimitris Pavlidis; MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| Objectives are to conduct experimental and theoretical studies to demonstrate and analyze the advantages offered by AlN/GaN MISFETs: MOCVD Growth of high-quality AlN/GaN heterostructures; Simulate AlN/GaN MIS structures and MISFETs; Develop high-power AlN/GaN MISFETs and Amplifiers; Characterize DC, low- and high-frequency, and power performance of AlN/GaN MISFETs. |
|
| Flexible Cable Providing EMI Shielding |
07 JUN 1999 |
23 pages |
| Authors:
William J. Prysner; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A flexible cable which includes a Faraday shield sheath formed of a high permeability ferrous alloy filled matrix binder of conductive elastomers, to provide electromagnetic interference (EMI) isolation between the ambient environment about the cable and a conductor line or lines within the cable, or vice versa. The flexible cable shield may be embodied as a flexible electrical cable that comprises at least the elements of a single electrically conductive ... |
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| Cable Integrity Tester |
02 JUN 1998 |
|
| Authors:
Foster L. Striffler; DEPARTMENT OF THE NAVY WASHINGTON DC
|
 | A testing apparatus for determining the integrity of an electrical cable. Successive portions of electrical cable pass through an aqueous electrolyte with a distance measurement unit providing an indication of the position of a portion of the cable located in the electrolyte, A capacitance measurement unit connects to a selected conductor in the cable and to an electrode in the electrolyte to continuously generate a measured capacitance signal. An X-Y ... |
|
| Field Emitter Cell and Array with Vertical Thin-Film-Edge Emitter. |
23 MAR 1998 |
35 pages |
| Authors:
David S. Hsu; Henry F. Gray; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A field emitter cell includes a thin film edge emitter normal to a gate layer. The field emitter is a multilayer structure including a low work function material sandwiched between two protective layers. The field emitter may be fabricated from a composite starting structure including a conductive substrate layer, an insulation layer, a standoff layer and a gate layer, with a perforation extending from the gate layer into the substrate ... |
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| Method of Making Buried Gate Insulator Field Effect Transistor |
06 JAN 1998 |
|
| Authors:
Monti E. Aklufi; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A buried, gate insulator field effect transistor is disclosed. It comprises a source, drain, substrate, gate, and a gate insulator layer separating the gate from the source, drain and substrate; and a protective silicon dioxide covering layer. Windows are excised into this covering layer to allow electrical connection to the source, substrate, drain, and gate. The substrate and gate are vertically aligned in the resulting structure. The source, drain and ... |
|
| Interface Properties of Wide Bandgap Semiconductor Structures |
DEC 1997 |
127 pages |
| Authors:
R. F. Davis; S. Bedair; J. Bernholc; R. J. Nemanich; Z. Sitar; NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| Exposure of selected areas of particular GaN samples with He-Cd laser light (3.8 eV) revealed a persistent and marked decrease in the near band edge photoluminescence (PL) intensity emitted from these areas. This ability to modulate PL emission intensity at individual points in these materials can be exploited as a method for optical data storage. A means of erasing information stored using this effect has also ... |
|
| Design and Manufacturing Final Report for Alternate Fixed Distributed Systems (FDS) Deep Water Trunk Cable, Phases I and II |
MAY 97 |
76 pages |
| Authors:
T. Stamnitz; K. Rogers; SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA
|
| This document covers the design and manufacturing of Alternate Deep Water Trunk Cable (ADWT), developed by the Naval Command, Control and Ocean Surveillance Center RDT&E Division, Advanced Applications Branch, for the Fixed Distributed Systems (FDS) Program Office-PMW 184, Naval Space and Warfare Systems Command. The purpose of this document is to provide information both on the specific design variations pursued by the various cable suppliers, and to provide insight on ... |
|
| Ion Implantation Buried Gate Insulator Field Effect Transistor |
11 FEB 1997 |
|
| Authors:
Monti E. Aklufi; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A buried, gate insulator field effect transistor is disclosed. It comprises a source, drain, substrate, gate, and a gate insulator layer separating the gate from the source, drain and substrate; and a protective silicon dioxide covering layer. Windows are excised into this covering layer to allow electrical connection to the source, substrate drain, and gate. The substrate and gate are vertically aligned in the resulting structure. The source, drain and ... |
|
| Process for Manufacturing a Fiber Reinforced Optic Microcable with a UV Cured Resin. |
14 JAN 1997 |
|
| Authors:
Steven J. Cowen; Christopher M. Young; James H. Dombrowski; Michael E. Kono; James H. Daughtry; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The invention provides a process for fabricating a fiber optic microcable composed of materials having properties which facilitate its manufacture. The microcable is comprised of an optical fiber core, a buffer surrounding the core, and a protective sheath surrounding the buffer consisting of an electromagnetic radiation cured resin impregnated with fibers suspended in the resin to enhance the resistance of the microcable to physical damage. The microcable is fabricated by ... |
|
| Semiconductor-on-Insulator Device Interconnects. |
24 DEC 1996 |
|
| Authors:
Ronald E. Reedy; Graham A. Garcia; Isaac Lagnado; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A process for developing conductive interconnect regions between integrated circuit semiconductor devices formed on an insulating substrate utilizes the semiconductor material itself for formation of device interconnect regions. A patterned layer of semiconductor material is formed directly on the surface of an insulating substrate. The patterned layer includes regions where semiconductor devices are to be formed and regions which are to be used to interconnect terminals of predetermined ones of ... |
|
| Leak Detector for Conductive Liquid Boiler. |
01 OCT 1996 |
|
| Authors:
Bryan L. Croft; Howard M. Spackman; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A leak detector for detecting a leak of an electrically conductive fluid from a vessel comprises an electrically conductive wire having a melting temperature less than an internal temperature of the vessel and greater than the external temperature of the vessel. The wire is stitched to a heat resistant fabric to hold the wire in place and to thermally and electrically insulate the wire when no leaking fluid is present. ... |
|
| Method for Preparation of Mask for Ion Beam Lithography. |
OCT 1996 |
|
| Authors:
Joseph Yahalom; Martin Peckerar; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A mask for ion beam lithography is made by coating a front side, sidewalls, and a backside of a substrate with an insulating layer; opening, on the front side of the substrate, a window in the insulating layer to expose a front substrate surface; depositing an oxide membrane on the front substrate surface; opening a portion of the insulating material on the backside of the substrate to form an exposed ... |
|
| Advanced Simulator Insulator Program, Second Annual Report |
01 JUN 96 |
95 pages |
| Authors:
Ian Roth; Steven Ashby; Kendall Childers; Morris A. Mendelsohn; Lyon Mandelcorn; PHYSICS INTERNATIONAL CO SAN LEANDRO CA
|
| This report summarizes the work performed during the second year of the Advanced Simulator Insulator Development Program. We developed a dendrite resistant insulator coating that does not chip like the Limitrak coating presently used. The coating material has an impact resistance 80 times larger than Limitrak. It has a dc vacuum surface flashover resistance 27% greater than Limitrak, and dendrite resistance that is larger as well. We also made urethane ... |
|
| Formation of Semiconductor Interfaces: Proceedings of the Fifth International Conference on the Formation of Semiconductor Interfaces, Princeton, NJ, USA, June 26-30,1995 |
96 |
|
| Authors:
A. Kahn; R. Ludeke; PRINCETON UNIV NJ
|
| This special volume contains the proceedings of the Fifth International Conference on the Formation of Semiconductor Interfaces. This fifth edition of the conference is aimed at providing a review of state of the art experimental and theoretical research on structural and electronic properties of semiconductor interfaces. The scientific program focused on various aspects of (1) semiconductor nanostructures, (2) thin insulators on semiconductors, (3) highly lattice mismatched heterostructures, (4) passivation and ... |
|
| The Effect of Cesium Vapour on the Bulk Conductivity of Plasma - SprayedAlumina |
12 JUN 1995 |
11 pages |
| Authors:
P. Agnew; J. Ing; AEA TECHNOLOGY PLC DIDCOT (UNITED KINGDOM) MATERIALS AND CHEMISTRY DIV
|
| The thermionic fuel elements (TFEs) of the TOPAZ-II space nuclear power system sit in cylindrical channels in the reactor core and are separated from the NaK coolant channels by a 50 microns gap filled with helium at around 100 Torr. Ideally there would be no contact between the outer metallic surface of the TFE collector and the coolant channel. However in practice mechanical forces and ... |
|
| Steerable Acoustic Transducer. |
06 APR 1995 |
24 pages |
| Authors:
Jan F. Lindberg; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An acoustic transducer is constructed as a stacked configuration of multilayer transducer elements separated from one another by an electrical insulating material. Each multilayer transducer element has a layer of acoustically transparent electroacoustic transducer material having opposing planar surfaces with electrically conductive material deposited thereon. For each multilayer transducer element, the electrically conductive material is formed into parallel strips electrically isolated from one another on at least one of each ... |
|
| Investigation of GaAs Layers Grown by Molecular Beam Epitaxy at Low Temperature |
10 MAR 95 |
|
| Authors:
Chang-Lee Chen; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
| Over the three-year course of this program, the low-temperature- grown (LTG) GaAs and AlGaAs have been incorporated as the gate insulator or surface passivation in a variety of field-effect-transistors (FETs). The LTG gaAs used as the surface passivation layer in a metal-semiconductor FET (MESFET) with a novel overlapping gate structure increased the breakdown voltage by two folds compared to a regular MESFET. The LTG GaAs passivation also greatly improved the ... |
|
| Total Dose Radiation Effects on Hardened SOI Bipolar Transistors Using the NPS LINAC |
MAR 95 |
94 pages |
| Authors:
Donald R. Brittain Jr.; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Silicon-on-insulator bipolar transistors fabricated using the Harris UHF-1 process, were irradiated at room temperature with 30 and 60 MeV electron beams. Some of the transistors on each die were configured and biased as a simple operational amplifier (opamp), one was placed in a common emitter type circuit and the remaining were biased to measure transistor parameter degradation. The purpose of this setup was to observe the total dose effects of ... |
|
| Amorphous Insulating Thin Films II. Proceedings of Symposium Held in Strasbourg, France on May 24-27, 1994 |
95 |
522 pages |
| Authors:
R. A. Devine; W. L. Warren; J. Kanicki; M. Matsumara; ELSEVIER SCIENCE PUBLISHERS LTD BARKING (UNITED KINGDOM)
|
| The contents of this volume of the Journal of Non-Crystalline Solids contains a large fraction of the papers presented at the symposium Amorphous Insulating Thin Films II' which took place in Strasbourg, France from 24 to 27 May 1994. The symposium was organized under the auspices of the European Materials Research Society and was a follow-up to one organized in the USA during the Fall 1992 meeting of the Materials ... |
|
| Low Dielectric Constant Insulators and Gold Metallization for GHz Multi- Chip Modules. Part 2 |
95 |
203 pages |
| Authors:
Paul Kohl; Sue A. Bidstrup; David Hertling; GEORGIA INST OF TECH ATLANTA
|
| The goal of this program is to investigate new dielectrics, metals and processes for the fabrication of multichip modules which hold the promise of exceptional electrical performance in the GHz region in addition to high yield and high reliability. The low dielectric constant insulators are being evaluated through the fabrication of in-situ test structures using noble metals. In the course of doing this evaluation, a simple process for gold or ... |
|
| Recommended Requirements and Procedures for Repair of Electronic Assemblies |
30 JUN 94 |
|
| Authors:
R. Cormack; NAVAL AIR WARFARE CENTER AIRCRAFT DIV LAKEHURST NJ
|
| This document presents a proposed set of requirements and procedures for the repair of electronics. It is intended to be used by organic military repair depots and contractor depots who are responsible for the repair of returned fleet hardware. The document is organized into two sections. The first part defines the requirements for the repair process and the repaired assembly. The second part of the document defines recommended procedures for ... |
|
| Thermomechanical Modeling of Irradiated Polymer Composites. |
1994 |
|
| Authors:
Shive K. Chaturvedi; Chen-Ping Chao; OHIO STATE UNIV COLUMBUS DEPT OF CIVIL ENGINEERING
|
| Thermoelastic models are presented to evaluate constitutive response of fiber-reinforced polymer composites subjected to irradiation and temperature exposure. These models are based upon thermodynamic considerations involving Helmholtz and Gibbs free energy functions, and micro-mechanical models involving Eshelby's modified approach. The proposed union between the energy functions and micro-mechanics provides a unifying framework that can deal with the potential property changes in fibers, matrix and a fiber-matrix interface. The results for ... |
|
| Fatigue Damage and Fracture Mechanism of Notched Woven Laminates. |
1994 |
|
| Authors:
Jiayu Xiao; Claude Bathias; RESERVED SOURCE
|
| Three E-glass/epoxy notched woven laminates were studied under tensile fatigue loading with a stress ratio of 0.1 and a frequency of 20 Hz. At a fixed ratio of maximum fatigue stress to ultimate tensile strength (0.5), the apparent secant stiffness changes with the cycle number were measured and the fatigue damage mechanism was investigated. The S-N curve and notched fatigue strength were determined. The results show that the normalized apparent ... |
|
| Failure of Braided Carbon/Epoxy Composites Under Biaxial Compression. |
1994 |
|
| Authors:
L. V. Smith; S. R. Swanson; UTAH UNIV SALT LAKE CITY DEPT OF MECHANICAL ENGINEERING
|
| Although textile composites have been studied for some time, experimental stiffness and failure data have been limited. This study presents the experimental results from compressive tests involving triaxially braided fibrous composite cylindrical specimens. The specimens consisted of four different braid architectures, and were loaded both uniaxially and biaxially. Predicting the failure of textile composites has received relatively little attention in the literature in comparison to the work that has been ... |
|
| Studies on Effectiveness of Electromagnetic Interference Shielding in Carbon Fiber Filled Polychloroprene Composites. |
1994 |
|
| Authors:
P. B. Jana; A. K. Mallick; INDIAN INST OF TECH KHARAGPUR
|
| The electromagnetic interference (EMI) shileding effectiveness (SE) and return loss (RL) of short carbon fiber filled polychloroprene composites, vulcanized by metal oxide and ethylene thiourea, have been studied in the two frequency ranges of 100 to 2000 MHz and 8 to 12 GHz with special reference to the effects of carbon fiber (CF) concentration, fiber aspect ratio, and composite thickness indicating that the loss was due to absorption (A). The ... |
|
| An Assessment of Expressions for the Apparent Thermal Conductivity of Cellular Materials. |
1994 |
|
| Authors:
P. G. Collishaw; J. R. G. Evans; BRUNEL UNIV UXBRIDGE (UNITED KINGDOM) DEPT OF MATERIALS TECHNOLOGY
|
| Diverse expressions for the thermal conductivity of cellular materials are reviewed. Most expressions address only the conductive contribution to heat transfer; some expressions also consider the radiative contribution. Convectioin is considered to be negligible for cell diameters less than 4 mm. The predicted results are compared with measured conductivities for materials ranging from fine-pore foams to coarse packaging materials. The dependencies of the predicted conductivities on the material parameters which ... |
|
| Acoustic Emission Data on Delayed Damage Processes in the Vicinity of Defects in Fibre-Reinforced Plastics. |
1994 |
|
| Authors:
A. P. Tishkin; G. N. Gubanova; A. M. Leksovski; V. E. Yudin; RESERVED SOURCE
|
| Analysis of the time intervals between acoustic emission (AE) signals in composites makes it possible to study defect mechanisms induced by stress transfer near the previoulsy arisen defect. Unidirectional carbon fiber-reinforced plastics (CFRP) with matrices of different plasticity have been investigated during tensile deformation. There is a characteristic delay time between the correlated appearance of defects. For these materials the time delay ranges from 50-500 us. In the model considered ... |
|
| Thermal Expansion of Gamma Irradiated Nylon 66 from 10 K to 340 K. |
1994 |
|
| Authors:
H. S. Jayanna; S. V. Subramanyam; INDIAN INST OF SCIENCE BANGALORE
|
|
| Fatigue Behaviour of Unnotched and Notched Woven Glass/Epoxy Laminates. |
1994 |
|
| Authors:
Jiayu Xiao; Claude Bathias; CONSERVATOIRE NATIONAL DES ARTS ET METIERS PARIS (FRANCE)
|
| Unnotched and notched rectangular specimens of three E-glass/epoxy woven laminates (two orthotropic and one quasi-isotropic) have been cycled, with a stress ratio of 0.1 and a frequency of 20 Hz, under load control at room temperature. The fatigue strengths for these laminates are determined. The influence of the hole and the stacking sequence on the fatigue behaviour have been studied. The results show that the unnotched and notched laminates have ... |
|
| TOF SIMS and XPS Study of the Interaction of Aminosilanised E-Glass Fibres With Epoxy Resins. Part I: Diglycidyl Ether of Bisphenol S. |
1994 |
|
| Authors:
D. Wang; F. R. Jones; SHEFFIELD UNIV (UNITED KINGDOM)
|
| The interaction between HAPS and the epoxy resin, DGEBS, with E-glass fibers has been studied by means of TOF SIMS and XPS. The contamination of the as-received, apparently non-silanised or non-coupled, E-glass fiber surface by a patchy monomolecular layer of HAPS has been demonstrated. Its influence on the chemisorption of an epoxy resin on to the fiber surface was also studied. After treatment of the non-coupled fiber with a fresh ... |
|
| Modelling of Stress Transfer in Fibre Composites. |
1994 |
|
| Authors:
F. J. Guild; C. Vlattas; C. Galiotis; QUEEN MARY COLL LONDON (UNITED KINGDOM) DEPT OF MATERIALS
|
| The finite element analysis method has been used to investigate stress transfer to a single Kevlar fiber embedded in epoxy resin. Results from the simulations have been compared with experimental results from the technique of Raman spectroscopy; this technique leads to direct measurement of fiber strain. The measured strain profiles can be converted to profiles of fiber strain and interfacial shear stress are directly comparable to the experimental values; the ... |
|
| Non-Linear Numerical Analysis of the Iosipescu Specimen for Composite Materials. |
1994 |
|
| Authors:
Henjen Ho; John Morton; Gary L. Farley; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIEN CE AND MECHANICS
|
| A non-linear elastic finite element analysis is presented of the Iosipescu shear specimen tested in the modified Wyoming fixture for unidirectional graphite/epoxy composites. It is shown that the non-linear effects due to specimen-to-fixture contact interactions and speciment geometry on the overall shear response are negligible. It is proposed that the tangential shear modulus should be used to characterize the shear resistance of composite materials with highly non-linear shear response. The ... |
|
| Weight Changes of the Fibre/Matrix Interface in GRP Panels Immersed in Hot Water. |
1994 |
|
| Authors:
Tohru Morii; Hiroyuki Hamada; Zen-Ichiro Maekawa; Toshio Tanimoto; Takahiro Hirano; RESERVED SOURCE
|
| The weight-change behaviour of the fiber/matrix interface in composite panels consisting of randomly orientated E-glass fiber continuous strand mat in unsaturated polyester has been studied. Two matrix resins of different filler content were used. GRP and plain resin specimens were immersed in hot water and the weight of the specimens was measured as a function of time. The weight changes were evaluated in terms of three parameters: apparent weight gain, ... |
|
| The Influence of Aggregated and Dispersed Textures on the Elastic Properties of Discontinuous-Fiber Composites. |
1994 |
|
| Authors:
R. F. Eduljee; R. L. McCullough; J. W. Gillespie Jr; DELAWARE UNIV NEWARK CENTER FOR COMPOSITE MATERIALS
|
| The elastic properties of short-fiber composites which exhibit fiber orientation distributions, are usually computed through an orientation averaging procedure conducted on the elastic properties of an equivalently loaded aligned-fiber composite. This type of 'aggregate' averaging scheme may be appropriate for materials of the sheet molding compound (SMC) type that exhibit the domain microstructure of an aggregate. However, this averaging scheme may not be applicable for 'dispersed' microstructures such as those ... |
|
| Phospham - A Stable Phosphorus-Rich Flame Retardant. |
1994 |
|
| Authors:
Edward D. Weil; Navin G. Patel; POLYTECHNIC UNIV BROOKLYN NY
|
|
| Degradation Kinetics of Polyaniline Base and Sulfonated Polyaniline. |
1994 |
|
| Authors:
Tsung-Chieh Tsai; D. Alan Tree; Martin S. High; OKLAHOMA STATE UNIV STILLWATER SCHOOL OF CHEMICAL ENGINEERING
|
|
| Improvements of the Peel Test for Adhesion Evaluation of Thin Metallic Films on Polymeric Substrates. |
1994 |
|
| Authors:
A. Hagemeyer; H. Hibst; J. Heitz; D. Bauerle; BASF A G LUDWIGSHAFEN AM RHEIN (GERMANY F R)
|
|
| Comparison of Some Butadiene-Based Impact Modifiers for Polycarbonate. |
1994 |
|
| Authors:
C. Cheng; N. Peduto; A. Hiltner; E. Baer; P. R. Soskey; CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE
|
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Reports by Keyword(s)
ELECTRICAL INSULATION
