An analytic model is developed to investigate the influence of ply waviness on the stiffness and strength of composite laminates. The model predicts: elastic properties and thermal expansion coefficients of sublaminates containing wavy layers; ply stress for prescribed mechanical and thermal load cases; strength reduction associated with ply waviness. Parametric studies are conducted for sublaminates of AS4 Graphite/PEKK and S2 Glass/PEKK which exhibit layer waviness. Results show that...
Topics: DTIC Archive, Bogetti, Travis A, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *COMPOSITE...
Interpenetrating polymer network (IPN) materials possess unique properties that can be exploited for multicomponent composite armor systems, including toughness and thermal stability. E-beam curing of composites and adhesives offers advantages, such as reduced cure shrinkages, over traditional autoclave processing by curing multiple resins through the thickness for thick-section composites in a single step. Because of the complexity and thickness of composite integral armor structures, e-beam...
Topics: DTIC Archive, Jensen, Robert E, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS...
In an update to previous research, we have been increasing the fiber-volume fraction by Vacuum Assisted Resin Transfer Molding (VARTM) in order to produce composite structures with aerospace grade qualities. Of specific focus is the control of processing parameters during resin infusion to obtain fiber-volume fractions like those of autoclave processed composites. Using a combination of viscosity control, U.S. Army Research Laboratory (ARL) based VARTM techniques, and a pressure control system,...
Topics: DTIC Archive, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH...
New fabrication technologies are being exploited for building high graphite-fiber-reinforced composite structure. Stitched fiber preforms and resin film infusion have been successfully demonstrated for large, composite wing structures. Other automatic processes being developed include automated placement of tacky, drapable epoxy towpreg, automated heated head placement of consolidated ribbon/tape, and vacuum-assisted resin transfer molding. These methods have the potential to yield low cost...
Topics: NASA Technical Reports Server (NTRS), AUTOCLAVES, COMPOSITE STRUCTURES, EPOXY RESINS, FIBER...
xvii, 214 leaves : 29 cm
Topics: Autoclaves -- Computer simulation, Autoclaves -- Automatic control, Sulfate pulping process
A broad product line of bismaleimide modified epoxy adhesives which are cured by conventional addition curing methods is described. These products fill a market need for 232 C (450 F) service adhesives which are cured in a manner similar to conventional 177 C (350 F) epoxy adhesives. The products described include film adhesives, pastes, and a primer. Subsequent development work has resulted in a new bismaleimide modified epoxy resin which uses a unique addition curing mechanism. This has...
Topics: NASA Technical Reports Server (NTRS), ADHESIVES, CURING, EPOXY COMPOUNDS, EPOXY MATRIX COMPOSITES,...
Polyurethane-based aircraft coating degradation was examined using Diffuse Reflectance Infrared Fourier Transform spectroscopy (DRIFTs). Two sample sets were aged in an autoclave; each containing four samples. Sample set A contained two as-cured samples and two samples treated to a level of visual degradation. Sample set B contained one sample left as-cured and three samples of differing degradation. DRIFTs spectra were collected on sample set B and singular value decomposition (SVD) was used...
Topics: DTIC Archive, AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF...
High quality long fiber reinforced composites, such as those used in aerospace and industrial applications are commonly processed in autoclaves. An adequate resin flow model for the entire system (laminate/bleeder/ breather), which provides a description of the time-dependent laminate consolidation process, is useful in predicting the loss of resin, heat transfer characteristics, fiber volume fraction and part dimension, etc., under a specified set of processing conditions. This could be...
Topics: DTIC Archive, Hou, T. H., PRC KENTRON HAMPTON VA, *LAMINATES, *FIBER REINFORCED COMPOSITES,...
A poly(Diels-Alder) (PDA) resin approach was investigated as a means to achieve autoclavability of high temperature resistant resin/fiber composites under mild fabrication procedures. The results of the study were highly promising and program objectives were achieved. Low void content Type A-S graphite reinforced composites were autoclave fabricated from a PDA resin/fiber prepreg prepared from an acetone:methanol:dioxane varnish. Autoclave conditions were 477 deg K (400 deg F) and 0.7 MN/sq...
Topics: DTIC Archive, O'Rell, M. K., TRW SYSTEMS GROUP REDONDO BEACH CA, *POLYIMIDE RESINS, *AUTOCLAVES,...
The effect of autoclaving on torsional moment of two nickel titanium endodontic files. Aim To evaluate the effects of repeated autoclaving on torsional strength of two nickel titanium (NiTi) rotary endodontic files: Twisted Files (SybronEndo, Orange, CA, USA) and GT Series X files (Dentsply Tulsa Dental Specialties, Tulsa, OK, USA). Methodology Four groups of 20 GT Series X (size 20, .06 taper) and four groups of 20 Twisted Files (size 25, .06 taper) were subjected to 0, 1, 3 or 7 autoclave...
Topics: DTIC Archive, TINKER AFB OK, *AUTOCLAVES, *NICKEL ALLOYS, *TITANIUM ALLOYS, *TORSION, DENTISTRY,...
A PRSEUS test article was subjected to controlled impact on the skin face followed by static and cyclic axial compressions. Phased array ultrasonic inspection was conducted before impact, and after each of the test conditions. A linear phased array probe with a manual X-Y scanner was used for interrogation. Ultrasound showed a delamination between the skin and stringer flange adjacent to the impact. As designed, the stitching in the flange arrested the lateral flaw formation. Subsequent...
Topics: NASA Technical Reports Server (NTRS), PHASED ARRAYS, DELAMINATING, ULTRASONICS, LINEAR ARRAYS,...
Development of an advanced A-type polyimide, which can be used to produce autoclave molded, low-void content composites suitable for use at temperatures up to 316 C is reported. It consists of a mixture of methyl nadic anhydride, an 80:20 molar ratio of methylene dianaline and thiodianilene, and pyromellitic dianhydride.
Topics: NASA Technical Reports Server (NTRS), AUTOCLAVES, CHEMICAL REACTIONS, MOLECULAR STRUCTURE,...
This is a short presentation on the Composites work that has recently been performed in the Materials Science Divisionat Kennedy Space Center. Topics include Residual Stress, Repair, and Plant Habitat Growth Chamber Fabrication.
Topics: NASA Technical Reports Server (NTRS), COMPOSITE MATERIALS, RESIDUAL STRESS, PHYTOTRONS, COMPRESSION...
This paper presents autoclave temperature histories to cure thick- section composite cylinders with graphite fibers and thermoset resins. The two cylinders considered have wall thicknesses of 0.15 m and 0.3 m. The first objective is to achieve a consolidation period when the resin viscosity is everywhere relatively low for a reasonably long period of time. For the 0.15 m thickness cylinder, the viscosity drops below 15 Pa's for 4.1 hrs.; for the 0.3 m thickness cylinder, the viscosity drops...
Topics: DTIC Archive, Hjellming, L N, NATIONAL CENTER FOR COMPOSITE MATERIALS RESEARCH URBANA IL,...
This report studies chemical formulations that have demonstrated the capability of room temperature storability features having a minimum storage period demonstrated as six months. This report introduces resin systems that have met this requirement and have storage histories as long as five years without refrigeration or significant loss of mechanical properties. jg
Topics: DTIC Archive, May, Clayton A., MERLIN TECHNOLOGIES INC SAN CARLOS CA, *ROOM TEMPERATURE, *STORAGE,...
Hawthorne Army Ammunition Plant (HWAAP) covers some 246,000 acres of land situated in Mineral County approximately 135 miles southeast of Reno, Nevada, along U.S. Route 95. HWAAP was originally constructed in 1929 as a U.S. Navy Ammunition Depot (NAD). The Western Area Demilitarization Facility (WADF) was constructed by the Navy from 1975 to 1977 to dispose of Naval munitions in a controlled manner. The U.S. Army continued the Navy's munitions demilitarization program and assumed control of...
Topics: DTIC Archive, Watson, J. R., TENNESSEE VALLEY AUTHORITY MUSCLE SHOALS AL, *DECONTAMINATION, *ARMY...
The top face of a semi-infinite, plaster of paris slab was heated by forced convection in an autoclave while its depthwise temperature profile was obtained as a function of time by embedded thermocouples. The average forced convection heat transfer parameter of the slab's top face was determined from a time dependent lumped parameter analysis of temperature data acquired from two slug meters of varying design. the resulting nonlinear convective boundary conditions were applied to a transient...
Topics: DTIC Archive, Serabian, Steven M, ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB, *SCANNING,...
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venta y asesoramiento de maquinaria conservera de ocasion.
Topics: calderas, cerradoras, autoclaves, transportadores, llenadoras
Pitting and corrosion of surgical instruments during autoclave sterilization has been a problem for the past few years at USAF Hospital, Dyess AFB TX. The USAF Environmental Health Laboratory Kelly responded to an urgent request for analytical service in January 1975 to determine possible causes in the steam and boiler system. Field analysis indicates the problem was most likely to be free carbon dioxide in the steam lines from thermal decomposition of carbonates and bicarbonates found in the...
Topics: DTIC Archive, LeFebvre, Edward E., Britt, Samuel A., ENVIRONMENTAL HEALTH LAB KELLY AFB TX,...
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May 22, 2011
05/11
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Gleghorn, George; Veniaminov, Stanislav, et al; Asay, James; Atkinson, Dale; Flury, Walter; Johnson, Nicholas; Kessler, Donald; Knowles, Stephen; Rex, Dietrich; Toda, Susumu
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To acquire an unbiased technical assessment of (1) the research needed to better understand the debris environment, (2) the necessity and means of protecting spacecraft against the debris environment, and (3) potential methods of reducing the future debris hazard, NASA asked the National Research Council to form an international committee to examine the orbital debris issue. The committee was asked to draw upon available data and analyses to: characterize the current debris environment, project...
Topics: AIRCRAFT CONSTRUCTION MATERIALS, LOW COST, STIFFNESS, AUTOCLAVES, COMPOSITE MATERIALS, COMPOSITE...
The NASA Langley Research Center developed polyimide system, LaRC PETI-9, has successfully been processed into composites by high temperature vacuum assisted resin transfer molding (HT-VARTM). To extend the application of this high use temperature material to other out-of-autoclave (OOA) processing techniques, the fabrication of PETI- 9 laminates was evaluated using only a vacuum bag and oven cure. A LaRC PETI-9 polyimide solution in NMP was prepared and successfully utilized to fabricate...
Topics: NASA Technical Reports Server (NTRS), POLYIMIDES, COMPOSITE MATERIALS, RESIN TRANSFER MOLDING,...
Several liner assemblies were fabricated with Kevlar 49 and epoxy using various wet layup and prepreg processes. A production process, using prepreg material, was developed for fabricating the liner and a wet layup molding process was used to fabricate the Kevlar hat-shaped tunnels.
Topics: DTIC Archive, Schloman, A. H., BENDIX CORP KANSAS CITY MO KANSAS CITY DIV, *LAMINATES, *POLYAMIDE...
A phase 2 study has been initiated to investigate surfactant-assisted coal liquefaction, with the objective of quantifying the enhancement in liquid yields and product quality. This report covers the second quarter of work. The major accomplishments were: completion of coal liquefaction autoclave reactor runs with Illinois number 6 coal at processing temperatures of 300, 325, and 350 C, and pressures of 1800 psig; analysis of the filter cake and the filtrate obtained from the treated slurry in...
Topics: NASA Technical Reports Server (NTRS), COAL LIQUEFACTION, SCALE MODELS, SURFACTANTS, AUTOCLAVES,...
Adhesive bonding in the aerospace industry typically utilizes autoclaves or presses which have considerable thermal mass. As a consequence, the rates of heatup and cooldown of the bonded parts are limited and the total time and cost of the bonding process are often relatively high. Many of the adhesives themselves do not inherently require long processing times. Bonding could be performed rapidly if the heat was concentrated in the bond lines or at least in the adherends. Rapid Adhesive Bonding...
Topics: NASA Technical Reports Server (NTRS), ADHESIVE BONDING, AEROSPACE INDUSTRY, FIBER COMPOSITES,...
The effect of molecular weight on 343 C thermo-oxidative stability (TOS), mechanical properties, and processability, of the first generation PMR polyimides was studied. Graphite fiber reinforced PMR-15, PMR-30, PMR-50, and PMR-75 composites (corresponding to formulated molecular weights of 1500, 3000, 5000, and 7500, respectively) were fabricated using a simulated autoclave process. The data reveals that while alternate autoclave cure schedules are required for the high molecular weight resins,...
Topics: NASA Technical Reports Server (NTRS), FIBER COMPOSITES, GRAPHITE, LAMINATES, MOLECULAR WEIGHT,...
Efforts focused on the use of thermoplastic composite materials in the development of structural details associated with an advanced fighter fuselage section with applicability to transport design. In support of these designs, mechanics developments were conducted in two areas. First, a dissipative strain energy approach to material characterization and failure prediction, developed at the Naval Research Laboratory, was evaluated as a design/analysis tool. Second, a finite element formulation...
Topics: NASA Technical Reports Server (NTRS), AIRCRAFT STRUCTURES, COMPOSITE MATERIALS, COMPOSITE...
Several 1/16th-scale curved sandwich composite panel sections of a 10 m diameter barrel were fabricated to demonstrate the manufacturability of large-scale curved sections using minimum gauge, [+60/-60/0]s, toughened epoxy composite facesheets co-cured with low density (50 kilograms per cubic meters) aluminum honeycomb core. One of these panels was fabricated out of autoclave (OoA) by the vacuum bag oven (VBO) process using Cycom(Registered Trademark) T40-800b/5320-1 prepreg system while...
Topics: NASA Technical Reports Server (NTRS), COMPRESSIVE STRENGTH, CURVED PANELS, FABRICATION, RESIDUAL...
Procedures for(detoxification of the brevetoxins PbTx-2 and PbTx-3 were investigated using the Japanese madaka (Oryzias latipes) as the assay model. PbTx-2 was 100% lethal to these fish at concentrations above 70 ng/ml in the aquarium water, while PbTx-3 was less potent. Treatment with 0.5 ml 0.1 N naOH for 10 min detoxified a lethal dose of either PbTx-3 or PbTx-3 to below the detection limits of this assay (10 ng/ml). Decreasing NaOH concentration required correspondingly longer incubation...
Topics: DTIC Archive, Poli, Mark A, ARMY MEDICAL RESEARCH INST OF INFECTIOUS DISEASES FORT DETRICK MD,...
A key ingredient in the development of high performance composite and powder processed RST materials is the understanding of the processing/structure/property relationship. A vital part of this understanding is the independent control of material chemistry and processing coupled with the ability to exercise careful control of the temperature-time-pressure relationships during the consolidation of composite and powder processed structures. To this end, an equipment grant, requested for a high...
Topics: DTIC Archive, Koczak, Michael, DREXEL UNIV PHILADELPHIA PA DEPT OF MATERIALS ENGINEERING, *ALUMINUM...
Two acetylene functional Schiff's base pyropolymers have been evaluated as matrix materials for fiber reinforced composite materials. Autoclave processing techniques were developed to produce high quality laminated composites. These matrix resins can be made conductive through post-cure heat treatments and were studied in a conductivity range from 10-10 to 10 S/cm. The insulating resin composites have very stable mechanical properties up to 300 C; however, these properties are significantly...
Topics: DTIC Archive, Thoman, Steven J, NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW...
A dip and shoot analytical method was developed for the rapid sampling and desorption electrospray ionization mass spectrometric (DESI-MS) analysis of chemical warfare agents and their hydrolysis products in liquid samples. Sampling was performed by simply dipping fused silica, stainless steel or SPME tips into the organic or aqueous samples. Replicate analyses were completed within several minutes under ambient conditions with no sample pre-treatment, resulting in a significant increase in...
Topics: DTIC Archive, DEFENCE RESEARCH AND DEVELOPMENT SUFFIELD (ALBERTA), *HYDROLYSIS, *CHEMICAL WARFARE...
An analysis and a test program was conducted to investigate the damage tolerance of composite sandwich joints. The joints contained a single circular delamination between the face-sheet and the doubler. The coupons were fabricated through out-of-autoclave (OOA) processes, a technology NASA is investigating for joining large composite sections. The four-point bend flexure test was used to induce compression loading into the side of the joint where the delamination was placed. The compression...
Topics: NASA Technical Reports Server (NTRS), HEAVY LIFT LAUNCH VEHICLES, AUTOCLAVES, BONDED JOINTS,...
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Topics: Autoclaves, Sterilization, Bacteriology, Autoclaves, Stérilisation, Bactériologie
Chemistry and processing modifications of the poly(Diels Alder) polyimide (PDA) resin were performed to obtain structural composites suitable for 589K (600 deg F) service. This work demonstrated that the PDA resin formulation developed under Contract NAS 3-17770 is suitable for service at 589K (600 deg F) for up to 125 hours when used in combination with Hercules HTS graphite fiber. Sandwich panels were autoclave molded using PDA/HTS skins and polyimide/glass honeycomb core. Excellent adhesion...
Topics: DTIC Archive, Vaughan, R. W., TRW SYSTEMS GROUP REDONDO BEACH CA, *MOLDS(FORMS), *POLYIMIDE RESINS,...
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May 22, 2011
05/11
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The NASA Steering Committee for Surface Modeling and Grid Generation (SMAGG) sponsored a workshop on surface modeling, grid generation, and related issues in Computational Fluid Dynamics (CFD) solutions at Lewis Research Center, Cleveland, Ohio, May 9-11, 1995. The workshop provided a forum to identify industry needs, strengths, and weaknesses of the five grid technologies (patched structured, overset structured, Cartesian, unstructured, and hybrid), and to exchange thoughts about where each...
Topics: COMPOSITE STRUCTURES, DEGRADATION, FIBER STRENGTH, MECHANICAL PROPERTIES, COMPRESSIVE STRENGTH,...
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154
May 31, 2011
05/11
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Sauvageau, Donald R
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As part of the continuing effort to identify approaches to improve the safety and reliability of the Space Shuttle system, a Five-Segment Booster (FSB) design was conceptualized as a replacement for the current Space Shuttle boosters. The FSB offers a simple, unique approach to improve astronaut safety and increase performance margin. To determine the feasibility of the FSB, a Phase A study effort was sponsored by NASA and directed by the Marshall Space Flight Center. This study was initiated...
Topics: BOLTS, X-33 REUSABLE LAUNCH VEHICLE, DEBONDING (MATERIALS), DEFECTS, JOINTS (JUNCTIONS), SANDWICH...
Ten handpiece models were evaluated and compared under clinical conditions at the Branch Dental Clinic, Recruit Training Command, Great Lakes, IL. Handpieces were assigned to dentists in a randomized sequence. Dentists used each model for one week and subjectively evaluated its performance by completing a questionnaire. The handpieces were cleaned and lubricated according to the manufacturer's instructions and sterilized by steam autoclave following each use. A detailed record was kept for each...
Topics: DTIC Archive, Kuehne, J C, NAVAL DENTAL RESEARCH INST GREAT LAKES IL, *TEST AND EVALUATION,...
The investigation of the high temperature and pressure dissociation of water under irradiation was undertaken by the Power Pile Division of Oak Ridge National Laboratory in an effort to determine the degree of importance of the phenomenon with respect to the design of a high temperature water cooled power reactor. Theory and past experimentation indicate that net steady state dissociation is determined by the rates of the dissociation and recombination reactions under the imposed conditions,...
Topics: DTIC Archive, Fromm, L. W., OAK RIDGE Y-12 PLANT TN, *RECOMBINATION REACTIONS, *NUCLEAR REACTORS,...
An experimental test facility has been designed and constructed for investigation of the corrosion behavior of candidate materials in a supercritical water oxidation environment. The high temperatures (500 deg C) and high pressures (300 atm) required in this process, made the experimental apparatus construction and control a complex engineering problem. The facility consists of two systems. The first is an exposure autoclave internal volume 850 ml, with associated monitoring and control systems...
Topics: DTIC Archive, Orzalli, John C, MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF OCEAN ENGINEERING,...
This report summarizes and analyzes the issues relating to Plastic Encapsulated Microcircuit (PEM) Reliability. Included is: (1) discussion of current research efforts within the government and industry, (2) failure modes and mechanisms associated with PEMs, (3) test data on PEMs subjected to HAST, life test, Autoclave, high temperature storage, 85 deg C/85%RH tests, (4) field reliability data, (5) analysis of both test data and field data, (6) a reliability assessment model derived from the...
Topics: DTIC Archive, Denson, William, RELIABILITY ANALYSIS CENTER GRIFFISS AFB NY, *MICROCIRCUITS,...
Znl-xMgxO alloy formation via band gap engineering is important in the development of blue-UV optoelectronic devices by providing lattice-matched transparent substrates for ZnO and nitride-related devices. Zn1-Mgx0 alloy single crystals (Zn0.97MgO.030 and Zn0.945MgO.0550) have been successfully grown by the hydrothermal technique. The growth experiments were carried out at 650 c and 15-18 kpsi in alkaline solutions. Zn1-xMgxO alloy crystals were formed at pressures below _22 kpsi at the growth...
Topics: DTIC Archive, Callahan, Michael, AIR FORCE RESEARCH LAB HANSCOM AFB MA OPTOELECTRONIC TECHNOLOGY...
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Aug 29, 2018
08/18
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Ziegler, Johann Heinrich
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2 unnumbered pages, 68 pages, 2 leaves of plates : 22 cm (4to)
Topics: Papin, Denis, 1647-1714, Chemical apparatus -- Early works to 1800, Steam, Pressure vessels,...
Fabrication of composite structures using infusion processes such as resin transfer molding (RTM) and vacuum assisted resin transfer molding (VARTM) is generally more affordable than conventional autoclave techniques. Recent efforts have focused on adapting both technologies for the fabrication of high temperature (HT) resistant composites. Due to their low melt viscosity and long melt stability, certain phenylethynyl terminated imides (PETI) can be processed into composites using these high...
Topics: NASA Technical Reports Server (NTRS), COMPOSITE STRUCTURES, FABRICATION, RESIN TRANSFER MOLDING,...
This is the proceedings of the High Temperature Polymer Matrix Composites Conference held at the NASA Lewis Research Center on March 16-18, 1983. The purpose of the conference was to provide scientists and engineers working in the field of high temperature polymer matrix composites an opportunity to review, exchange, and assess the latest developments in this rapidly expanding area of materials technology. Technical papers were presented in the following areas: (1) Matrix Development; (2)...
Topics: DTIC Archive, NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER,...
Two highly promising approaches to yield autoclavable addition-type polyimides were identified and evaluated in the program. Conditions were established for autoclave preparation of Hercules HMS graphite fiber reinforced composites in the temperature range of 473 deg K (390 deg F) to 505 deg K (450 deg F) under an applied pressure of 0.7 MN/sq m (100 psi) for time durations up to four hours. Upon oven postcure in air at 589 deg K (600 deg K), composite samples demonstrated high mechanical...
Topics: DTIC Archive, Jones, R. J., TRW SYSTEMS GROUP REDONDO BEACH CA, *ADDITION REACTIONS, *POLYIMIDE...
Current methods for the disposal of munitions containing cast explosives (TNT, Comp B, and Tritonal) includes Open Burn/Open Detonation (OB/OD), steam out, wash out and contour drilling. Environmental concerns associated with above methods include air and ground contamination and waste stream treatment. Volume, concentration and toxicity variables have a direct correlation to the economics of disposal. Autoclave meltout is a demilitarization method that reduces the volume of the waste stream,...
Topics: DTIC Archive, TOOELE ARMY DEPOT UT AMMUNITION EQUIPMENT DIRECTORATE, *ORDNANCE DISPOSAL TOOLS,...
As the size of aerospace composite parts exceeds that of even the largest autoclaves, the development of new out-of-autoclave processes and materials is necessary to ensure quality and performance. Many out-of-autoclave prepreg systems can produce high-quality composites initially; however, due to long layup times, the resin advancement commonly causes high void content and variations in fiber volume. Applied Poleramic, Inc. (API), developed an aerospace-grade benzoxazine matrix composite...
Topics: NASA Technical Reports Server (NTRS), COMPOSITE MATERIALS, PREPREGS, MATRIX MATERIALS, EPOXY MATRIX...
This program was directed to the hydrothermal crystal growth of the nonlinear optical material potassium titanyl arsenate, KTiOAsO4. The solubility and phase relations were investigated for selected K/As ratios in KH2 AsO4 -KOH solutions over a temperature range of 300-600 deg C and 10,000-30,000 psi. The P-V-T data were generated and extrapolated for use in gold liners and Rene' 41 autoclaves with a pressure balancing method. All data were transferred to 1.5 inch diameter x 18 inch long...
Topics: DTIC Archive, Belt, Roger F., LITTON SYSTEMS INC MORRIS PLAINS NJ AIRTRON DIV, *SINGLE CRYSTALS,...
Improved thermally stable laminating resins have been developed based on the addition-type pyrolytic polymerization. Detailed monomer and polymer synthesis and characterization studies have identified formulations which facilitate press molding processing and autoclave fabrication of glass and graphite fiber reinforced composites. A specific resin formulation, termed PlOP was utilized to prepare a Courtaulds HMS reinforced simulated air foil demonstration part by an autoclave molding process.
Topics: DTIC Archive, Jones, R. J., TRW SYSTEMS GROUP REDONDO BEACH CA, *LAMINATES, *THERMAL STABILITY,...
The University of Delaware conducted a five-year multi disciplinary program in the manufacturing science of polymeric composites. The research effort was coordinated through five major thrust areas. The Advanced Autoclave Molding area addressed issues of batch-wise in-process monitoring and computer-integrated models; emphasis was placed on coupling reaction chemistry and process control to the mechanical performance of thick-section composites. Textile Pre forming/Resin Transfer Molding...
Topics: DTIC Archive, Chou, T. W., DELAWARE UNIV NEWARK CENTER FOR COMPOSITE MATERIALS, *COMPUTER PROGRAMS,...
