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composite-agency forum - www.composite-agency.com | Site profile
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user's latest post:
Graphene based Fusion Bonded...
Published (2009-11-05 21:37:00)
Dear all, Thanks for the case with the simulation of nano Graphene (a one-atom-thick planar sheet of sp2-bonded carbon atoms that are densely packed in a honeycomb crystal lattice) in Fusion Bonded Epoxy (FBE). It really seems that the suggested system is capable of dealing with interfacial strains and pressures resulting from hydrostatic, temperature and swelling. This might certainly change the game for Hydrogen and Carbon Dioxide transport...
user's latest post:
Graphene based Fusion Bonded...
Published (2009-11-08 18:34:00)
Interesting subject! The following I just found on the internet In general, graphene's carbon-network composition makes it highly conductive and its two-dimensional geometry gives it a high surface area (between 700 and 1700 m2/g for Vor-x⢠compared to 200 to 500 m2/g for CNTs, for example). In composites, this high surface area allows graphene to improve properties like conductivity, barrier, and strength and to reduce a...
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Top 10 active forums on composite-agency forum during last week:
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Top 10 forums on composite-agency forum :
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Latest active threads on composite-agency forum :
Started 1 week, 3 days ago (2009-11-05 21:37:00)
by Michel Junker
Dear all,
Thanks for the case with the simulation of Graphene 1 in Fusion Bonded Epoxy (FBE). It really seems that the suggested system is capable of dealing with interfacial strains and pressures resulting from hydrostatic pressure and temperature stress. This might certainly be a factor in the lifetime extension (being subjected to Hydrogen embrittlement / Hydrogen Induced Stress ...
Started 1 month ago (2009-10-13 18:10:00)
by composite agency
Dear Donald Green, Yes, buckling modes of multilayer structures (e.g. Polyethylene to Aluminum, Reinforced Epoxy plies, PU isolation on X65 high-strength steel, etc.) are included in IDC-SAC. In case of internal pressure, temperature variations and swelling strains, I assume that at this point you are - above all - interested in circumferential buckling phenomena. The determination and ...
Started 8 months, 2 weeks ago (2009-03-03 14:45:00)
by ritesh dewan
Hello, I want to add some analytical information concerning the diffusion coefficient of for example Carbon Dioxide (CO2), Carbonic Acid or Water Vapour in membrane (i.e. Polyimide, PDMS or Sulfonated PEEK), coating or fibre composite applications. There are number of analytical- experimental techniques which can be used to determine the diffusion coefficient through polymer interfaces. They ...
Started 1 month, 2 weeks ago (2009-09-26 21:24:00)
by composite agency
Jan, Thanks for the posting. Yes, methane gas will accumulate - due to the permeation through HDPE - in the annular space between HDPE and the old steel pipe (at least when the old steel pipe is tight - then the secondary diffusion due to steel layer will be much slower - this should be checked because the story that follows assumes old but still tight steel). You will need a continuous flow...
Started 2 months, 1 week ago (2009-09-07 14:36:00)
by composite agency
Dear Ed, Thanks for your interesting posting. SHIN-ETSU Sifel® is a rather specific sealant which stays flexible below - 50 degrees Celsius and is chemically resistant to Amine based oil additives. As a consequence of this low temperature applicability, the glass transition temperature is low - lower than -50 degrees Celsius - and therefore the free volume in the sealant will be ...
Started 1 month, 3 weeks ago (2009-09-22 11:04:00)
by composite agency
Dear Kurt, The diffusivity of Xylenes and Ethyl Benzene into LDPE and HDPE can be extracted from available reference data. Temperature dependency can be estimated using Arrhenius Law. Below we list some of the diffusvities. However, note that with regard to pollution of potable water pipelines, the thermodynamics (resulting in a certain solubility of the chemicals in the polymer, giving rise ...
Started 8 months, 2 weeks ago (2009-03-02 22:27:00)
by rodney
From the viewpoint of the CO2 pipeline material decision, supercritical CO2 transport is indeed the challenge of the current moment. Among others, the phenomenon of condensation of acid on the pipeline wall (indeed the solubility of water at the 100 bar is very low, hence in no circumstance carbonic acid formation will be prevented) will require at least an epoxy / vinyl ester based - or ...
Started 2 months, 2 weeks ago (2009-08-31 22:34:00)
by composite agency
Dear Shalom:
Probably Polytetrafluoroethylene (PTFE) based flexible is suitable. The permeability of 100% Acetone vapour in PTFE in ambient condtions is in the order of 1E-8 gram/m x s. Divide this figure by the wall thickness and multiply this figure with the total wall square to obtain the total mass flux per second.
Polyethylenes (PE's) could also be used but they have short life...
Started 3 months, 3 weeks ago (2009-07-24 08:43:00)
by holger
Nick, maybe the following is helpful: Titre du document / Document title: Horizontal cylinder-in-cylinder buckling under compression and torsion : Review and application to composite drill pipe Auteur(s) / Author(s): WICKS Nathan ; WARDLE Brian L. ; PAFITIS Demos ; Résumé / Abstract: Available analytical results and experiments on the structural behavior of constrained horizontal ...
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Hot threads for last week on composite-agency forum :
Started 1 week, 3 days ago (2009-11-05 21:37:00)
by Michel Junker
Dear all,
Thanks for the case with the simulation of Graphene 1 in Fusion Bonded Epoxy (FBE). It really seems that the suggested system is capable of dealing with interfacial strains and pressures resulting from hydrostatic pressure and temperature stress. This might certainly be a factor in the lifetime extension (being subjected to Hydrogen embrittlement / Hydrogen Induced Stress ...
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