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Hi , In reverse - Neubaten - no its not a pre-preg application . RPStress - Thanks for the response . We are aware of the challenge of creating laminates with defined levels of porosity in them . We are not trying to open up the allowable so that we can manufacture to a lesser standard . We...

Hi All , We are currently preparing a justification to support an increase in the NDI porosity design allowable of monolithic and sandwich CFRP laminates . Part of the justification revolves around a mechanical testing regime of samples that contain a higher level of porosity that seeks to...

Hi All , Whilst I have an understanding of the use of mould releases and the process requirements when curing thermosetting expoxy composites , I am less sure of the issues surrounding the manufacture of preforms . The carbon fibre we are using to fabricate RTM preforms is coated with a...

Hi all , Does anyone have any experience of automated CAD ply profiling dry fabrics ? I am currently doing some investigations into the issue and am having trouble maintaining the profiles as they are quite delicate . Does anyone have any knowledge of possible stabilisation films that may be...

Morning All , I was wondering if anyone had any experience of fabricating aerospace structural compoistes by RFI ( actually a type of VARTM ). This is a departure for us from traditional pre-preg manufacture and I was wondering how the environmental requirments ( clean room / environmentally...

Thank you for your advice gentlemen . I do suspect the bagging of the job . I will investigate this further with your comments in mind . Cheers

Hi All , I've got a major problem bonding anodised aluminium plates together to form a tensile lap shear specimen . The film adhesive used is Redux 308 NA and my problem is that the failed bond looks exceptionally porous . There are large voids within the glue line , possibly up to a couple of...

Another standard acid digestion method is to use conc sulphuric acid ( 98% ) heated to about 160 Deg C . ( You'll need a good fume cabinet ) . Upon reaching this temperature SLOWLY pippette into the mix 10 mls of 100 vols Hydrogen Peroxide ( This is very volatile so take care )until a clear...

Evening Forum , Can anyone suggest processing factors that may yield lower than expected ILSS test scores for CFRP laminates . The laminates are usually aproximately 8 plies thick with a nominal thickness of 2mm . The fabric is usually woven with the 0 Deg direction aligned in the same...