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Hi IthonEng One company in UK I've used who's good with bladder moulding (e.g. propellers)is Rockwood Composite in Newton Abbot

Thanks for all your info

Hi SW, I have no particular customer requirement. I just want to find out how my composite material performance under thermal shock condition. I was thinking of plunging the test samples into a chamber set at, say -50C, leave for 5-10 minutes and move them to hot chamber, say 100C, leave for...

Hi SWComposites, I need to investigate if my composites are prone to matrix cracking or other failure mode when subject to thermal shock during flights.

Hi, Can anyone offer advice on the heating/cooling rate use in thermal spike testing of composites, for both civil and military applications??

Compositepro - what causes the increase in internal stresses and the brittleness? Swcomposites - is the reduction in the compression strength resulted from increase in the weaviness of ply due to heavier tow (i.e. 12K fibre)?? RPstress & all - what ifI use a combination of different gsm fabric...

What are the penalties for using higher gsm fabrics and are there any publications available on the internet. Thanks

Thank you all for your contributions

Gents, I have a PMMA screen of around 800mm x700mm and 6mm thick. If I were to scored the sheet 3mm deep of v shape grove and from one corner of the sheet to another in the form of X. If the sheet is then subjected to impulse pressure of @ 20KPa. Do you think the sheet will break into small...

Thanks for all your contributions. I guess the general opinions are analysis is difficult and inaccurate and best is to carry out appropriate testing. Thanks again

Thanks for the feedback gents, but what if I have to use the composite above its Tg, does the FE analysis result which generated from non linear test data is still appropriate?? may be I should look into FE analysis on elastomeric materials??

Has anyone has any experience in using composite material above its Tg. If one could characterise its mechanical properties (at temperature >Tg and ignoring non linear failure behaviour), can one use them for FE analysis i.e. does the FE result applicable or appropriate?? n/b: the component...

Have you consider glass fibre reinforced phenolics

Compositepro, do you think ILS determined from a flat laminate can be used to analyse a tube structure like a pipe? also if the pipe is subject to a bending load will there be any shear load in the NA of the pipe and how far off the ILS of the pipe from ILS determined from flat laminate?

Closest to pp is polyethylene - cheap and readily available

RPstress, as a matter of interent, you mentioned that the Tg of the cure laminate is much higher, then what is the % shrinkage estimated for from the TG to RT??

For typical properties like, tensile, compression and flexural, you should be able to find test methods readily. When I was doing me research, it was the old BS2787 Method 350D for tensile (you have to look up the update EN specs).I can't really remember the standard I used for compression, but...

No, I have not SWComposites. You're right about the prices are affected by the quantity but I'm not looking for abosolute cost value but general values that will allow cost comparison like those in the link provided by Demon3 except preferably of materials to my interest.

Thanks guys especially demon3. And MikeHalloran, since you reply "yes" any chance of providwe me the info??. I'm especially interested in the the cost for fibrees like M46J, M55J, IM7, T800, T300 and in both UD and fabric, and their prepregs. Merci beaucoup

Does anyone know any website with information on the cost of composite materials i.e fibres: glass/carbon/kevlar either in UD or fabric form, also their prepregs with different matrices (epoxy/cyanate ester) Thanks