+x

 

Amore - 8/24/2017 7:52:11 AM

+x

 

Fasta - 8/24/2017 6:09:29 AM

For  very light sandwich you can use PVC or acrylic foam core instead but without film glues and this could be lighter than any nomex or alloy honeycomb due to not using film glues.

when we cut off the monocoque body the rohacell is crushed and smashed so body compliance was serious problem

+x

 

Matt (Staff) - 8/24/2017 7:35:52 AM

+x

 

Amore - 8/24/2017 7:29:16 AM

+x

 

Matt (Staff) - 8/22/2017 10:33:57 AM

Yes, it would be fine to use the same adhesive film that you used for the aramid honeycomb with aluminium honeycomb. Make sure of course that the adhesive film has been stored frozen for the whole time since last year.I hope this helps.

thanks for your reply

but i have a question about aluminum honeycomb sandwich pannel

if aluminum is oxidized, is there no problem??

Do you mean that the honeycomb you have shows signs of oxidisation (showing as white corrosion on the foil)? - If this is the case then this will certainly cause some reduction in mechanical performance. Under normal conditions it's quite unusual for aluminum to corrode like this. Or are you referring to the possibility of galvanic corrosion once you have combined the aluminium and carbon fibre into the finished panel? - If this is what you mean then although galvanic corrosion is a consideration in high risk environments (such as helicopters subject to sea-spray) it is highly unlikely to be a problem in the environment (and service life) of a formula student car.

+x

 

Matt (Staff) - 8/24/2017 8:01:46 AM

+x

 

Amore - 8/24/2017 7:52:11 AM

+x

 

Fasta - 8/24/2017 6:09:29 AM

For  very light sandwich you can use PVC or acrylic foam core instead but without film glues and this could be lighter than any nomex or alloy honeycomb due to not using film glues.

when we cut off the monocoque body the rohacell is crushed and smashed so body compliance was serious problem

That sounds very unusual. I can't understand why the Rohacell would be crushed and smashed. Is this after an impact or just after fabrication? Also, if you're getting delamination between the prepreg and the Rohacell this is also a problem which shouldn't happen. However, if you're now set on a course of Aluminium honeycomb then it would be worth concentrating on making sure this goes correctly and that you do not run into the same delamination problems. If you do need adhesive film then we have our XA120 which has excellent bond strength to aluminium (and aramid) cores and is available from stock. It's not listed on the website yet but our sales team can help you if you need some.

+x

 

Matt (Staff) - 8/24/2017 8:01:46 AM

+x

 

Amore - 8/24/2017 7:52:11 AM

+x

 

Fasta - 8/24/2017 6:09:29 AM

For  very light sandwich you can use PVC or acrylic foam core instead but without film glues and this could be lighter than any nomex or alloy honeycomb due to not using film glues.

when we cut off the monocoque body the rohacell is crushed and smashed so body compliance was serious problem

That sounds very unusual. I can't understand why the Rohacell would be crushed and smashed. Is this after an impact or just after fabrication? Also, if you're getting delamination between the prepreg and the Rohacell this is also a problem which shouldn't happen. However, if you're now set on a course of Aluminium honeycomb then it would be worth concentrating on making sure this goes correctly and that you do not run into the same delamination problems. If you do need adhesive film then we have our XA120 which has excellent bond strength to aluminium (and aramid) cores and is available from stock. It's not listed on the website yet but our sales team can help you if you need some.

+x

 

Jan Christian - 8/31/2017 8:14:00 PM

Amore: What was the carbon fiber fabric weight and how many layers on each side of the 1/8 inch aramid fiber Honey comb did you use?