Hello!

I have a question about  sandwich core technique.
That is...

For example,
If I use  two set of  5mm nomex honeycomb core(10mm thick in total) to  make a sandwich panel,
is it  as strong as  a single 10 mm nomex honecomb core panel?
the  double 5mm sandwich has reasonable strength?
or the double 5mm sandwich is easy to break?


actually,
I want to build a curved sandwich panel.
I tried a 10mm thick  nomex honeycomb core at first,
but the 10mm thick core was too strong to bend.

 I wonder that if I use  a 5mm core,then laminate,bend  and add one more 5mm honeycomb core.
I mean,,  the sandwich is   CFRP>honeycomb core(5mm)>CFRP>honeycomb core(5mm)>CFRP.
If this idea is O.K. I will be able to build thick and strong curved sandwich panels.


Any advice,
I would be happy.

Thanks,







 

>brainfart san,

Thanks for your advice!

>Warren san,
Thanks for assisting!


>Do you want to laminate an essentially flat...

I am going to use  a curved mold then I put CF and core  to the mold.
so  I think there is no problem.  

>The middle glass or carbon layer connecting the two honeycomb cores doesn't have to be thick and strong,
being in the middle of a sandwich it will not contribute much to the strength, it is pretty much dead weight but it is still required.

I see. that is very important information!


>Tell us more about your project and we can give you better advice.

O.K.    its a little shameful though...lol
To be honest, I want to build some wheelchairs.I am a wheelchair user.
My goal is that  to build some unique and relatively reasonable (cost or price)wheelchairs.
for example, more compact folding wheelchair , or more  sporty(which has agility) everyday wheel chair....
I know there are some CFRP wheelchair products in the world.but they are too large (my body is smaller than western people)and too expensive for me.
I feel CFRP wheelchairs on the market are something like HIGH END goods for rich people.
In reality those wheelchairs are lightweight but NOT handy to me(I test-rided the high-end CFRP wheelchair).

I tried to talk to professional CFRP parts supplier in Japan that supplies CFRP parts for Moto GP.
They say Its possible to build CFRP wheelchairs.but also say it will be very costly to　develop the CFRP wheelchair from scratch.
So I gave up to ask that supplier to develop the wheelchair at this point.
I decided to build some wheelchairs as proto-type  by myself.then if these proto-type are good,I might step to collect money and ask the pro to develop CFRP wheelchair.


Anyway
the problem right now is that  how to build up my first wheelchair in real world!
Here is my first original wheelchair that I imagine.



The most important part is legs  and spacer/frame.
They need to be enough strong. I simulated these parts a little.
then I notified that so many CF layers are needed if I build thin legs like these.
But I want to build this type of wheelchair because this is simple , a little compact  and maybe a little stylish.

I tried 10mm core but it was too stiff to bend. so I am going to try 5mm and 5mm core for legs(like image above).
but  if  this idea is not practical, I would  build a different type of wheelchair.



thanks for reading such a long sentence.