+x

 

Hanaldo - 9/14/2020 2:16:37 PM

+x

 

Massimiliano - 9/14/2020 12:59:31 PM

+x

 

DD-Compound - 9/12/2020 5:52:09 AM

For the core you can bond 2x10mm together but take care it’s bonded proper, otherwise it will delaminate at neutral axis and you will loose stiffness and make sure the holes are not closed, otherwise your infusion will fail. 

Hi, can you recommend best way to bond PVC foam sheets?
Would micro fibers thickened epoxy do?

(About holes: I will perforate after the bonding, so no problem about closed holes)

Thickened epoxy is fine. It is critical to completely cover both surfaces so you have no voids. And then you need to press the sheets together with a very even pressure - vacuum is the easiest way to achieve this. 

+x

 

Massimiliano - 9/14/2020 12:59:31 PM

+x

 

DD-Compound - 9/12/2020 5:52:09 AM

For the core you can bond 2x10mm together but take care it’s bonded proper, otherwise it will delaminate at neutral axis and you will loose stiffness and make sure the holes are not closed, otherwise your infusion will fail. 

Hi, can you recommend best way to bond PVC foam sheets?
Would micro fibers thickened epoxy do?

(About holes: I will perforate after the bonding, so no problem about closed holes)

+x

 

DD-Compound - 9/12/2020 5:52:09 AM

For the core you can bond 2x10mm together but take care it’s bonded proper, otherwise it will delaminate at neutral axis and you will loose stiffness and make sure the holes are not closed, otherwise your infusion will fail. 

+x

 

Massimiliano - 9/12/2020 6:47:08 AM

+x

 

DD-Compound - 9/12/2020 5:52:09 AM

You can say roughly 1000g/m2 per mm. We mostly use a 1000g quadraxial two layers each side. That is a laminate that suits to a lot of scenarios.If you can’t get that use maybe 4 layers of 600g Biax (yes that would be little thicker and heavier but it’s a boat not a airplane)It is important to make it 0/90/+-45 to get a quasi isotroph laminate.Also take care on symmetry, otherwise your platform can be twisted badly. For the core you can bond 2x10mm together but take care it’s bonded proper, otherwise it will delaminate at neutral axis and you will loose stiffness and make sure the holes are not closed, otherwise your infusion will fail.At that swim Plattform I would go thicker that 20mm and would not put a waffle at the bottom. Then better go to 50mm thickness for stiffness and you are safe. For twist you can add some UD layers but I don’t think that’s needed.

Thank you DD-Compound!
I am not able to source any quadriaxal carbon from my suppliers, can a biaxial +/-45° alternated with a twill do the same job?

+x

 

DD-Compound - 9/12/2020 5:52:09 AM

You can say roughly 1000g/m2 per mm. We mostly use a 1000g quadraxial two layers each side. That is a laminate that suits to a lot of scenarios.If you can’t get that use maybe 4 layers of 600g Biax (yes that would be little thicker and heavier but it’s a boat not a airplane)It is important to make it 0/90/+-45 to get a quasi isotroph laminate.Also take care on symmetry, otherwise your platform can be twisted badly. For the core you can bond 2x10mm together but take care it’s bonded proper, otherwise it will delaminate at neutral axis and you will loose stiffness and make sure the holes are not closed, otherwise your infusion will fail.At that swim Plattform I would go thicker that 20mm and would not put a waffle at the bottom. Then better go to 50mm thickness for stiffness and you are safe. For twist you can add some UD layers but I don’t think that’s needed.

+x

 

Massimiliano - 9/9/2020 12:01:26 PM

+x

 

Rosta Spicl - 9/9/2020 11:52:45 AM

See the waffle. That's generally a pan, supported by lattice structure from the bottom side - it means bottom area of pan filled by crossing ribs fixed to the side flanges of pan. Understand?
Remember, from the rigidity point of view the height of ribs is the much more important than rib width.

Thank you, understand!
You got me hungry too :-)

+x

 

Rosta Spicl - 9/9/2020 11:52:45 AM

See the waffle. That's generally a pan, supported by lattice structure from the bottom side - it means bottom area of pan filled by crossing ribs fixed to the side flanges of pan. Understand?
Remember, from the rigidity point of view the height of ribs is the much more important than rib width.