PrfctChaos wrote: ↑
Fri Jul 10, 2020 10:43 pm
fluidity wrote: ↑
Fri Jul 10, 2020 1:03 pm
PrfctChaos wrote: ↑
Fri Jul 10, 2020 8:28 am
How often do you see carbon layers delaminating from other carbon layers? I certainly don't.
I've seen it in kiteboards with double bias carbon cloth with strands pulling loose a long way.
Do you understand that the bond strength is massively stronger in the direction of the fibres than between the layers? Otherwise people would just paint their boards with epoxy resin only.
Do you understand that multilayer prepreg carbon objects like masts, wings etc hold up really well IN THE REAL WORLD. Same construction as the gong foil base being discussed.
You are clearly just getting started in the wonderfull world of epoxy based fabrication and overtheorising something that you will understand better later.
Difference between us is that I learn and pass on my knowlege. So far I only see you making unsupported claims.
So your claim that the construction of the Gong foilbase is the same as CF masts and wings, you'd actually have to compare prepreg CF sources, specifications, quality control measures in the prepreg factory , storage temperature profile in transit and on site and procedure in the assembly and autoclave processes. And even then you'd luck out because the shapes are very different, the stresses are very different and the core materials don't compare. A racing hydrofoil can be carbon only because it's span is high and it's chord is minimal. A wingsurf hydrofoil has a lot of thickness which is pointless to waste expensive composite materials on so any manufacturer will uses a lower costing core. A mast has peak loading on long curved surfaces at the extremes of inside and outside bend deflection. A Hydrofoil has smoother front to back loading but intense loading toward the centre. A foil base has shear forces between CF layers on front attachments points and compressive forces on rear of the flange on a foil ground impact.
A careful google shows innovations like this: https://www.compositesworld.com/article ... lamination
dated 10/21/2015, but uptake of new factory processes is dependent on tooling and supply, training.
As someone who's never used prepreg I can theorise that in a factory environment it's possible to mix batches of resin with high short fibre content and blend these totally into the prepreg fabric. However short fibre agregate tensile strength doesn't compare with long continous fibre strength. So forgive me for querying the delamination resistance of the Gong base!