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13 SKIS Building proces
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dvollebregt



Joined: 26 Jul 2013
Posts: 23

PostPosted: Wed Oct 04, 2017 9:05 am    Post subject: Reply with quote

So you suggest:

Flax 350
UD carbon
BCore
UD carbon
Flax 350
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skidesmond



Joined: 07 Apr 2009
Posts: 2277
Location: Western Mass, USA

PostPosted: Wed Oct 04, 2017 1:14 pm    Post subject: Reply with quote

Yes, that how I do it.
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SleepingAwake



Joined: 11 Oct 2010
Posts: 119

PostPosted: Thu Oct 05, 2017 1:22 am    Post subject: Reply with quote

I strongly disagree with that and I know of a few cases where this lead to problems. You generally try to have a smooth transition in stiffness in order to avoid shear stress on the interface. So always core to biax to UD.

If you want to have the UD against the core I would recommend putting a very light glass or polyester fleece in-between core and UD to give it a little bit of a tougher interface.

Furthermore you would want to change the core profile as well when you switch around layers like that.
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gav wa



Joined: 18 Feb 2014
Posts: 325
Location: Perth

PostPosted: Thu Oct 05, 2017 5:31 am    Post subject: Reply with quote

SleepingAwake wrote:
I strongly disagree with that and I know of a few cases where this lead to problems. You generally try to have a smooth transition in stiffness in order to avoid shear stress on the interface. So always core to biax to UD.

If you want to have the UD against the core I would recommend putting a very light glass or polyester fleece in-between core and UD to give it a little bit of a tougher interface.

Furthermore you would want to change the core profile as well when you switch around layers like that.


Do you think this applies to triax glass as well?
So don't have the 0 degree fibre against the core?
Wouldn't there always be a big differential against the UD layer?
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SleepingAwake



Joined: 11 Oct 2010
Posts: 119

PostPosted: Thu Oct 05, 2017 7:55 am    Post subject: Reply with quote

gav wa wrote:
SleepingAwake wrote:
I strongly disagree with that and I know of a few cases where this lead to problems. You generally try to have a smooth transition in stiffness in order to avoid shear stress on the interface. So always core to biax to UD.

If you want to have the UD against the core I would recommend putting a very light glass or polyester fleece in-between core and UD to give it a little bit of a tougher interface.

Furthermore you would want to change the core profile as well when you switch around layers like that.


Do you think this applies to triax glass as well?
So don't have the 0 degree fibre against the core?
Wouldn't there always be a big differential against the UD layer?

In theory this applies to fiberglass as well, but as your average carbon fiber is around 3 times stiffer than glass fiber the problem is less pronounced.
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gav wa



Joined: 18 Feb 2014
Posts: 325
Location: Perth

PostPosted: Fri Oct 06, 2017 7:47 am    Post subject: Reply with quote

Thanks for the info. I have been planning to make a set of foldable approach skis that aren't heavy and unreliable like mtn approach. I have some carbon ready to go but now i might add a bit of light glass between the core and carbon.
Cheers bro.
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