de Witchcraft » 28/01/2010 09:54
Hello everyone,
I'm sorry I do not speak French so I´ll post in english:
We have worked with Dyneema over 15 years and give up to 2 years garantee and most people who come to us for the HDD or XHDD constructions in Dyneema are generally not the most gentle sailors........ Initially there were problems with delamination, but at the time we have tested various methods to improve adherence and found ways to make it stick very good. Almost as good as glass. The solution was something we found by accident and not something any composite engineers would have thought of. The difference is when the test the bond is that you can delaminate Dyneema, because it does not break and the glass breaks because the material is weaker than the adhesion. Indeed Dyneema is not the best material for high compression loads, but the areas under high compression in a board are limited and can be reinforced. Other properties of Dyneema are so good that it leaves enough room to solve the lesser properties and still come up with a much stronger board.
Of course, after hitting the same spot several times with a hammer, it delaminates but mostly because the resin and the glass is weaker than Dyneema it is therefore the material that holds everything together. And repairs are always much easier with a little heat, it is easy to push an injection needle through the laminate and inject a little resin to bond it back, and then replace the outer layer of broken glass, which is necessary to finish the board because you can not sand Dyneema. But even after various hard impacts in the same place, you can continue sailing without water entering the board, to be sure you can seal it with some superglue. And the dents caused by the hammer in the video can often be heated out as the sandwich material we use has memory and returns to it´s original shape over 80 ° C.
Salut,
Bouke
Dernière édition par
Witchcraft le 28/01/2010 20:12, édité 2 fois.