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Not sure..! Kevlar + Epoxy on stress areas.

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Old 12-15-2005, 07:25 PM
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Default Not sure..! Kevlar + Epoxy on stress areas.

A question for u FRP Gurus out there... If Aramid Kevlar is laid on the inside of high stress areas ...at Keel and at Chines using epoxy....intsead of alternating combi mat with isopthalic ployester resin ...considering that the constuction of the boat is a Sandwich type using End Grain Balsa ..but at Chines and at Keel not having any core therefore having to add extra layers of solid glass in the above mentioned stress areas for added strength ... can anyone tell me if it is possible that one uses Kevlar combined with epoxy on the inside of the boat .... the other layers are of combi mat 18/10 using isopthalic resin...which are the outer and inner skins of the core where they practically meet as explained before as no core is present where i would like to increase layers ! ! ! due to the fact that Kevlar is 4.8oz in weight only nearly 4 times lighter ..layer to layer. ! ! ! hope i didnt mix u up .... ! ! ! hope u can answermy queastion....
CAN I DO IT YES OR NO ! ! !
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Old 12-15-2005, 07:44 PM
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Default Re: Not sure..! Kevlar + Epoxy on stress areas.

Kevlar has good tensile strength but like zero on the compression side (Like pushing with a rope) My suggestion is "S" Glass nearly the tensil of Kevlar and stiffness approaching carbon fiber..without the britleness elongation in the high 4% range..as for the resin system Vinyl Esters have roughly twice the tensil of polyesters..

Epoxys remember they have no chemical interaction at the interface so a mechanical anchor pattern has to be established IE sanding/scotch brite/grinding take your pick
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Old 12-15-2005, 08:52 PM
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Thumbs up Re: Not sure..! Kevlar + Epoxy on stress areas.

Quote:
Originally Posted by Steve 1
Kevlar has good tensile strength but like zero on the compression side (Like pushing with a rope) My suggestion is "S" Glass nearly the tensil of Kevlar and stiffness approaching carbon fiber..without the britleness elongation in the high 4% range..as for the resin system Vinyl Esters have roughly twice the tensil of polyesters..

Epoxys remember they have no chemical interaction at the interface so a mechanical anchor pattern has to be established IE sanding/scotch brite/grinding take your pick
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Old 12-15-2005, 09:04 PM
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Default Re: Not sure..! Kevlar + Epoxy on stress areas.

Thanks Tim!
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