Talk Composites - The Forum for Advanced Composites

strengths and relevance

http://www.talkcomposites.com/Topic10295.aspx

By coleio - 3/17/2014 12:13:38 PM



some of you have probably seen me floating about the forum, asking silly noob questions so heres another one for you.
i recently found a page that compared strength of carbon and kevlar

as far as i can remember it was on two planes, rigidity and flex. or something to that effect anyhow. i cant find the page but it stated that kevlar was about 20percent less rigid but much much better when it came to  breaking points and flex.

so, after reading this and thinking about it for a while, taking costs into account i thought of removing carbon from the equation and going for a combination of kevlar and fibreglass. looking into it a bit more i came across this page which goes into much more detail than the first i came across

http://www.performance-composites.com/carbonfibre/mechanicalproperties_2.asp

so my question here is how much of these details are really relevant? i was going to look each one up but thought id ask here first.

i know that with the use of kevlar, woven fibreglass and a good core material like soric sf2 i can make a product better than many aftermarket cf panels. is my thinking wrong here? Bear in mind there are some atrociously poor quality carbon panels out there

oh, the application is car panels by the way, bonnets, bumpers etc...

thanks guys
  
By ChrisR - 3/17/2014 4:16:43 PM

depending on the part, resin, end use etc, you could infuse the outer layer to get your finish then wet lay & vac bag the rest using black pigmented resin with a layer of veil on the back. You won't get any of the core showing through and it will give a nice unform finish to the B side