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Carbon fiber thickness vs strength

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  • Carbon fiber thickness vs strength

    Builds - C-Killa - Speedsters - LithMTM - Talking Sticks - Pocket Rockets - Khanspires - Dayton RS Center - RS225/28A - Kairos - Adelphos - SEOS TD12X - Dayton 8 - Needles - 871S - eD6c - Overnight Sensations - Tritrix (ported) - Lineup F4 - Stentorians - The Cheapies - Tub Thumpers - Barbells - Tuba HT - Numerous subwoofers - probably missing a few...... :p

  • #2
    I have some experience making carbon and carbon kevlar motorcycle fairings. I say just do an overlay on wood. Carbon is very strong and stiff, but brittle. I can see your carbon panel failing at the speaker mounting holes as you hit a big bump. Just my opinion.

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    • #3
      Are you talking about making a carbon fibre panel that will actually support that massive Aura on it's own? or just an overlay on an MDF or wood panel? We've been making sub-panel practice pieces for the Solar Car at my school, and it's quite interesting to test it out in various ways.

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      • #4
        I have experience doing wet-layup over MDF for speaker enclosures.
        The epoxy or polyester resin (whatever is compatible with the mat or weave you choose) ends up sealing the MDF better than anything I've experienced and laying it up wet is going to bond the carbon to the MDF better than anything else.

        While the modulus of carbon fiber, depending on the weave, can rival 36 ksi steel, that's not to say you should forgo the MDF. It'd be the same as building an enclosure out of thin steel plate.

        By overlaying the carbon sheet over MDF you are actually creating a composite material that is going to have properties that are superior to either material by itself. The MDF gives you mass and compressive strength. Mass is especially important to subwoofers with a lot of energy. The carbon, applied to the outside provides the stiffness. It's like steel reinforced concrete.

        In my past I used one layer of a 3K twill weave over 3/4 MDF.
        I was shocked at how well it worked even before I had added the cabinet bracing.
        My unscientific "knock-test" sounded very good.

        Hope this helps.
        Greg

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        • #5
          Thanks djg. I was concerned about the same and would hate to spend $2-$300 on a piece and ruin it.

          Yes maestro, I wanted to suspend the driver from it. But my back up plan is a veneer sheet of cf over a board of Baltic birch, which I think will be the smarter and stronger choice.
          Builds - C-Killa - Speedsters - LithMTM - Talking Sticks - Pocket Rockets - Khanspires - Dayton RS Center - RS225/28A - Kairos - Adelphos - SEOS TD12X - Dayton 8 - Needles - 871S - eD6c - Overnight Sensations - Tritrix (ported) - Lineup F4 - Stentorians - The Cheapies - Tub Thumpers - Barbells - Tuba HT - Numerous subwoofers - probably missing a few...... :p

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          • #6
            Hmm Greg, I’ve done some fiberglass work in the past but never carbon fiber. And I was trying to steer clear of working with resins and epoxies but didn’t think about the effects if I bonded them together.

            Shoot. Something to consider.
            Builds - C-Killa - Speedsters - LithMTM - Talking Sticks - Pocket Rockets - Khanspires - Dayton RS Center - RS225/28A - Kairos - Adelphos - SEOS TD12X - Dayton 8 - Needles - 871S - eD6c - Overnight Sensations - Tritrix (ported) - Lineup F4 - Stentorians - The Cheapies - Tub Thumpers - Barbells - Tuba HT - Numerous subwoofers - probably missing a few...... :p

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            • #7
              If I remember the properties are different depending on the resin used. It is strong in thin layers but is very resonant. I have an acoustic guitar that is made out of it. http://www.rainsong.com/ If you are just going for the look a cheaper option might be a layer of carbon fiber over fiberglass.

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              • #8
                Originally posted by joeybutts View Post
                Hmm Greg, I’ve done some fiberglass work in the past but never carbon fiber. And I was trying to steer clear of working with resins and epoxies but didn’t think about the effects if I bonded them together..
                How have you done fiberglass without using a resin?

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                • #9
                  Builds - C-Killa - Speedsters - LithMTM - Talking Sticks - Pocket Rockets - Khanspires - Dayton RS Center - RS225/28A - Kairos - Adelphos - SEOS TD12X - Dayton 8 - Needles - 871S - eD6c - Overnight Sensations - Tritrix (ported) - Lineup F4 - Stentorians - The Cheapies - Tub Thumpers - Barbells - Tuba HT - Numerous subwoofers - probably missing a few...... :p

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                  • #10
                    Epoxy resin will definitely be stronger over polyester (fiberglass) resin in almost every situation when laminating cloth onto a substrate.

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                    • #11
                      Starting to think I may be doing some carbon fiber laying!!
                      Builds - C-Killa - Speedsters - LithMTM - Talking Sticks - Pocket Rockets - Khanspires - Dayton RS Center - RS225/28A - Kairos - Adelphos - SEOS TD12X - Dayton 8 - Needles - 871S - eD6c - Overnight Sensations - Tritrix (ported) - Lineup F4 - Stentorians - The Cheapies - Tub Thumpers - Barbells - Tuba HT - Numerous subwoofers - probably missing a few...... :p

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                      • #12
                        Originally posted by joeybutts View Post
                        Starting to think I may be doing some carbon fiber laying!!
                        ​Joey were you going for the strength of CF or do you want the look of CF. There are some products that you laminate like formica using contact cement that
                        ​are made from Carbon Fiber, that may be an easier process.

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                        • #13
                          Builds - C-Killa - Speedsters - LithMTM - Talking Sticks - Pocket Rockets - Khanspires - Dayton RS Center - RS225/28A - Kairos - Adelphos - SEOS TD12X - Dayton 8 - Needles - 871S - eD6c - Overnight Sensations - Tritrix (ported) - Lineup F4 - Stentorians - The Cheapies - Tub Thumpers - Barbells - Tuba HT - Numerous subwoofers - probably missing a few...... :p

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                          • #14
                            Originally posted by joeybutts View Post
                            Starting to think I may be doing some carbon fiber laying!!
                            A wet layup of carbon fiber cloth will never look as uniform as pre preg professionally done work. Also, the surface will not be glass smooth unless it is layed up on a sheet of glass. Sanding will totally destroy the beautiful cloth weave look you want. Believe me, using a manufactured sheet over wood is the way to go.

                            There are low odor epoxies available. I would consider using contact adhesive.

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                            • #15
                              Djg- I was gonna pick up three pieces of this-
                              And you can order it with adhesive applied. The cuts would end up basically hidden due to where they would land. I may be able to get away with two pieces.
                              Builds - C-Killa - Speedsters - LithMTM - Talking Sticks - Pocket Rockets - Khanspires - Dayton RS Center - RS225/28A - Kairos - Adelphos - SEOS TD12X - Dayton 8 - Needles - 871S - eD6c - Overnight Sensations - Tritrix (ported) - Lineup F4 - Stentorians - The Cheapies - Tub Thumpers - Barbells - Tuba HT - Numerous subwoofers - probably missing a few...... :p

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