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Thread: carbon fiber strength

  1. #1
    Maximum Bitrate djXternal's Avatar
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    carbon fiber strength

    hey guys... i have a '99 mitsubishi eclipse, and the stock clearance is close to 5"... so needless to say it is very easy to scrape that front bumper of mine unless u are extremely careful

    well i thought of an idea that would help me with this, i could use one of those reverse warning sensors that you could put on the back of ur car to tell u how close you are to a wall when backing up, but mount under the front bumper... this way if anything comes close to the sensor i will know and be able to stop before that wicked SCRAAAAPE...

    I need to know if making a carbon fiber enclosure for this thing would be strong enough to withstand and scrapes or hitting from concrete incase my fott would slip or sumthin... haha

    any help as to how strong this stuff actually is would be great

  2. #2
    Maximum Bitrate EBFoxbat's Avatar
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    Yup it would be. If you scrape hard enough to damage the CF, you have bigger problems. The trick is how to mount the CF to your car... I think that would be the weak point... I can see a CF enclosure snapping off the car.

    Carbon Fiber, real carbon fiber (think NASA/DoD) is insane... it's like steel that's as light as plastic, it's also NASA/DoD expensive.
    ,./(0)3

    '04 Canyon 4x4 pickup

    [---PC on hold----working on external fiberglass "tool" box---]

  3. #3
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    Interesting IDEA. Carbon fiber is strong for its weight. A from impact with the ground would shread the housing to bits.

    I would get some nylon pieces and make a little box out of it.

    My good friends boss put little 1/4 inch pieces of nylon on the bottom part of the nose of his F40 for this very idea.

    Good luck.

  4. #4
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    Interesting ^^ I have seen moderate crashes of cars (with mostly carbon fibre body cladding) and the CF is the first to get mangled.

    There would be no advantage to using CF. CF is only good if you need it to be very light. With the size box you are talking about, you might as well make it out of steel

  5. #5
    Constant Bitrate StationRocket's Avatar
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    As is stated above carbon fiber is very strong(strong for it's weight that is), it is not however very abrasion resistant. That's why when a boat builder is going to use it it's often put on the inside of the boat or covered with something else. I see this as a problem for your application. I think the idea of using nylon or perhaps delrin is a good idea. Delrin is easier to machine but is much more expensive. If you want to make it the same way you would with carbon fiber there is a material called Dynel that is much more abrasion resistant.

    Jamestown distributors is a great place to get fiberglass, carbon, dynel or other things like that

    www.jamestowndistributors.com

    McMaster Carr has an amazing selection of stuff including delrin and nylon blocks though they can be expensive

    http://www.mcmaster.com

    online metals is another great place to get metals and plastics

    http://www.onlinemetals.com/

    good luck

  6. #6
    Maximum Bitrate djXternal's Avatar
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    well the main reason i was going with carbon fiber is because its stronger than fibeglass, yet still as easy.... anything that uses the same process as fiberglassing yet is strong enough for this project, or any other option that can be homemade for a decently cheap price would be great

  7. #7
    Low Bitrate djtrickee's Avatar
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    cf

    5"...?!?!? HA!! I wish i had 5 inches clearance.

    If you have never worked with carbon fiber before then you should look into other mediums. Its not easy for a novice.





    If you want to see the rest of my car clearance problems and some of the carbon work i have done check my link...

    My CBCC Car

  8. #8
    Constant Bitrate StationRocket's Avatar
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    Quote Originally Posted by djXternal
    well the main reason i was going with carbon fiber is because its stronger than fibeglass, yet still as easy.... anything that uses the same process as fiberglassing yet is strong enough for this project, or any other option that can be homemade for a decently cheap price would be great

    If you want to use the "fiberglassing" process I'd recomend you start with layers of plain fiberglass to build your box and then use a layer or two of dynel or kevlar for the outer couple layers to give it some abrasion resistance. If making it light weight is important to you you could replace the fiberglass with carbon fiber but understand that if you're not vacume bagging it the resin is going to weigh more than the glass or the carbon so the benifit isn't likley going to be too significant though the cost difference will.

    As for the kevlar, you probably noticed i didn't recomend it above even though it's more abrasion resistant than Dynel and much more than glass or carbon. I didn't because it is a total PITA to work with. For starters it's very difficult to cut. You need special sisiors (you can get them from Jamestown, see above link) any regular ones dull very quickly. Also you can't sand it. If you do it just gets all fuzzy. So to get a smooth finish you have to vacume bag or apply plastic wrap over it while it cures. For these reasons I'd go with the Dynel instead. Dynel's disadvantage is that it is heavy mostly because it really soaks up the resin. Also it's a little more difficult to work with than glass but not that much.

    I'll bet you could find a lot more info on this topic if you hit a boatbuilding forum, especially one for canoes or kayaks.

    Good Luck

  9. #9
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    Quote Originally Posted by djtrickee
    5"...?!?!? HA!! I wish i had 5 inches clearance.

    If you have never worked with carbon fiber before then you should look into other mediums. Its not easy for a novice.





    If you want to see the rest of my car clearance problems and some of the carbon work i have done check my link...

    My CBCC Car
    Dont mind me.... I'm just gonna drool over those pictures for a couple of hours!
    ----------------------
    VIA Epia II
    256MB 266DDR Ram
    90GB Wester Digital
    Bluetooth/Deluo GPS
    Lilliput 7" Touchscreen
    ----------------------
    Mazda 6 Carputter > Click Me!

  10. #10
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    hey djtrickee,

    where did u get that cf cover in your center console from?

    or did u make it?

    is it covering an lcd?


    thanks.
    2001 Acura CL traded for a 2006 Subaru Legacy GT
    7" Lilliput Touchscreen
    NANO-ITX+m1-atx
    512 DDRsodimm
    60g SATA Laptop HD
    4x Apple DVDslot
    digimoto OBDii
    mS GPS
    mini BT keyboard
    relocated HU faceplate

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