Carbon Fiber Fabrication | Strength Testing

today we are going to be doing some strength testing on carbon fiber i did a video awhile back that was a flat panel and it had some flexibility I got a lot of comments asking about that flexibility In my personal opinion it was so flexible is because it was one dimentional It was only three or four layer of lightweight carbon fiber So today I am going to take 4 layers of 5.7 oz twill weave carbon fiber I am going to create three section…all with the same amount of layers of carbon fiber alright its nice and hard…with a little bit of flex most people carbon fiber shouldn’t have any flex to it if it was brittle it would be fiberglass thats part of what makes carbon fiber strong Im going to cut this thing into three pieces four layers carbon fiber four layers carbon fiber, two layers on top and two layers on the bottom with 1/2 inch foam in-between same thing here with a piece of 1 inch foam. and then we will test the strength of it alright I have the one piece cut into three let me show you the difference in strength no foam just flat carbon fiber see the flex? it should flex like that same four layers of carbon fiber with a piece of 1/2 inch foam in the middle nothing! just a little bit of flex im gonna take this weight…its 25 lbs you can see it flex just a little bit gonna move up to maybe an inch of foam in-between the same four layers of carbon fiber less! see how ridged that is? 25lbs im even gonna push on it…nothing you want to make carbon fiber strong…give it some dimension the difference in weight between this on and this one is so little you cant tell with that hand BE SURE TO SUBSCRIBE

100 Replies to “Carbon Fiber Fabrication | Strength Testing”

  1. Hi! Great Video! Well done!

    I have only an advice for you (and others who want to jump into composite building). I'm and aerospace engineer, who is specialized on composite design. The gloves you are using while you distribute the resin are not for resin made. Latex gloves like these unfortunately don't protect you from resin getting into your skin. You should look for gloves made out of nitril.

    If you want more information about that topic or if you have some certain questions, feel free to message me. 

    Again, great video! 
    Best regards from Germany!

  2. How thick can you go with the foam or how thick would you go before getting less strength or stiffness? Is there a ratio or guideline?

  3. hi! Great video! .
    you are video is great and l like it .if you can help me i research about videos that shows testing for carbon fiber beams for civil engineering . if you have links about this i will thank you much .
    Good job man .

  4. Fab Forums, I hope you can take some constructive criticism, you can do much better than this with the tools you have.
    Take a look at this video series and compare the quality you are getting to theirs.

  5. @The Fab Forums 
    Hey man. Question. Say I want to make a guitar. problem with wooden guitars is warping. Problem With me doing a carbon fiber guitar myself, is shaping it. Getting it the right thickness to route and hold pickups. Say I make a foam model of the guitar with the holes I need routed already and overlay carbon fiber on the body and nooks. Would that give me enough strength to hold about 5lbs of continuous string tension while letting me use less materials. Also, if I wrap That around a wooden guitar, would that guitar not warp? Thank you for your input. I've been driving myself crazy trying to figure out how I can make this work.

  6. Outstanding, thanks for the knowledge. What kind of tape are you using there to keep the fray at bay when cutting? Looks great for straight edges. I have used a sewing machine in the past to stitch complex patterns out before cutting on smaller pieces; it's hell on the needles.

  7. Great video!!! I'm currently in the process of making some parts for my car, now i have a better idea of what to use for my splitter.

  8. The resin system has a lot to do with how brittle a part is… not so much the fibers inside. I work with carbon, zylon, kevlar, and glass everyday on racing and aerospace parts… You are correct in that the structure plays the biggest role in rigidity. The resin formulation also plays a major role. Check out Cytec website for more information. Cool video showing the importance of core.

  9. Awesome demo! Maybe increase weight on part until fail and see just how many lbs it can take!? STAND on it? Put car on it? Keep up great work! Watchin!

  10. How necessary step it is to suck the extra resin off from the carbon fiber? I`m planing on doing some cf parts for my car so do I need to do that step to each part? Even if they are some complex shapes. Great video. I would really appreciate some hints. Thanks!

  11. This is because the strength of a rectangular cross-section is related to its area moment of inertia I_x = (1/12)*width * height ^3, so the higher it is, the more exponentially stiffer it is. This is the point of an I beam, which is to remove as much width as possible without the member buckling, and to use that material in height.

  12. It's called second area moment of inertia. Not what I was hoping for when I read the title. Strength test implies that you test for maximum strength till the sample breaks.

  13. This is why the aerospace industry use honeycomb filler. It makes it super strong but light weight. Hell they even use it in making cardboard boxes.

    Great demonstration..

  14. I've been thinking about a small motorcycle pull behind camper. Using the thinner foam in this video (what kind was it?) how weatherproof would it be?


  15. It's excellent! I am making a boat with foam, I want to coat it with carbon fiber because it seems it is make it super strong! Can you please add text on this video that what is the black sheet that you put carbon fiber on at first? what was that liquid you spread on the black sheet and put carbon fiber on? and more steps?


  16. The orientation of the weave also has a lot to do with its rigidity. if you do overlapping opposing weaves you'll get a much more rigid piece using less layers and less reinforcement.

  17. THAT was helpful! I'm looking at fabricating carbon fiber panniers for my motorcycle. I've seen it done in pictures and a few videos. The guy used cardboard for the honeycomb design and now I see why it works. Thanks!

  18. I waited for sledgehammer test with dumbell at the end to see flexy one will flex how about the rigid ones

  19. What's happening here has nothing to do with the material really. It's the separation of the two stressed surfaces that creates the rigidity. The greater the separation the greater the strength will be. You can put lots of different materials between the layers. Polycarbonate honeycombe is used in racing applications because it's rigid, very light and it doesn't absorb resin.

  20. Hey its me again The CarbonGuy! do another drill for me and you find this extremely useful when thickness and strength are both issues. instead of cutting all your fabric in the same direction for all four pieces, alter your direction of the warp face. Another words cut one piece the way you previously cut the four then cut another at a 45 degree from your first cut then cut another at a -45 degree then cut the 4th piece at a 90 degree angle from the 1st piece. now wet them out and lay them in that exact order. Let it cure and then do the same strength test, I think you will be shocked. But use cation to lay them out in the order as I explained or your part will curl up a bit after it cures! LOL but mix it up and play around to see for yourself what happens. kinda cool to learn about the warped face and how to manipulate it!

  21. dude cant wait to get my first car and work on carbon fiber going nuts i want to get my car and work on it 😁 will be having questions once i get my 370z soon and learn how to work and make parts with carbon fiber

  22. I am starting to use Carbon Fiber to make high power rockets so I love these videos! One question, would you get more strength by cutting the alternate layers on a bias so that the weave would run at different angles? The plan I am going to attempt for an airframe is 1 CF running 0-90, 1 CF running -45 – 45, 1 layer of nomex honeycomb, another layer of CF running -45-45 and finally a last layer of CF running 0-90. Would that lay up be any stronger or am I making more work for myself?

  23. No! Carbon Fibre doesn't flex and disintegrates on impact, just ask anybody at any car or plane forum …


  24. it seems that the comment went up with some typos…. ordinary ploy urethane foam, can it be used a sandwich core material?

  25. Brilliant. Just as I suspected. Thank you for posting this. Very appreciated. This helps me understand how to better work on my own project. Large panels with re-inforcement in surface contours.

  26. Well this was crazy. so wrapping a wooden core with carbon fiber for strength… but the wooden core is unnecessary for the real strength. hmm I think the project is still ago.

  27. Could this technique be used as a 'rib' method for body panels to give them strength?

    Can this also be used to make a chassis or is chassis fabing too elaborate and calls for big machines and astronomical funding?

  28. This method is great for parts where dimensions don't need to be accurate but this is actually a positive mold of that side of the heat shield. The dimensions wouldn't be the same. Doing this for dimension critical parts such as a bracket of interior panels there would need to be a mold for both sides.

  29. Look into doing counter biased weave layers. so your first layer would be 45 degrees weave and the next would be 90 degrees, then 45 then 90…. for as many layers as you lay. much more rigid and much stronger.

  30. thickness in the direction of bending looks like the key, and a shape that wont buckle. tubes resist torsion well. in bending the outside surface is under max tension (like the outside of a track) and inside under max compression. Why some bridges are metal on bottom and concrete on top.

  31. Fabric Stiffness Tester, to determine the bending height, flexural rigidity and bending modulus of a fabric by simple procedures and calculation. Welcome to click at

  32. huh, this must be how they make Intershelter dome homes. They disassemble and are light weight, bullet proof and fire proof.

  33. Thanks for posting this. I've been trawling for hours for this sort of information. Clearly and simply presented, I appreciate your time and effort.

  34. Great video, I'm just starting my first carbon fiber project and this puts the material properties in perspective. Thanks

  35. Strength and stiffness are not the same thing. Your title read "Strength Testing." You are actually testing stiffness, not strength.

    Stiffness is easy to understand; all else being equal, it increases with the cube of thickness. Twice as thick, eight times as stiff.

    Strength is too difficult to explain well, so I won't. But strength and stiffness aren't the same thing.

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