Drop Testing: Carbon Fiber, Steel, Aluminum Comparison

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1. If your head is in the area the composite bar temporarily deforms into, then it didn't do you much good.
2. carbon fiber is not used like that
3. this test isn't accurate at all
   Springs in the test jig are pulling the material back to it's staring position, that will favor anything that loses it's rigidity when damaged. To make it accurate there shouldn't be any forces beside gravity working on the material after impact.
4. Not so, The answer lies in what you are wanting to test. True Carbon fibre composites are extremely strong DEPENDING on what duty you want them to perform, they are extremely bad when it comes to Ductility and Malleability. Case in point, on an F1 car the wishbones are made from Carbon fiber, great in a straight line and in cornering but even the slightest nudge into a tyre wall at right angles to the longitudinal axis of the car and they shatter like glass. It will be interesting to see what Graphene composites are like in the real world.
5. Who makes the BEST  drive shafts of carbon fiber composites
6. This a little bit deceptive, as with carbon you can build a custom layup that would withstand this impact and just flex and not deform at all. Carbon's strength is in the tensile load; if the fibers are laid up in the proper direction and adequate mass they can handle any load including an impact in the center of a tube like this. However this is not a practical consideration for any material. The loads are tensile, compression and torsional in normal usage and impact load is incidental. Unless impact is part of the normal job of a device, designing for that is a waste of material and mass.
7. cool
8. Kevlar got absolutely fucked up, wow.
9. Do tanks have carbon composite matrix built into them between the steel?
   What material would stand the best against a tank shell? Same thickness.
   Could you fire a handgun or rifle on a monocoque (F1 Car cockpit) without making a hole?
10. You should of included the number of layers and weight of the carbon used? you cannot accurately compare the composites against the steel without this information.
11. Carbon fibers strength comes from tension, you put carbon fiber around a core that has high compression like cement or end grain hard wood, it will be a lot stronger, but only on the first hit, each hit after will get weaker and weaker.
12. So carbon fiber matrix is the best after all. :)
13. Carbon fibre is extremely expensive to repair properly. You can't use heat or a hammer to restore it's original shape.
14. In my personal opinion this is a very ineffective way to use cf composite. Composite materials are not effective for impact to begin with.metals are way more effective at absorbing energy during collision where fibers fail in a brittle manner which is undesirable
15. Omg I hope supercars use the "Carbon Fiber composite" stuff,or you'll die in almost any car crash.
16. Interesting test, but it's not very representative for material comparison. I love CF, but you can clearly see that the Carbon Fiber Sandwich Composite breaks and has no strength left at all, the only thing that holds it together is the foam core, so it absolutely does not "outperform all conventional materials". You can even see how it bends after the impact when the drop hammer comes to a stop on the Composite. Carbon fiber shouldn't really be designed for impact anyway, it should mainly be designed to withstand tensile forces.
    
    Also there is no info about the Laminate itself in the sandwich. Which fiber type was used... Was it a woven fabric, spread tow fabric or UD laminate with 0°, or different orientations of the plys ... there are so many things that influence the mechanical properties.
17. Awesome video.
18. 1:43 It went lower than the aluminum. So why'd they mark it so high up???
19. A roll bar/cage is intended to keep you from being crushed under the weight of a rolling/tumbling vehicle, if you look carefully the "carbon fiber composite" even exceeds the aluminum in terms of intrusion distance. Stupid and pointless comparison, by this test, the best material to build a roll cage out of would be rubber...
20. Berilium, Titanium and Aluminium the best.