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Re: pic: Carbon fiber monocoque drivetrain Top view
Like some of the other posters, I'm no expert; but I immediately wondered why the design includes so many 90 degree corners and edges.
Aren't sharp corners/edges the exact places where structures made from carbon fiber, or similar materials, are most likely to fail, when the entire structure flexes? Isn't the key to success allowing many fibers to share a load instead of letting the load get concentrated onto a few fibers (at corners/edges)? Color me curious. Blake |
Re: pic: Carbon fiber monocoque drivetrain Top view
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Imagine a flat piece of carbon fiber that is 4" wide. In some directions it is strong, but in others it is very flexible and not very strong. Now imagine that same amount of carbon fiber is instead a 2" by 1" C channel. In that configuration, it might break along its corners if enough force is applied, but it would be a lot stronger and more rigid for the same weight. |
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Carbon fiber bicycle frames are made of roundish tubes, not box shapes. Antenna towers, crane booms and frames, car roll cages, are generally made from (round) tubes, not boxes. Rounded shapes might be worth investigating. Definitely ket us all know how the eventual frame holds up, if one gets built. Blake |
Re: pic: Carbon fiber monocoque drivetrain Top view
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Re: pic: Carbon fiber monocoque drivetrain Top view
Cool concept. Unless your team doesn't have the in-house resources to make a drivertrain, this would likely take a lot of time and delay the rest of the robot. On top of that, unless you design in a standard mounting system, later in season it may be tricky to modify the robot to improve it. How would you repair it at a regional if it broke?
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Re: pic: Carbon fiber monocoque drivetrain Top view
Every year since 2006 I have found some component of the robot that could benefit from a composite material and lead the team on it's construction. Do we have to use composites - NO. We do it to expose the students to them. As far as doing a whole frame or chassis, this would require expertise and considerable experience. If a team does not have this, don't attempt it. Start off with some smaller lay ups. There is always fiber glass pulltrustions to work with. Done right composites can can be wonderful. Done wrong you have some expensive trash.
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I forget the VA/NC team who usually does carbon fiber. They've been next to us in the pits a few times, so I got to talk to them. IIRC, a lot of their super structure was rounded tubing. The edges of the drive train frame were filleted with a small (0.25"-0.5") radius but otherwise the faces were straight. On the plus side, this stuff is so lightweight you can disassemble the vast majority of the superstructure into COTS parts and the carbon fiber frame while still being under the withholding limit. The downside to that is that you're spending all day on Thursday re-assembling... |
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Re: pic: Carbon fiber monocoque drivetrain Top view
Ah - found them - 1829, the Carbonauts:
http://www.thebluealliance.com/team/1829/2015 Looks like for 2015 they went to Aluminum. I'll see them this weekend at Rumble in the Roads, anyone have any specific questions for them? |
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