I'm holding out for 3d printed graphene.
get a lightscribe drive and some graphite oxide
World’s First Carbon Fiber 3D Printer Announced
31–40 of 43 posts
Re: World’s First Carbon Fiber 3D Printer Announced
#32Earlier quoted context omitted.
I'm skeptical too, but don't count it out because the fibers aren't woven together. The weaving is not where the strength comes from, and it's usually not omnidirectional. If this machine can set the wrap angle, and build out several layers, the fiber layout might be comparable to a filament winding process. http://en.wikipedia.org/wiki/Filament_winding But the thing that I'm concerned about is the curing of the stuf…
Looking at the specs page, their claimed yield stress is 20% higher than aluminum compared to a factor of ~4x for traditional CF composites. Also concerns about the fiber content may be misguided. The hard part of CF compoisites is the the layup process, which is what a 3D printer would do. The part can then be vacuum bagged to pull out the resin, as in traditional CF manufacturing techniques.
Where did you get that yield stress number? Is it from that graph with Aluminum and the plastics?
Because that graph shows modulus(stiffness), not strength. Which is pretty hinky when placed next to the statements about strength. Looks to be a bit misleading.
On top of that "stronger" has no meaning when it comes to composites. There are about 9 different failure modes, and you can't just choose one and report the "strength". I'm guessing they're talking about axial tension numbers (because I'm cynical) where their material would perform the best. Even then, their yield strength is about 200MPa (based on the "5x stronger than ABS" statement) whereas aluminum's yield strength tops out around 600MPa.
Re: World’s First Carbon Fiber 3D Printer Announced
#33Earlier quoted context omitted.
Looking at the specs page, their claimed yield stress is 20% higher than aluminum compared to a factor of ~4x for traditional CF composites. Also concerns about the fiber content may be misguided. The hard part of CF compoisites is the the layup process, which is what a 3D printer would do. The part can then be vacuum bagged to pull out the resin, as in traditional CF manufacturing techniques.
Where did you get that yield stress number? Is it from that graph with Aluminum and the plastics? Because that graph shows modulus(stiffness), not strength. Which is pretty hinky when placed next to the statements about strength. Looks to be a bit misleading. On top of that "stronger" has no meaning when it comes to composites. There are about 9 different failure modes, and you can't just choose one and report the "s…
Good catch on them showing E vs strain instead of stress/strain. Very misleading, as it clearly got me!
Re: World’s First Carbon Fiber 3D Printer Announced
#34I'm holding out for 3d printed graphene.
I read last week about an Australian researcher using honey as a base to make graphene. Can just see people keeping bees in their backyards to create base material for their future printers...
Re: World’s First Carbon Fiber 3D Printer Announced
#35apropos of nothing, that floating social media bar in the middle of the page on this site is infuriating.
Re: World’s First Carbon Fiber 3D Printer Announced
#36Count me as skeptical. The strength of high-quality carbon fibre comes from having many pieces of fibre woven together over the surface omnidirectionally (Okay, I'm mostly wrong here - see below). This machine seems to simply lay it down in a (more or less) continuous strand, which means that the fibres will be cohesive rather than woven together. You can do this without a special printer - all you need is some carbo…
Can carbon fiber be needle punched to get most of the benefit with a much much simpler process? I reckon adding some sort of barbed needle that can move over the surface of laid carbon fiber could accomplish this on non-flat surfaces. It would probably need some sort of corresponding arm on the backend to support the carbon fiber and accommodate the passage of the needle through the supporting platform.
Besides needle-punching, there are a bunch of other non-woven technologies that I reckon could be applied to carbon fibers in some form.
Re: World’s First Carbon Fiber 3D Printer Announced
#37Earlier quoted context omitted.
> The strongest CF pieces are made of unidirectional CF, where all fibers are oriented in the direction of the main effort. You're confusing issues even further! To anyone who wants to actually understand this: Carbon fibre doesn't have a single "strength" value since it is virtually always anisotropic - its strength varies massively depending on which direction you stress it in. GP is correct in that the carbon fibr…
Delaminated Dreamliner sounds like a maintenance person's worst nightmare. Wouldn't you have to replace the entire part? Where "part" is wing, rudder or fuselage.
Delaminated Dreamliner sounds like a Fedora or Ubuntu release codename.
Re: World’s First Carbon Fiber 3D Printer Announced
#38The allure of carbon fiber in industry has to do with the properties of the material that can be produced. Home made carbon fiber won't be all that great of a material compared to what people see out in the world (on race cars, planes, etc...). Production lines for producing commercial carbon fiber is super expensive ($100 million+). Zoltek has a basic rundown of the process [0]. [0] http://www.zoltek.com/carbonfiber…
That's the whole point. It's disruptive technology: not as good, way more accessible.
Re: World’s First Carbon Fiber 3D Printer Announced
#39It looks like a mac.
Re: World’s First Carbon Fiber 3D Printer Announced
#40Count me as skeptical. The strength of high-quality carbon fibre comes from having many pieces of fibre woven together over the surface omnidirectionally (Okay, I'm mostly wrong here - see below). This machine seems to simply lay it down in a (more or less) continuous strand, which means that the fibres will be cohesive rather than woven together. You can do this without a special printer - all you need is some carbo…
A detailed vid of a fibre plant ...
(An Inside Look at BMW's Carbon Fiber Manufacturing Process)
... https://www.youtube.com/watch?v=kaoq8Mc4xxw