Another advantage of 3K carbon fiber is that it could protect the spoke hole from flaking when drilling it. That's why we like to add the layer of 3K weave fibers inside of rims. The advantage of UD carbon fibers is strength. That's why we makes all rims with UD fibers to support. Additionally, there's a thought saying that in theory woven fibers like 3K as the outer layer on a rim has a better impact strength, but there isn't a real experience or test could support this standpoint.
We Nextie makes all carbon fiber products in high performance, no matter what weaves they are applied as outer layer. It's not quite necessary to discuss the performance of a rim in which weaves. The longer distance between tow interlaces means fewer crimps compared to a plain weave and less potential stress concentrations. It is used in many cosmetic and decorative applications, but also has great functionality, it has both moderate formability and moderate stability.
The satin weave was designed thousands of years ago for making silk fabrics with excellent draping qualities, while also looking smooth and seamless. For composites, this drapability means it can easily form and wrap around complex contours. Because the fabric is so formable, it, expectantly, has low stability. As you increase the number of the satin weave, formability will increase and fabric stability will decrease. The number in the Harness Satin names indicates the total number of tows passed over then under.
For 4HS, it will pass over 3 tows then under 1. For 5HS, it will pass over 4 then under 1, and 8HS will pass over 7 and under 1. Spread tow material can be a good compromise between using uni-directional material and standard woven material.
As a fiber tow weaves up and down to create a fabric, the strength is reduced due to the crimp in the tow. As you increase the number of filaments in a standard tow, from 3k to 6k for example, the tow becomes bigger thicker and the crimp angle becomes harsher. One way to avoid this is to spread the filaments out into a wider tow, this is called a spread tow and there are a couple of benefits gained by doing this.
The spread tow offers a smaller crimp angle than a standard tow weave and can decrease the crossover defects by increasing the smoothness. A lower crimp angle will result in higher strength.
Spread tow material is also easier to work with than uni-directional material and still has reasonably good fiber pull up prevention. As the name implies, uni, meaning one, all of the fibers are oriented in the same direction. This gives uni-directional UD fabric some high strength benefits. Rather, there are continuous fibers that increase the strength and stiffness.
Another benefit is the ability to tailor the layup with better control for performance characteristics. A bicycles frame is a good example of how UD fabric can be used to tune the performance.
With UD material you can pick the precise direction of the fibers to get the strength you need. One major drawback with UD though is its workability. UD tends to fall apart quite easily during the layup process since it has no interlaced fibers to hold it together.
If the fibers are placed incorrectly it can be almost impossible to correctly reorient them all again. Its similar to 12K but a bit bigger and you can also see how a seam looks like:. This is how 3K looks up close:. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Learn more. Difference between UD, 3K and 12K carbon finish? Ask Question. Asked 6 years, 5 months ago. Active 6 years, 5 months ago. Viewed 60k times.
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Either is fine. View Results. Login required to started new threads Login required to post replies. Quote Reply. Post 1 of 12 views. Is there a performance difference? Re: 3k vs. Post 2 of 12 views. Allan, I think it means fibres per square inch if i remember correctly.
A 12 k weave will have four times as many as a 3 k, but probably finer fibres.
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