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Old 12-22-2007, 09:44 PM   #1
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Default Composite Laminate Samples Lab Test Results

Well, I don't have much time right now to do a full write up with details.
But basically we made up some small test samples and took them to a lab to be tested. Our main objective was to compare different layups, using core and no core, with different thicknesses.

Keep in mind these tests are relative only to each other, due to the sizes used and method of testing (small area of load). They can't be compared to other samples. At least it gives an idea of how glass compares to carbon, and flat panels to cored panels.
We'll be producing more samples to test in tension and compression. Those companies selling cheap cosmetic carbon parts don't have this data to back up their products!

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Old 12-22-2007, 09:45 PM   #2
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Old 12-23-2007, 12:01 AM   #3
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Cool stuff,

My guess whoud be that the top layers alwyas buckle because they are getting compressed while the lower layers are always being pulled if there is a force acting to deflect the sheet.


Cool data but production of cosmetic parts regardless of price don't need this sort of data, they are just simply.....cosmetic.
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Old 12-23-2007, 05:37 AM   #4
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I'd hope everyone here is not doing ONLY cosmetic stuff, it would make me sad.


TET, thank you for the test, I've been looking for a somewhat simple test such as this. Gives sort of an arbitrary rating for simple layups.
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Old 12-23-2007, 12:18 PM   #5
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Quote:
Originally Posted by 20_rc51_00 View Post

Cool data but production of cosmetic parts regardless of price don't need this sort of data, they are just simply.....cosmetic.
Regardless, this type of testing data is hard to find for composites. The companies that do it, generally don't want to give it away. And the companies selling garbage, don't even know what this testing is and don't do it.
What's really troubling is that nearly all composite parts are structural in some way. Most of them need to hold their shape, and stand up to a certain amount of abuse. Those POS "carbon fiber" hoods from VIS and the like, are often flimsier than the sheetmetal they replace. It should be at least as strong and stiff as the original.

Just figured people here might like to see some actual numbers and comparisons. This is a great place for people looking to learn about composites, and now they have solid info to help them make decisions that they otherwise wouldn't know about when learning.
At the very least, they can see how different 10 plies of glass is to 10 plies of carbon.
"Hmmm, no wonder carbon fiber is expensive."
"Wait a second, if carbon fiber is so much better, why does this shiny hood only have one layer of it?"
Let the truth be known!
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Old 12-23-2007, 12:49 PM   #6
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I would also assume that the resin system of choice would effect the strength/performance in the test. Most places would use polyester too...
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Old 12-23-2007, 02:30 PM   #7
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What resin system were you using for these test pieces? Also, infusion or not? What resin to fabric ratio? Couple tests I would like to see are a comparison between the resin types, test of some of the more exotic fabrics, and comparison of panel making techniques.

Cool data, good to see.
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Old 12-23-2007, 04:19 PM   #8
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I read that vinylester is not recommended for carbon fiber. I would like to see test results with compatible resins.
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Old 12-24-2007, 03:45 PM   #9
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you can use vinylester or polyester for carbon fiber. I just prefer epoxy myself.
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Old 12-25-2007, 06:40 AM   #10
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Quote:
Originally Posted by Fastrr View Post
you can use vinylester or polyester for carbon fiber. I just prefer epoxy myself.
it's not recommended as most (if not all) fibers have been manufactured and surface treated to be compatible with epoxies, not ester-based resins.
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