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Old 02-15-2010, 10:25 AM   #41
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Quote:
Originally Posted by MoPower View Post
Awesome, is there a reason why you are not doing it with epoxy? I thought that was the strongest combination.
There's no reason, this is simply what we were testing at the time for a specific project. Just trying to show the customer the relative strengths of the different construction options, no trying to achieve the highest ultimate strength.
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Old 02-19-2010, 12:14 PM   #42
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we got our first set of testing done today. I'll hopefully be able to post up some pictures and test results early next week.

on a similar note, TET, do you have a good source that shows good examples for failure modes in composites. We have a few samples that all look ever so slightly different at the failure point, and I want to make sure I document to correct mod of failure whether it be delaminatation, buckling, etc...I'm quite new to composites and don't want to be wrong about the mode of failure when analizing the samples.
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Old 02-20-2010, 07:55 AM   #43
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PM me next week, I'll see if I can find the correct ASTM standard, and if they have pics of failure modes.
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Old 02-20-2010, 09:08 AM   #44
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Could I get a copy of those failure modes as well if you find them Riff?
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Old 02-20-2010, 09:40 AM   #45
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Originally Posted by cs900 View Post
we got our first set of testing done today. I'll hopefully be able to post up some pictures and test results early next week.

on a similar note, TET, do you have a good source that shows good examples for failure modes in composites. We have a few samples that all look ever so slightly different at the failure point, and I want to make sure I document to correct mod of failure whether it be delaminatation, buckling, etc...I'm quite new to composites and don't want to be wrong about the mode of failure when analizing the samples.
It depends on the type of testing. Tensile, compression, and bending failures will all be different.
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Old 02-20-2010, 10:02 AM   #46
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well we are doing a 3 point test, so I'll only need bending failures.

riff, I think I saw that spec at some point when first doing research on composite testing, but I have no idea which one it is now.
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Old 02-20-2010, 11:51 AM   #47
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ASTM D 790 - 03 for 3 point bend
ASTM D 6272 - 02 for 4pt. bend
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Old 02-22-2010, 11:44 AM   #48
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that's the spec (D790) we "followed" (as close as we could), and I don't believe it has modes of failure in it. Maybe I don't have the full spec, but i think it's just test set-up and result caclulations. I'll have to look it over again.
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Old 06-26-2011, 06:11 PM   #49
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Quote:
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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!

Pics have notes.




Aloha Tet ,
What core were you using? What do you think caused the failure?
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Old 12-19-2016, 06:19 AM   #50
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Hey there,
could you please share your test lab contact info? I would like to have them test a few pieces as well. What size do they need to be?
Thank you,
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