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Old 08-10-2013, 04:25 PM   #491 (permalink)
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Neil,

I work in the aviation industry and work with composites on a regular basis. When it comes down to it, I end up using West System w/slow hardener as my "go to" repair epoxy. It is easy to work with, reliable, trouble free and produces a quality part or repair. Even by hand, without vacuum bagging.

You could easily go crazy and choose super expensive Hysol products, and not get better results.

Interestingly, a simple "2 core 2" panel of carbon fiber and West Sys (2 layers carbon each side of the core) uses very little epoxy and is amazingly strong. Good enough for high end aerobatic aircraft that regularly see 10G's.

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Old 08-10-2013, 11:20 PM   #492 (permalink)
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i ordered 7 of them to test.
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Old 08-11-2013, 07:30 AM   #493 (permalink)
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I gotta build it to be able to test it.

I'm back from vacation, and I've made three more samples:

(2) layers 8.9oz E-glass each side with rough surfaces
(2) layers 8.9oz S-glass each side with rough surfaces
40oz E-glass each side with rough surfaces

I try to test them tomorrow to allow a similar dry time to the previous samples.
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Old 08-11-2013, 08:52 AM   #494 (permalink)
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Neil, I'm not at all being critical. Sorry if I came off that way. Your project is extremely interesting to me.

What I had intended to say was that "2 core 2" , done properly is exceptionally economical with epoxy use. In other words, one quart of the stuff will go a very long way. It's not at all like fiberglass construction in the old days.
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Old 08-12-2013, 11:26 PM   #495 (permalink)
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Quote:
Originally Posted by Christ View Post
This one's a prototype, right?

Prototype vehicles are NEVER built with top-end materials.
Sure, but there's a difference between not choosing top-end materials and a suicidal attempt.
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Old 08-13-2013, 01:53 AM   #496 (permalink)
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I'm with [cut]cRiPpLe_rOoStEr[paste].

My concern is that you are testing with thin rectangular strips and will extrapolate to the gross structure.

Your results might be affected by edges or corners. I'd test by using a circular clamp aka two pieces of pipe; and drop a ball in the center. To isolate the behavior of the material en mass. At that particular thickness. In other words you would be able to test the performance of thickened edges and flanges as well as a thin skin.
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Old 08-13-2013, 09:12 AM   #497 (permalink)
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My test only shows relative strengths of the fiberglass fabrics. The only way to test the structure is to test the chassis I'm building. After I start the fiberglass on the chassis, I'll be able to test the actual thing, by loading it; not unlike how Burt Rutan tests his composite airplanes.

Folks, I weigh ~235 pounds and with the plywood (which weighs about 40 pounds?) inside the chassis - with on the foam only, and it was fine. So, the giant 'U' shape forms a strong structure, and when it gets the fiberglass it will be a lot stronger.

Edit: I've now rested the 3 new samples and charted them in comparison to the 3 strongest samples from the first test.




The deflection is less on the newer samples, but the 'knee' is at the same load, and the top of the two layers samples is wrinkling, indicating (I think) that the thickness of the sample (1") and/or the compression strength of the foam is the limiting factor. Also, notice that the deflection at the lower weights is below the "resolution" of my jig.

Edit 2: here are pictures of the new samples:

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Old 08-13-2013, 03:33 PM   #498 (permalink)
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OK, I went back and looked. They were always that size weren't they? ...I confuse easily.

How's it going with the windshield?
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Old 08-13-2013, 06:16 PM   #499 (permalink)
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Yes, all the samples have been the same size - about 10 1/2" x 6" x 1". The test span is 10" with the bearing rod 5" from either support. Two of the three rods are free-moving and one is fixed.

I still need to buy the windshield and the wipers to go with it.

Edit: The box beams in the frame of a 1/2 ton pickup are about 6" deep. The floor of CarBEN is about 8-9" deep, and the sides form a 'U' that is about 32-36" deep. The box beam on the pickup is about 2" wide, and the bottom of CarBEN is about 5 *feet* wide.
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Old 08-14-2013, 10:13 AM   #500 (permalink)
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Neil,
I ran across this information recently about windshields. I can't post a link but if you go to Facebook and search for Wikispeed and select the top item of the search it shows how these people assured a good fit for their windshield.

Stan

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