Material Strength Test Sample

by rsilvers, published

Material Strength Test Sample by rsilvers Jun 17, 2013
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I am using this to compare Taulman 645 Nylon to Trimmer Line:



I print samples, then use three Carabiners to pull them apart, and see which one fails first. I recommend that you weigh your samples to make sure that you are doing a fair test. Whichever one breaks first, make more samples of it with more layers until it breaks second, and then weigh that - to see how much you had to add to it to overtak the stronger material. Note that the type of infill that you use will make a difference.



Preliminary results - I weighed the two samples on an Ohaus laboratory scale:


The trimmer-line sample was 6.10 g. The T645 was 5.47g. The T645 broke. This test needs to be repeated with the T645 weighing the same or more. I can increase the extrusion multiplier by 12%.

I completed the second test. This time I made sure that the weights were closely matched through control of the extrusion multiplier. 5.86 grams for the trimmer line and 5.93 grams for the T645. That is less than 1.2% difference. This time the T645 won. I set up tow straps with my Sequoia, and the samples did not break when I took my foot off the brake and let the truck creep forward. They just stopped the truck from moving! Then I gave more gas and the blue snapped. I bet these can support my weight many times over.

From these very limited sample points, it appears that the T645 is stronger, by at most about 9.7%.

Third test:

I just had to find out what would win a tug-o-war, so I printed these on my M2 with E3D hot end and then pulled them apart. 6 top and bottom. 4 perimeter. 0.15mm layers. 99% infill.

Since there is just one sample of each material, it is not statistically-valid. Ranked from best to worst:

GizmoDork black Polycarbonate (290C) $50 per KG
Polymaker Polymax (205C) $77.89 per KG
ColorFabb PLA-PHA (205C) $56.00 per KG
eSun PETG (yellow) (250C) $33.99 per KG
Taulman Tritan (275C) $90.00 per KG
ColorFabb XT (250C) $65.33 per KG
Octave ABS (230C) $31.00 per KG

Not tested yet:
Taulman 645 (245C) $70.40 per KG

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Is it just me or dos it look like the carbine has a different shapes in each end?
(Changing the way the pressure is applied)

In my crush tests, they were about the same:


I have not have feeding problems with the trimmer line. I have not had contaminants. I am using a 0.40mm nozzle. I have not noticed diameter variation. 240C (as measured by a Printrbot) is the best temp so far.

So what are your preliminary results so far? How accurate a diameter does the trimmer line have? Any problem with contaminants?

I have not have problems with contaminants. The diameter accuracy is - well - I have never measured that variation on any of my filament. There is no reason to suspect that it is any worse than for printer filament. My current problem is that the 1.64mm that it has been running is too narrow for the adjustability range of my current filament drive.