Tensile strength test bench
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This is a quickly cobbled together tensile strength test bench for 3d printed samples.
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This is a quickly cobbled together tensile strength test bench for 3d printed samples. It uses the same samples as Igor from mytechfun so the results should be comparable. I got some inspiration from here.
You will need:
- 2-pole on-off-on switch 28,5 x 22 mm:
https://www.amazon.de/dp/B07GZG37PT - Split adjusting rings 8mm (you can get away without that by using the blind hole version):
https://www.amazon.de/dp/B0CJ2G79SK - Linear guide set 550mm length x 8mm diameter
https://www.amazon.de/dp/B0DF2QH845 - Crane scale 300kg (check that you get one with the max. memory function, the 4-button version)
https://www.amazon.de/dp/B0CLYCKW47 - Linear actuator 50 mm 1500 N:
https://www.amazon.de/dp/B0BHNYTFK4 - Cables, Connectors
- 1x M8x80 Bolt & Nut
- 2x M6x60 Bolt & Nut
- 4x M4x8 Bolts
- 4x M5x30 Bolts + Nuts
- M6 washer
- O-Ring (optional)
- For the visor: some transparent cookie box
- 6V, 1A power supply
Precision
You will not get scientific precise results, mostly because of:
- Velocity of the pulling is quite fast (5.7 mm/s for the linear motor under no load at 12V, maybe half of that at 6V)
- Clamping of the samples
- Not entirely clear: Sample rate of the scale, might miss the maximum load
- FDM 3d printing is not a very precise process overall
- ISO 527-2 demands for 1mm/min (!), clamping from the side and a more refined sample geometry
It should be okish for comparing different filaments.
Attribution
Samples from mytechfun: https://www.printables.com/model/465670-mytechfun-test-objects
Switch housing is from dede67: https://www.thingiverse.com/thing:3226591
Building
The freecad files and step files are included.
The sample holders are milled with a Carvera air from aluminum, CAM is done with kiri:moto., the workspace files are included in a zip file.
For printing I used PETG with 7 walls and 20% infill.
The parts holding the sample holders in place are not fully tightened to let them align when applying the pull force, not adding additional sideways stress.
You can use an O-Ring on the bottom fixture of the actuator to keep it straight up. The washer can be put behind the sample holders to align them.
Operation
I tried different voltages for the actuator, at approx. 6 Volts or less the maximum tensile stress is mostly the same, but take that with a grain of salt. Be sure to wear safety googles, as the samples might fly around the room.
- To test for the layer adhesion print them upright (standing)
- For x-y strength print the samples lying
You can expect approximately 400-500N (layer adhesion), 700-800N (x-y) for PLA.