gigabecquerel
gigabecquerel@chaos.social
Doing a small experiment with tempering PMMA for crack-free glueing joints, this is the before under a polariscope
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gigabecquerel
gigabecquerel@chaos.socialTwo hours at 80°C and it's remarkably lower stress!
I wonder if that works for humans, too.
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James Morris
jmorris
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gigabecquerel
gigabecquerel@chaos.socialAll non-annealed parts show cracks and none of the annealed parts do, I could not have hoped for a better result!
The gluing itself didn't introduce much stress in the annealed parts, but you can see the position of the cracks in the polariscope image of the non-annealed parts.
I'm really happy with these results, the solution to these cracks is very simple, easy and so effective!
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gigabecquerel
gigabecquerel@chaos.social@jmorris it's a lightsource and two polarization filters oriented 90° to each other, your light goes on one end, then a filter, your sample, second filter, then your camera.
Very simple way to show stress in transparent materials!
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James Morris
jmorris
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gigabecquerel
gigabecquerel@chaos.social@jmorris works at any scale as long as you are >> wavelength.
However, your sample has to be transparent!
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gigabecquerel
gigabecquerel@chaos.socialAnd, for those interested:
This is GS vs XT Acrylic stock.
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gigabecquerel
gigabecquerel@chaos.social@owiecc Not really, the high stress is just on the surface, very near to the cut.
Machining this won't feel any different, but there is a somewhat higher chance it cracks afterwards.
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