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| Re: WSF Strength Question [message #45615 is a reply to message #45614 ] Sat, 17 March 2012 11:49 UTC |
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It's PA 2200 Nylon. The strength comes from the material itself, and has very little to do with the SLS process.
Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
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| Re: WSF Strength Question [message #45644 is a reply to message #45615 ] Sun, 18 March 2012 08:45 UTC |
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I have no worries that the printing process makes a strong bond between the different particles of the powder - actually strong enough as molded Nylon.
My worries however are in regard to the fact that there is actually slightly less material in the 3D printed part compared to the same model being molded, machined or printed with an FDM printer because it's porous. Hence my question whether the production method has been taken into account in the material data sheet or not.
I could ask EOS, the supplier of the material, but I contacted them before about other stuff but never got a reply, hence why I am trying to find answers elsewhere.
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| Re: WSF Strength Question [message #45664 is a reply to message #45644 ] Sun, 18 March 2012 20:11 UTC |
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Bones are also porous, and beams with holes can be better than solid ones. ^_-
You should visit EOS page, they have the specifications for the PA2200 fused using different settings. But you will have to guess with one SW really uses and in which orientation each run is done.
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| Re: WSF Strength Question [message #45665 is a reply to message #45664 ] Sun, 18 March 2012 20:25 UTC |
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Thanks, I'll definetely have a look at that  As for the actual strength, if I model everything going by the 'worst' numbers, then I guess everything should be allright!
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| Re: WSF Strength Question [message #46463 is a reply to message #46433 ] Wed, 04 April 2012 18:44 UTC |
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You might also wish to consider other resins that have fiber reinforcement. One of the big problems with fused nylon is that once a crack starts it will propagate along the part due to the microscopic air gaps everywhere. While the tensile strength may look to be near "bulk" this is a static test and not a dynamic load test which is what your parts are going to be exposed to during use.
I recommend that you investigate the following resins:
1. DuraForm HST
2. PA 640-GSL
These resins contain fiber glass and carbon fiber reinforcement respectively. Inclusion of these fibers dramatically increase the final product's ability to manage dynamic loads as well as prevent crack propagation.
These resins are commonly used in aerospace parts that also must handle dynamic loads.
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| Re: WSF Strength Question [message #46465 is a reply to message #46463 ] Wed, 04 April 2012 19:06 UTC |
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Thanks for the advice. I'd definetely be interested in stronger (yet affordable) materials, but where are printing services for these?
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I hope to start testing this week.
