Simulate Early, Simulate Often... In Rhino
Materials question
I'm not a plastics expert, and I'm not an engineer. A lot of times finding the appropriate material specifications to add materials to Scan & Solve for some plastic resins has been challenging for me.
I'm specifically trying to get general specs for ABS, Nylon 66 and Nylon 66 30% glass fill and add those materials in using the custom materials option . So far i'm having a hard time finding 'Yield Strength' amongst others. I can find 'Tensile Strength' on most resin charts, but 'Yield' is not always available.
If I cannot find 'Yield Strength' for a plastic resin, can I just use 'Tensil Strength'? Also, will you continue to add materials to the materials list with software updates ?
Can there be a materials data base made where people can contribute material specs so they can be looked up by others?
Thanks for your time!
Kirk
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Replies to This Discussion
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Permalink Reply by Michael Freytag on
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Kirk,
Mechanical properties for ABS may be found at this link:
http://www.westlakeplastics.com/viewresult.asp?id_no=1&busgrp=CM
Mechanical properties for Nylon 66 may be found at this link (sorry, no yield strength):
http://www.ides.com/generics/Nylon/Nylon_typical_properties.htm
A yield strength for another Nylon 66 may be found at this link:
http://mdmetric.com/fastindx/t43u.pdf
Mechanical properties for Nylon 6 30% GF may be found at this link:
http://www.tamshell.com/mds-nylon6-30gf.htm
Plastics tend to exhibit significant deformation between the yield stress and the ultimate tensile stress where breakage occurs. Therefore, using "Tensile Strength" in lieu of "Yield Strength" will result in an under-estimation of the danger level in your part. Further complicating matters is the fact that many plastics do not possess a well-defined yield point since they may return to their original shape slowly after a load is removed. You could choose to use some fraction of the tensile strength in the absence of yield data. You might also try contacting the plastics manufacturer.
We will be adding materials as resources permit. Can I assume you would want new materials merged with your own rather than overwriting?
~Michael
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