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ChebyshevII PE

EB Mafia

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5 minutes ago, JayKay PE said:

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15 minutes ago, ChebyshevII PE said:

We haven’t even started and JayKay is already the town drunk.

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@MEtoEE

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I am home from the field for a few days...I go back for a week next week.

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2 hours ago, JayKay PE said:

 

@MEtoEE

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On 1/14/2020 at 3:49 PM, jean15paul_PE said:

Yeah, but plastics don't have a well defined modulus like metal do. Suppliers will publish a modulus, but if you plot the stress-strain curves, they are nonlinear from the start. Also with plastics, the "same" material can be very different from different suppliers. 304 stainless steel is going to be pretty much the same no matter who you buy it from. This is very not-true for plastics. Then some plastics have variations in properties depending on how it's processed (mold temperature, mold pressure, amount of shearing as it's forced through the gate, additives/colorants, etc). And nylons are notorious for absorbing moisture. They will suck water right out of the humidity in the air, and change both dimensions and properties. 

Because of all this stuff we obtain all of our material properties via in-house testing. I'm plotting a bunch of comparison curves now.

Sorry, this is probably way more than you wanted to know.

Anyone hungry? I made spaghetti

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(blank...ooops)

 

Edited by MEtoEE

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Just now, jean15paul_PE said:

Anyone hungry? I made spaghetti

image.thumb.png.187477496c63760252a2ec1afd473426.png

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1 hour ago, MEtoEE said:

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A double post?  In an EB thread?
 

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I didn't mean to double post.  I was trying to delete the original one and repost.  Oh well I'm a rookie.  How do you delete a post you made?

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1 hour ago, RBHeadge PE said:

Are those all from ostensibly the "same" material?

If so, makes me very wary how plastics are advertised.

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So triple post is ok, but double post not?

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2 hours ago, MEtoEE said:

So triple post is ok, but double post not?

 

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48 minutes ago, JayKay PE said:

 

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*JK upon checking thread and seeing nothing exciting has happened/obviously no round happening this week*

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Wrong. We never stopped playing last round. The vigilante has silently been killing off the remaining townies during the night, because he was paid off by the mafia before they were lynched. He didn't have to continue, obviously, since the mafia were no more, but he's a man of principle and a deal is a deal.

Edited by Chattaneer PE
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15 hours ago, RBHeadge PE said:

Are those all from ostensibly the "same" material?

Probably similar material just proprietary to that manufacturer. 

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17 hours ago, RBHeadge PE said:

Are those all from ostensibly the "same" material?

 

15 hours ago, MEtoEE said:

If so, makes me very wary how plastics are advertised.

 

1 hour ago, NikR_PE said:

Probably similar material just proprietary to that manufacturer. 

No. This is a bunch of different materials. I just wanted to get them into the same file for easy comparisons. That chart isn't super useful by itself, but if you filter it for only the ones you're interested in, then it becomes pretty handy.

7 material "families": acetal, polypropylene, nylon, polyurethane, polyethelene, and ployketone
With multiple formulations and/or temperatures for most of them

 

Note: I hid all the numbers because it's considered company proprietary data

Edited by jean15paul_PE

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