RE: powder packing density!!!

From: Miller, Michael W <>
Date: Mon Feb 23 2004 - 16:04:02 EET

I've always wondered, what's the packing density for spheres?

Bear in mind most powders have a range of sizes, hence tighter packing =
is obtained as the smaller particles fill up the spaces between the =
bigger ones. Also when dealing with powder, other factors such as flow =
are affected by non-round shapes.

Michael W Miller ( =20
The Boeing Company M/C 45-17 A-2329 206-655-3289
Rapid Product Manufacturing 655-4366 655-4365 655-2262 =20

Disclaimer: Engineer and out the other!
Experience is something you get right after you need it.

-----Original Message-----
From: Toby Gill []=20
Sent: Friday, February 20, 2004 4:34 AM
Subject: powder packing density!!!

Thought this may be of interest to some,

It has just been published that M& M sweets pack together more densely =
perfect spheres when randomly jumbled in a container.
It was also discovered that by stretching the M&M shape (so elliptical,=20
like an almond) in computer simulations, a packing density approaching =
packing fraction of 0.74 was achieved.

This seems to me to be important to anyone involved with producing=20
components from powders, be it by conventional methods or by rapid=20
manufacturing techniques. Does anyone have any comments/thoughts on this =


P.S. I have just finished a PhD based on SLS and am currently looking =
employment. Anyone who has any vacancies arising in the near future =
contact me at the email address above.


Toby Gill
Received on Mon Feb 23 16:26:09 2004

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