[Homeroast] Poisson's ratio WAS: Re: Compak vs Macap vs Rocky Grinders

Tom & Maria - Sweet Maria's Coffee sweetmarias at sweetmarias.com
Tue May 18 11:30:03 CDT 2010


Doesn't this mean "Fish's Law"?

Are we gonna take our queues from fish now? French fish at that?

;-0

>Engineering is all voodoo anyway ;)
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>>  Date: Tue, 18 May 2010 07:59:46 -0700
>>  From: theotherjo at gmail.com
>>  To: homeroast at lists.sweetmariascoffee.com
>>  Subject: Re: [Homeroast] Poisson's ratio WAS: Re: Compak vs Macap 
>>vs Rocky	Grinders
>>
>>  Mike,
>>  Nice to hear a human description of a "Natural" force of nature.  We being
>>  part of nature. Although some would argue I'm not at all natural of this
>>  earth like my mother who used to ( tongue in cheek I'm sure ) tell friends
>>  when introducing me as a child that "Joe did not come by stork, there was
>>  this small shiny ship that landed one night in our neighborhood." Could this
>>  be why I love Sci fi and this black gold that runs through this list's
>>  vein's? I did a wiki pedia and some other reading so I would have a clue
>>  when you and RayO or anyone else shares information on this 'spro tamping
>>  topic.
>>  Very interesting and fun now back to my coffee.
>>  JoeR
>>
>>  On Tue, May 18, 2010 at 7:34 AM, Mike Koenig <koenig.mike at gmail.com> wrote:
>>
>>  > I'm probably splitting hairs here, but Poisson's effect happens on the
>>  > molecular level, with bonds elongating under pressure or strain. 
>>I'm not a
>>  > geoscience guy, but I imagine the effect effect would happen in rocks,
>>  > dense
>>  > clays and shale, etc,  but what you are seeing in a coffee puck is
>>  > interactions between discrete non-uniform particles.
>>  >
>>  > I'm not arguing at all that you don't get some lateral expansion during
>>  > tamping, since that certainly does happen, but it's not necessarily
>>  > uniform,
>>  > and dependent on the distribution (and re-arrangement under force) of the
>>  > particles, as opposed to poisson's effect, which describes a predictable
>>  > amount of lateral expansion based on the change axial length.  If the
>>  > expansion was due to poisson's effect, the puck would spring back when you
>>  > let go of the tamper.   What you are getting is some re-arrangement of the
>>  > particles under force (like when you step in sand, and it moves out of the
>>  > way under your foot).
>>  >
>>  > --mike
>>  >
>>  >
>>  >
>>  > On Tue, May 18, 2010 at 3:01 AM, <raymanowen at gmail.com> wrote:
>>  >
>>  > > Then I don't know why the grounds would press out and seal against the
>>  > > sides
>>  > > of the basket when you are only applying axial force with the tamper.
>>  > > Hydrostatic?
>>  > >
>>  > > I hope I don't owe a refund of all our pay at the Geophysics Research
>>  > > Institute at CSM. Please don't tell Dr. Levent Ozdemir or Dr. 
>>Russ Miller
>>  > > we
>>  > > were doing bad oil shale research. Damn!
>>  > >
>>  > > What supports you when you walk on a sandy beach?
>>  > >
>>  > > Teach me, please. -ro
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