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

Doug Hoople doughoople at gmail.com
Wed May 19 14:08:12 CDT 2010


One word: bouillabaisse. :)

Doug
On Tue, May 18, 2010 at 9:30 AM, Tom & Maria - Sweet Maria's Coffee <
sweetmarias at sweetmarias.com> wrote:

> 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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>> Ryan M. Ward
>>
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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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>>>
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>
> --
> -Tom
>
>
> ____________________________________________________________________________
> "Great coffee comes from little roasters" - Sweet Maria's Home Coffee
> Roasting
>              Thompson & Maria - http://www.sweetmarias.com
>
> ____________________________________________________________________________
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