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

Ryan M. Ward silvercro_magnon at hotmail.com
Tue May 18 17:24:13 CDT 2010



Now is the second man's Poisson, the first man's mean?
-- 
Ryan M. Ward

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> From: robotyonder at hotmail.com
> To: homeroast at lists.sweetmariascoffee.com
> Date: Tue, 18 May 2010 14:39:54 -0700
> Subject: Re: [Homeroast] Poisson's ratio WAS: Re: Compak vs Macap vs	Rocky	Grinders
> 
> 
> One man's Mean is another man's Poisson!
> 
>  
> 
> Happy Roasting,
> 
>  
> 
> robert yoder
>  
> > From: koenig.mike at gmail.com
> > Date: Tue, 18 May 2010 10:34:03 -0400
> > To: homeroast at lists.sweetmariascoffee.com
> > Subject: Re: [Homeroast] Poisson's ratio WAS: Re: Compak vs Macap vs Rocky Grinders
> > 
> > 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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