Re: [ATM] PLOP Q's: YM for Plate is low; Why no shear modulus?

["Robert Houdart" <robert.houdart@cruxis.be>]

Mark,

1) Agreed, for "soda lime glass" the Young's modulus is listed around 70
GPa. For example here: www.mindrum.com/tech.html#glassprop.
Hard to tell why the creator of Plop used the lower value, maybe a lower
bound was used to compensate for variations in the chemical composition
of "plate glass".

2) The shear modulus is computed from Young's modulus and Poisson's
ratio.
G = E / 2(1 + v).

Cheers, 
Robert
www.cruxis.com/scope/scope1100.htm


> -----Original Message-----
> From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On
Behalf
> Of Mark Cowan
> Sent: woensdag 12 september 2007 23:59
> To: atm@atmlist.net
> Subject: [ATM] PLOP Q's: YM for Plate is low; Why no shear modulus?
> 
> Hi all,
> 
> A couple questions, in no particular order, stemming
> from a discussion on another forum (CN):
> 
> 1)  Where did the 60 GPa value of Young's modulus for
> plate come from?  Most of the values I can find are
> around 70 GPa.  For other materials (Pyrex, fused
> silica) the values look appropriate.
> 
> 2)  If, as Toshimi Taki states (S&T April '96 p 77)
> that shear dominates deformation for many-point cells,
> why is there no value for shear modulus for the FEM?
> Is it calculated from Young's modulus and Poisson
> ratio?  I admit my relative ignorance in this field,
> but I know there are people on the list who are quite
> expert. :)
> 
> Best,
> Mark


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