Smart on sun 11 jul 99
Hi... my name is gidia and I was wondering if someone could help me.
Does anybody know of any research been done into the effects of different =
glazes
on the brittleness of clay (how easily the clay breaks when pressure is =
applied
to it)?
I am doing a CAT (Coomon Assesment Task) for Year 12 Physics and hope to
investigate this problem.
Thankyou in advance...
=2A gidia =2A
gemiroquai=40chickmail.com
John Baymore on tue 13 jul 99
------------------
(snip)
Does anybody know of any research been done into the effects of different
glazes on the brittleness of clay (how easily the clay breaks when pressure
is applied to it)? I am doing a CAT (Coomon Assesment Task) for Year 12
Physics and hope to investigate this problem.
(snip)
Gidia,
Hi. Welcome to the list.
What you describe sounds like MOR...... Modulus of Rupture. It is more
like a function of strength than actually =22brittleness=22. If I remember
correctly.... there is also a testing for =22brittleness=22 and it involves
more of a shock from impact than a steady pressure. Yes ...MOR has been
studied for a long time. Specific studies in the craft pottery field are
rare....more the province of the industrial folks. And yes, glaze
type/composition can affect the MOR of a clay/glaze combination.
Contact the American Ceramic Society (they are on the Web) located in
Ohio..... for more refererences. Or in the library, most any basic ceramic
engineering oriented clay body text. Also check ASTM....American Society
for Testing and Materials. They are responsible here in the US for
standardizing certain tests.... not sure if this falls in any way under
them....but it might.
The formula for MOR is....if I am remembering correctly..... check this
before using....I'm in the brain database here.......which has some bad
memory locations, I think =3Cg=3E:
MOR=3D3 X (max. weight supported X span in cm) / 2
Hope this is helpful in pointing you somewhere. Good luck with the
project.
BEst,
.....................john
John Baymore
River Bend Pottery
22 Riverbend Way
Wilton, NH 03086 USA
603-654-2752
JBaymore=40compuserve.com
John.Baymore=40GSD-CO.COM
=22Earth, Water, and Fire climbing kiln firing workshop Aug. 20-29,1999
-one space available=22
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