Re: [ontolog-forum] Theory of properties - stress tensor

[Deborah MacPherson <debmacp@xxxxxxxxx>]

Thanks very much this is exactly what I'm working on and yes the context of the tests and the units is really important. Have you looked at the International Framework for Dictionaries (IFD)?
I'll take a look at the link below also - Thanks!

Deborah

On Tue, Jul 12, 2011 at 2:39 PM, David Leal <david.leal@xxxxxxxxxxxxxxxxxxx> wrote:

Dear Deborah,

The problem is that "tensile strength" is a property that is defined
by type of test. For different types of material there are different
types of test. In most cases, these tests are defined in ISO
standards.  An example is ISO 6892-1 "Metallic materials - Tensile
testing - Method of test at room temperature".

Hence the statement "material A has a tensile strength of 200 MPa" is
meaningless on its own. The statement needs to include the
qualification "to ISO 6892-1". For quality assurance purposes, the
statement about the tensile strength needs to be combined with
additional data about how the test was performed. The additional data
is also defined in the testing standards.

Some initial work on this area was carried out by the CEN ELSSI-EMD
project -
see
http://www.cen.eu/CEN/sectors/sectors/isss/activity/Pages/ws-elssi.aspx.
This web page gives links to:
- a report on the use of XML schemas and ontologies for representing test data;
- an initial ontology for material test data;
- an example instantiation of data about a tensile test.

Best regards,
David

At 19:14 12/07/2011, Deborah MacPherson wrote:
>Hi John, everyone
>
>I'm part of a work group for OmniClass Properties which deals with
>building materials. The terminology is OK and most participating are
>SME's. The problem we are having is dealing with something like
>tensile strength that means one thing with steel and another with
>epoxy flooring. Any suggestions for multiple
>contexts/usages/definitions/testing and performance requirements?
>
>Thanks
>
>Deborah
>
>On Mon, Jul 11, 2011 at 8:18 AM, John F. Sowa

><<mailto:sowa@xxxxxxxxxxx>sowa@xxxxxxxxxxx> wrote:
>On 7/11/2011 4:16 AM, David Leal wrote:
> > With a very loose RDF-type meaning of "property", this use
> > of the term is OK...
>
>That is why I do not recommend RDF -- or many other needlessly
>complicated notations and the baggage they drag along.
>
> > A von Mises's equivalent stress may be a physical property of a
> > body B at a point P, but it is surely not a physical property of the
> > stress tensor. Instead it is derivable from the stress tensor by a
> > mathematical operation. It so happens that this derived quantity has
> > a physical meaning - it is a predictor of plastic flow.
>
>That paragraph uses a lot of specialized terminology from the
>subject matter.  That is the way that a subject matter expert
>talks, and the ontology should stay as close as possible to
>the terminology used by the SME.
>
>Words like 'property', 'attribute', 'feature', 'facet', etc.,
>all map to one-place predicates or relations in logic.
>
>Therefore, I would only use *one* metalevel word.  In Common Logic,
>that word is 'relation'.  Everything maps to a relation.
>
>Bottom line:  When you talk about the ontology for a subject,
>you should only use the terminology of that subject.
>
>John
>
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>Deborah L. MacPherson CSI CCS, AIA
>Specifications and Research Cannon Design
>Projects Director, Accuracy&Aesthetics
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============================================================
David Leal
CAESAR Systems Limited
registered office: 29 Somertrees Avenue, Lee, London SE12 0BS
registered in England no. 2422371
tel:      +44 (0)20 8857 1095
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Specifications and Research Cannon Design
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