Glenn,
I've never seen the demos you mentioned, but if someone with access to
commercial Macsyma can find these demos, run them, and capture a transcript,
I'd be happy to check if I can adapt them to run with the current tensor
packages (and fix any tensor package bugs that they might help uncover!)
The CTENSOR package can be used to obtain numerical answers without undue
difficulty, since it treats tensors as matrices. The ITENSOR package is much
more abstract, and really meant for symbolic manipulation of "indexed
objects"; however, I can easily envision one using ITENSOR to derive an
equation, convert this to a CTENSOR program using the built-in
functionality, and then substitute numerical values to obtain a numeric
answer.
Viktor
PS: Don't send me any actual commercial Macsyma files please; I'm interested
in reproducing functionality, not stealing commercial code.
-----Original Message-----
From: maxima-admin@math.utexas.edu [mailto:maxima-admin at math] On
Behalf Of Glenn Ramsey
Sent: Sunday, October 30, 2005 2:53 PM
To: maxima@math.utexas.edu
Subject: Elasticity demo
Hi,
I am wanting to use Maxima to do some material parameter estimation
which involves evaluating the finite elasticity stress and strain
tensors. One way to do this is to represent the relevant tensors as
matrices but since Maxima can deal with tensors I am wondering if there
would be any advantage in using the tensor functions instead?
However I'm still learning about all this and I can't figure out from
the available demos how to do it.
In an old newsgroup post some Macsyma demos on elasticity were
mentioned, and I thought these might be a good place to start:
> Newsgroups: sci.math.symbolic
> From: "Richard J. Petti" - Find messages by this author
> Date: 1998/09/21
> Subject: Re: symbolic tensor calculations
-------8<------
> DEMO(STRAIN1); Derive strain tensor in elasticity of solids
> DEMO(STRESS1); Derive stress tensor in elasticity of solids
> DEMO(TENS_PDE); Generate tensor finite difference equations.
but these appear not be included in Maxima.
Does anyone know if they are available and from where?
Also are there any examples showing how to use tensors to get a
numerical answer or is this simply a matter of assigning values to the
variables as for any other problem?
Glenn
--
Glenn Ramsey 07 8627077
http://www.componic.co.nz
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