Re: anisotropic material, experiment

[EMAIL PROTECTED] (Sergey Litvinov) wrote in message news:<[EMAIL PROTECTED]>...
> Is it possible to measure constants of linear anisotropic material by
> experiments?
> 
> Material is elastic. And we are interesting in the general case of
> anisotropy (21 constants).

Yes it is possible.  There is no ambiguity in the physical meaning of
the relationships.

However, it is very rare that a continuous material will have so few
symmetry elements that all 21 elastic constants will be non-zero. A
material with three orthagonal symmetry axes (orthorhombic) has at
most 9 independent constants.

See Nye's book on the properties of crystals, oxford press, 1957 for a
complete discussion.

Various lecture notes on the web address the same topic; search for
"elasticity", "symmetry", "constants", "Cijkl",  etc.

See Dr. Kirz's notes at: 
http://www.jwave.vt.edu/crcd/kriz/lectures/Anisotropy.html