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From: Pinpress on 4 Aug 2010 22:24
Hi,

I am in need of expressing a strain field in a different coordinate system (new coordinate system is rotated w.r.t. the old one). The strain components are available to me in the old coordinate system (E11, E22, E33, E12, E13, E23), and I just need to re-write it in the new coordinate system. Alternatively, I can get the principal strain components, but still need to get the components in new system.

Someone has a good reference or link to a tutorial how I can do this? Thanks a bunch.
From: TideMan on 4 Aug 2010 23:13
On Aug 5, 2:24 pm, "Pinpress" <noth...(a)nothing.edu> wrote:
> Hi,
>
> I am in need of expressing a strain field in a different coordinate system (new coordinate system is rotated w.r.t. the old one). The strain components are available to me in the old coordinate system (E11, E22, E33, E12, E13, E23), and I just need to re-write it in the new coordinate system. Alternatively, I can get the principal strain components, but still need to get the components in new system.
>
> Someone has a good reference or link to a tutorial how I can do this? Thanks a bunch.

JFGI
From: Pinpress on 5 Aug 2010 12:31
JFF yourself!

TideMan <mulgor(a)gmail.com> wrote in message <9cb80d55-15c2-4911-826f-944251ad56cb(a)m35g2000prn.googlegroups.com>...
> On Aug 5, 2:24 pm, "Pinpress" <noth...(a)nothing.edu> wrote:
> > Hi,
> >
> > I am in need of expressing a strain field in a different coordinate system (new coordinate system is rotated w.r.t. the old one). The strain components are available to me in the old coordinate system (E11, E22, E33, E12, E13, E23), and I just need to re-write it in the new coordinate system. Alternatively, I can get the principal strain components, but still need to get the components in new system.
> >
> > Someone has a good reference or link to a tutorial how I can do this? Thanks a bunch.
>
> JFGI
From: Seth on 5 Aug 2010 13:37
Look up stress or strain transformation. It is in almost any Mechanics / Elasticity textbook - especially in reference to material anisotropy.

{Epsilon_rotated}=[T]*{Epsilon_original} where [T] is the transformation matrix.

Or look up Mohr's circle...
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