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Where to find the definition of "First principal strain" definition formula?

Posted Jun 3, 2010, 8:18 a.m. EDT Structural Mechanics 7 Replies

Xiaogai Li
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Hello everyone!

I am using Comsol 3.5a.

I have a question about first principal striain definition in Stucture mechanics module.
From "Physics - Equation system - Subdomain Settings", we can see
all the variables definition there, such as
ex_smsld = ux,
ey_smsld = uy et al.

My problem is,
where can I find the definition of
e1_smsld, which I can select in the postprocessing to directly select and plot it.
But I can not find the definition for this variable.

Does it hide somewhere or...?
Thanks a lot!

BR,
Xiaogai Li
7 Replies Last Post Oct 30, 2012, 1:08 p.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Jun 3, 2010, 11:51 a.m. EDT
Hi

I agree I can neither not find any clear definition in, but there are several references to the principal strain in the smeug.pdf and smeref.pdf docs, inclusive article references

Have fun Comsoling
Ivar
Hi I agree I can neither not find any clear definition in, but there are several references to the principal strain in the smeug.pdf and smeref.pdf docs, inclusive article references Have fun Comsoling Ivar
Ali Anderson
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Posted: 1 decade ago Jun 1, 2012, 3:26 p.m. EDT
Ivar,

Where do I find the files you mentioned ? There are not in my doc folder(s). I found the smeug.pdf online but not the smeref.pdf.


Regards,

Ali
Ivar, Where do I find the files you mentioned ? There are not in my doc folder(s). I found the smeug.pdf online but not the smeref.pdf. Regards, Ali
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Jun 2, 2012, 3:10 a.m. EDT
Hi

they should be in your help doc pdf directory of COMSOL (if you find some on the net, they may be of an older version)

For me COMSOL has still not managed fully to get the v4.2a doc up to the level of 3.5a w.r.t description of all the new variables, but they are close (but have managed to add most of the many new features of v4) so I expect the crossover is coming now in the 4.3 release ;)

--
Good luck
Ivar
Hi they should be in your help doc pdf directory of COMSOL (if you find some on the net, they may be of an older version) For me COMSOL has still not managed fully to get the v4.2a doc up to the level of 3.5a w.r.t description of all the new variables, but they are close (but have managed to add most of the many new features of v4) so I expect the crossover is coming now in the 4.3 release ;) -- Good luck Ivar
Harsha Reddy Aleti
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Posted: 1 decade ago Oct 30, 2012, 12:29 p.m. EDT
Can someone please provide the definitions by posting those principal strain definitions here? I couldn't find the PDF documents.
Can someone please provide the definitions by posting those principal strain definitions here? I couldn't find the PDF documents.
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Oct 30, 2012, 12:55 p.m. EDT
Hi

have you checked the Structural PDF doc p178-179 etc (v4.3a ?)

You have more if you turn on the Equation View nodes and look at a Solid - Linear Elastic Material - Equation sub-node

--
Good luck
Ivar
Hi have you checked the Structural PDF doc p178-179 etc (v4.3a ?) You have more if you turn on the Equation View nodes and look at a Solid - Linear Elastic Material - Equation sub-node -- Good luck Ivar
Harsha Reddy Aleti
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Posted: 1 decade ago Oct 30, 2012, 1:01 p.m. EDT
Thanks Ivar,

As i said earlier, i'm unable to access the documents due to some restrictions. I request someone to please copy-paste the information from the PDFs. The definitions are going to help many more people in the future, if they are unable to access them.
Thanks Ivar, As i said earlier, i'm unable to access the documents due to some restrictions. I request someone to please copy-paste the information from the PDFs. The definitions are going to help many more people in the future, if they are unable to access them.
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Oct 30, 2012, 1:08 p.m. EDT
Hi

then open the view equations and peek therein, you get the same info and more

--
Good luck
Ivar
Hi then open the view equations and peek therein, you get the same info and more -- Good luck Ivar

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