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## #1 2019-02-11 09:50:05

nirmaljoshi
Member
From: Japan
Registered: 2018-10-12
Posts: 61

### meaning of elastic analysis in Non-linear analysis (U4.51.11)

Hi,
There are options for elastic analysis in Non-linear analysis (U4.51.11) in section 4.3.1.

My question is what is the purpose of defining elastic behaviours (comportment) for non-linear analysis?
When I ran test file SSNV108a with and without defining the comportment and the result is different. Why should there be such difference, since we just used elastic assumption, doesn't both result should be same?

I also noted that the calculation runs fine without defining the comportment in NL analysis, but the results are different.

Last edited by nirmaljoshi (2019-02-11 09:50:31)

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## #2 2019-02-11 16:59:12

chenghui62000
Member
From: Norway
Registered: 2018-06-19
Posts: 15

### Re: meaning of elastic analysis in Non-linear analysis (U4.51.11)

nirmaljoshi wrote:

My question is what is the purpose of defining elastic behaviours (comportment) for non-linear analysis?

I have the seam question.
In my point of view, only we added the CIMPORTEMENT in the solver, the solver can adapt the nonlinear calculation. otherwise, it will take the element as a linear element.
But I do not know how it works in the program.

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## #3 2019-02-11 17:15:08

GPSalachs
Member
Registered: 2018-03-10
Posts: 31

### Re: meaning of elastic analysis in Non-linear analysis (U4.51.11)

You always add in the comportment area the ELAS keyword regardless of the model successively used or am i getting this wrong?

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## #4 2019-02-11 21:03:39

AsterO'dactyle
Registered: 2007-11-29
Posts: 229

### Re: meaning of elastic analysis in Non-linear analysis (U4.51.11)

Hello,

ELAS in COMPORTEMENT for non-linear operator = MECA_STATIQUE (linear)

(With DEFORMATION = 'PETIT')

Quite strange.

Do you have an example ?

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## #5 2019-02-13 07:49:07

nirmaljoshi
Member
From: Japan
Registered: 2018-10-12
Posts: 61

### Re: meaning of elastic analysis in Non-linear analysis (U4.51.11)

I realized that, this case is applicable, if there is unloading part in your analysis. ELAS will prevent any residual displacement.

Attachments:

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## #6 2019-02-13 20:47:56

AsterO'dactyle
Registered: 2007-11-29
Posts: 229

### Re: meaning of elastic analysis in Non-linear analysis (U4.51.11)

Hello,

This is the definition of an elastic behaviour !

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