Linear Elements - Linear Response are they related ?? FEA

[willyporto]

Hello,
I found this question in a FEA Exam and I would like your input.

Are Linear Elements and Linear response related?? What is the difference??

Thank you very much for your help!!

Willy

 

[EngAddict]

Could you not have a non-linear time response from linear elements.. Generally though increased deflection is proportional to increased load for linear analysis, s=[k]d.

 

[JoshPlumSE]

There are a number of types of non-linearity in a model. There is material non-linearity and there is geometric non-linearity.

You can have a linear element in a FEM analysis that still considers geometric non-linearity like the P-Delta effect.

 

[crisb]

Its a good question. Is it a homework problem?

"Students are not allowed to post homework problems in the Eng-Tips forums for the purpose of getting answers to their homework."

 

[IDS]

I think it's a good question to generate a discussion, but a poor exam question.

Does a "linear element" refer to the element geometry, the element material response, or what?

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[GregLocock]

Here's some absolutely linear elements behaving in a non linear fashion

http://smath.info/wiki/GetFile.aspx?File=Examples/finger4.pdf

and of course the real world is chock full of non linear systems working in the linear range.



Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?