A very basic nonlinear FEA
A very basic nonlinear FEA
(OP)
Hello! I am trying to break though the nonlinear domain in Finite Element Analysis. However, everything I find on the Internet is either too long or too complicated. I was wondering if someone could explain me a very simple nonlinear model (for example, a nonlinear spring fixed at one end and axially loaded in the other end). Any brief explanation and/or links would be highly appreciated.
Regards!
Regards!





RE: A very basic nonlinear FEA
1) material non-linearity, where fty is exceeded. a simple model is an open hole (a high Kt)
2) geometry non-linearity, where for example deformations increase the area of contact (ie close gaps).
another day in paradise, or is paradise one day closer ?
RE: A very basic nonlinear FEA
1: Calculate stresses with initial tangent elastic modulus (E) for all elements
- Recalculate E values based on calculated stresses.
- Repeat until change in E value and/or forces and deflections are acceptably small
2: Calculate deflections with initial undeformed shape
- Reform model with calculated deflected shape.
- Repeat until change in forces and deflections are acceptably small
You can (and usually do) do both of those at the same time of course.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: A very basic nonlinear FEA
RE: A very basic nonlinear FEA
Of course, it isn't a traditional FEA, but it is an analysis that uses discrete elements.
http://smath.info/wiki/GetFile.aspx?File=Examples/...
Cheers
Greg Locock
Cheers
Greg Locock
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RE: A very basic nonlinear FEA
Thank you Greg Locock for the link, I will definitely check it carefully (it seems interesting and helpful for me).
@rapt: It may be indeed considered an oxymoron, but since I am not a beginner in linear FEA, I thought a soft transition into nonlinear could be possible :)