What is Geometrical Nonlinearity?
What is Geometrical Nonlinearity?
(OP)
I heard 3 reasons to use Geometrical nonlinear behaviour.
1)FE elements completely distoretd then will use Geometrical nonlinear behaviour.
2)If plastic strain is 6-10%
3)In metal forming process.
Can any body discuss with topic?
1)FE elements completely distoretd then will use Geometrical nonlinear behaviour.
2)If plastic strain is 6-10%
3)In metal forming process.
Can any body discuss with topic?





RE: What is Geometrical Nonlinearity?
As long as your stresses stay inside this linear part, you can perform a linear analysis. Once the strains become too big however, the object will no react in a linear matter to the applied stresses. Hence, non-linear behaviour.
Another reason to use nonlinear is when the deformation of a structure in itself causes the applied loads to change, even if the material is still in the elastic deformation part.
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RE: What is Geometrical Nonlinearity?
Geometrical non-linearity is typical: contact between surfaces, centrifugal stiffening and such phenomena.
RE: What is Geometrical Nonlinearity?
RE: What is Geometrical Nonlinearity?
RE: What is Geometrical Nonlinearity?
thanks for your suggstions,
ya, i understand the your beam example. If suppose i have closed vessel. Is there any chance to vessel come into geometrical nonlinearity? my question is to what are the other parameters to components get in to the geometrical nonlinearity except radious of curvature.
RE: What is Geometrical Nonlinearity?
My rule of thumb is that if the deflected shape will be stronger or weaker than the undeformed shape, then I will turn geometric non-linearities on. Of course, with this type of evaluation, you are automatically into the load-factor type of evaluation rather than the allowable stress type.