Erik Kostson
Ansys Employee
HI ´╗┐@Rameez_ul_Haq´╗┐
First all a "thank you" for people helping you out would
be good a start for your posts, and much appreciated. Thank you. So kindly
appreciate the support and the time I and my Ansys colleagues take to help you
and other students in this forum where you do not pay for support.

So please always have that in your mind , that we do this because
of our good will to help you and anyone else in the forum. I am not obliged to
help you and you are not entitled to support or help (that would only be the
case if someone is paying for Ansys support, like some Ansys users do). So be
thankful first and have this in your mind. Also formulate your questions
better, as it is extremely general, like you said "when should I be making
use of the material's non-linear properties". There could be 1000 of
answers to this and the one I send you is one or two. So one should use nl material when predicting the failure and ultimate load capacity for a reinforced concrete slab answers that question.

AS I said kindly also look at the other examples where one could
calculate the ultimate load capacity for a connection - that requires a nl
material analysis (I mentioned 3 not only concrete), and there are many more
examples where nl material can be used to calculate ultimate load capacities.
So the concrete is another example where nl material is used to calculate the
load capacity of a structure, we do not to think what and how it behaves, it is
just another form of material nonlinear behaviour (the concrete material we
have do not really look at cracks they (material models) are based on
plasticity, but that is not the point here). Other examples are metal forming where we form material which plasticizes of course, and many more manufacturing
type of analysis need nl material. So just search there are many examples of
where we need this.

All the best, and good luck.