Alireza's procedure is correct. Also search for *imperfection in abaqus keyword manual.

kindly go through the following tutorial

http://www.maths.cam.ac.uk/computing/software/abaqus_docs/docs/v6.12/pdf_books/EXAMPLES_1.pdf

www.youtube.com/watch?v=dAZa1mEMIyo

 @ Alireza Afaghi Darabi,

I am not writing program. I am using Abaqus Explicit. I will not be able to give the keyword, is there any other procedure to do the same?

@ Prabhakar,

Thanks a lot, The tutorial is very useful

I use Abaqus Standard/Explicit Interactive Edition (6.10).

I am not writing UMAT codes. I am doing simple analysis.

After modelling and giving property, I need to give the step as Linear Perturbation and Buckle instead of General Static. I got till here. Could someone help me with the next...

Try Static Riks. Linear perturbation will give results fr Eigen Value Buckling. For Static Riks give a small point load that will give the necessary geometric deformation.

Dear Rosy

check "Eigenvalue buckling prediction" in Abaqus Analysis User's Manual 

1. In Finite Element Analysis, shell elements can be utilized for effective results. It can lead to huge computational time savings since they allow modeling of thin features with fewer mesh elements. Shell elements are also easier to mesh and less prone to negative Jacobian errors which might occur when using extremely thin solid features.

2.Let h denote the typical thickness of a component while L denotes its typical length. The ratio, h/L, gives some guidance as to when an element is valid for an analysis. When h/L is large, shear deformation is at its maximum importance and the user should use solid elements. When h/L is small, transverse shear deformation is not important and thin shell elements are the most effective choice.

Alireza Afaghi Where do I add the concentrated load if I am modelling a cantilever beam subjected to cyclic loads? Experimental results showed that local buckling occurred close to the fixed end.