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nonlinear buckling in ansys
Tue, 2012-01-03 04:05 - asad zahid
I want to do nonlinear buckling of simple cylinder by applying external pressure. I am activating only "large displacement static" option in ansys and apply load in substeps. But after solution is done, how to get buckling pressure??
For linear/eigen value buckling, it is very simple. After solving, in general postprocessor menu, buckling modes are displayed in "results summary".
Please tell me, for nonlinear buckling???
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Non-linear buckling analysis - ANSYS
Hi,Initially you carry out a linear buckling analysis. Linear buckling factor gives you an idea about the load to be scaled in non-linear buckling analysis (NBA). Say, 'L' is the factor (say more than unity) in linear buckling analysis. Scale your load by '2' for instance. Now the load becomes ‘2L’. Now carry out NBA. Since the analysis is non-linear, load is to be applied incrementally. In NBA, when the stiffness of the structure reduces to a negligible value, structure becomes unstable and solution diverges. You have to find out at what time increment (pseudo time) it diverged. Say the pseudo time increment is 'I' (I<1). Then your load factor is, 2L*I. I hope this helps and all the best.- Ramadas