11/02/2014

ANSYS Mechanical application-Linear Buckling Analysis

Many structures require an evaluation of their structural stability.  Thin columns, compression members, and vacuum tanks are all examples of structures where stability considerations are important.

At the onset of instability (buckling) a structure will have a very large change in displacement {Dx} under essentially no change in the load (beyond a small load perturbation).

Eigenvalue or linear buckling analysis predicts the theoretical buckling strength of an ideal linear elastic structure.
This method corresponds to the textbook approach of linear elastic buckling analysis.
The eigenvalue buckling solution of a Euler column will match the classical Euler solution.
Imperfections and nonlinear behavior prevent most real world structures from achieving their theoretical elastic buckling strength.  Linear buckling generally yields unconservative results.
Linear buckling will not account for:
Material response that is inelastic.
Nonlinear effects.
Imperfections in the structure which are not modeled (dents etc.).
Although unconservative, linear buckling has various advantages:
It is computationally cheaper than a nonlinear buckling analysis, and should be run as a first step to estimate the critical load (load at the onset of buckling).
Relative comparisons can be made of the effect of differences in design to buckling
Linear buckling can be used as a design tool to determine what the possible buckling mode shapes may be.
The way in which a structure may buckle can be used as a possible guide in design 
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