Linear Buckling
The Linear Buckling () study and study step are used for estimating the critical load at which a structure becomes unstable.
The Linear Buckling study consists of two study steps: a Stationary study step for applying an external load followed by a Linear Buckling study step. In the second study step, an eigenvalue solver is used to compute the buckling modes and the associated critical load factors.
A Linear Buckling analysis includes the stiffening effects from stresses coming from nonlinear strain terms. The stiffness coming from stresses and material defines an eigenvalue problem in which the eigenvalue is a load factor that, when multiplied with the actual load, gives the critical load in a linear context.
Another way to calculate the critical load is to include large deformation effects and increase the load until the solver fails because the load has reached its critical value.
The Linear Buckling study is available for the Solid Mechanics interfaces using the Structural Mechanics Module or the MEMS Module. It is also available with Shell, Plate, and Truss interfaces when using the Structural Mechanics Module.
Study Settings
Use the Desired number of buckling modes field to specify the number of buckling modes you want the eigenvalue solver to return.
The Include geometric nonlinearity check box and Mesh Selection are described in Common Study Step Settings. There is also detailed information in the Physics and Variables Selection and Values of Dependent Variables sections.
With the Structural Mechanics Module: Bracket — Linear Buckling Analysis, Application Library path Structural_Mechanics_Module/Tutorials/bracket_linear_buckling.