6_Buckling analysis (COMSOL)

In the previous post, I used HyperMesh to perform buckling analyses, calculate analytic solutions, and compare them.

 

 

In this post, I'll use COMSOL to solve the same problem.

I'm actually more familiar with HyperMesh than COMSOL, so my method may not be correct and there may be a better way.

 

I use COMSOL Multiphysics 6.0 version

 

Run COMSOL - 2D - Beam - Add - Study

Preset Studies for Selected Physics Interfaces - Linear Buckling - Done

 

set the length unit to m

 

Right-click the Geometry - More Primitives - Polygon

start point : (0, 0)

end point : (3, 0)

 

Beam - Linear Elastic Material 

Young's modulus : 70e9

Poisson's ratio : 0.33

 

Beam - Cross-Section Data

Section type : Box

${h_y}$ : 0.15

${h_z}$ : 0.15

${t_y}$ : 0.01

${t_z}$ : 0.01

 

Right-click the Beam - Point Load

Force : -160e3 (x-direction)

Select the right side node(3, 0)

 

Right-click the Beam - Fixed Constraint

Select the left side node(0, 0)

 

Right-click the Beam - Prescribed Displacement/Rotation

Displacement in y direction : Prescribed : 0

 

Right-click the Mesh - Size

Element Size : Custom

Element Size Parameters

Maximum element size : 0.1

Minimum element size : 0.1

 

Click the Linear Buckling

Check the Desired number of buckling modes : 5

 

Study - Compute

the shape and critical load factor in the Mode shape in Results.

 

 

 

 

 

Compared to HyperMesh, the geometry was the same.

And the error was very low compared to the analytic solution.