Analysis Case: Linear Buckling

Function

Define an Analysis Case for Linear Buckling Analysis.

Call

Main Menu: Analysis > Analysis Case - Linear Buckling...

Analysis Case for Linear Buckling Analysis will be created. In this command, analysis model data and analysis control will be defined.
 

<Add/Modify Analysis Case-Linear Buckling>

Analysis Model

Specify model data sets for Linear Buckling Analysis. The data can be added/removed per set unit.

Output Control

Specify Mesh Sets and Output Types which are to be outputted in the result file. By default, all Mesh Sets and all Output Types are selected.

Output Type

Select the output types of Linear Buckling Analysis. midas FEA spends more analysis time and generates larger result files if many output types are selected.

Bucking Modes

Critical Load Factors

Displacement

Reactions

Elemental Forces

Elastic Strains

Stresses

Equivalent Stresses

Von Mises Stress and Maximum Shear Stress ('Maximum principal stress - minimum principal stress' / 2)

Principal Stresses

Equivalent Strains

The sum of principal strains

Principal Strains

Stress / Strain Calculation Locations

Element Center

Nodes

Analysis Control

Click button to define detail options of Analysis Control.

<Linear Buckling Analysis Control>

Buckling Modes

Number of Modes

Enter the number of modes to be calculated.

Positive Value Only

Produce the eigenvalue results only for the loading direction.

<Load Set, Factor, Load Type>

Specify Scale Factors and Load Types for Load Sets used in Buckling Analysis

There are two kinds of Load Type, Variable and Constant.  Variable represents loading due to external force or pressure, and Constant accounts for static loading such as Body Force(Selfweight).  It is necessary to differentiate a Load Set between Constant and Variable because Constant make influence on Geometric Stiffness, but not related to Critical Buckling Coefficient.

Auto Normal Rotation Constraint for Plate Elements

In order to prevent unnecessary Buckling Modes, this option will restrain rotational degree of freedom on Plate elements. When Plate Element Property has been defined with "Consider Drilling DOF" option (Property > 2D).

Notes

To define detailed setting of the analysis,  please click Analysis Control.