To specify a geometric nonlinear analysis
- Add or edit an existing analysis set in the Analysis Commands dialog .
- Select Geometric Non-Linear from the Analysis type drop-down list. This instructs the analysis engine to perform a nonlinear analysis which can account for nonlinear effects of moderate displacement and small strain. This solution holds for where the element distortion is small and small rotations are assumed.
- Select the desired Print option for including analysis results in the output file.
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Specify nonlinear analysis parameters as necessary:
- Type the number of Load steps to use for applying load in stages.
- Type the maximum number of Iterations to use to achieve equilibrium in the deform position within the specified tolerance value.
- Type a absolute displacement limit for the first analysis step in the Displacement control field.
- Type the Tolerance to use for achieving convergence between two sequential iterations.
- Select the frequency of Rebuild Steps of the tangent K matrix.
- Check the Include KG matrix option to add the geometric stiffness to the stiffness matrix.
- (Optional) Check the Target option to specify a displacement target:
- Click OK.