# OS-E: 0190 Large Displacement Subcase as Preload to Linear Subcases

Preloaded or Prestressed Linear Analysis is any type of Structural Linear Analysis performed on a structure under prior loading.

Large displacement nonlinear subcase can be selected as preload to linear subcase, which is specified through STATSUB(PRELOAD). This would take the deformed shape of the nonlinear large displacement subcase into account for the subsequent linear subcase.

## Model Files

Refer to Access the Model Files to download the required model file(s).

The model files used in this example include:

- 53_Plate_LGDISP_Support_wPRELOAD.fem
- 53_Disk_LGDISP_Support_wPRELOAD.fem

## Model Description

Model A is a rectangular plate of dimension 1000*200 mm consisting of CQUAD4 elements with average element size of 25. A pressure load of 0.02 MPa along negative Z-direction is considered for subcase 1. The subcase 1 is considered as the preload along with the pressure load of 0.02 MPa in the negative Z-direction for the subsequent linear static subcase.

Model B is a circular plate of radius 300mm and 4mm thickness consisting of CHEXA elements. A pressure load of 1.0 MPa along the negative Z-direction is considered for subcase 1 to perform Nonlinear Static Analysis. The subcase 1 is considered as the preload in the subsequent modal Frequency Response Analysis subcase.

- Young's Modulus
- 210 x 10
^{3}MPa - Poisson's Ratio
- 0.3
- Initial Density
- 7.9 x 10
^{-6}ton/mm^{3}

## Results

The maximum displacement of 293.5 is observed for the node 23 for the nonlinear large displacement subcase and a maximum displacement of 187.7 mm for the subsequent linear subcase.