# Square Plate Out-of-Plane Vibration (thick shell mesh) — Welcome to LS-DYNA Examples

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Natural frequencies of a solid simply supported plate are determined. Differences between S/R IPI thick shell (elform 2), assumed strain IPI thick shell (elform 3) and assumed strain RI thick shell (elform 5) can be studied. Example 13 from Introductory Manual for LS-DYNA Users by James M. Kennedy.

## Keywords

```*KEYWORD
*TITLE
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_SHELL
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*ELEMENT_TSHELL
*NODE
*BOUNDARY_SPC_SET
*PART
*SECTION_TSHELL
*MAT_ELASTIC
*HOURGLASS
*SET_NODE_LIST
*END```

## Reduced Input

```*KEYWORD
*TITLE
Simply Supported Square Plate: Out-of-Plane Vibration (thick shell mesh)
*CONTROL_IMPLICIT_EIGENVALUE
20       0.0         0       0.0         0       0.0         0       0.0
*CONTROL_IMPLICIT_GENERAL
1       0.0
*CONTROL_SHELL
20.00000         0         0         0         2         2         1
0.0         1
*CONTROL_TERMINATION
1.000000         0       0.0       0.0       0.0
*DATABASE_BINARY_D3PLOT
1.000000
*ELEMENT_TSHELL
*NODE
*BOUNDARY_SPC_SET
*PART
1         1         1         0         1
*SECTION_TSHELL
1         2       0.0         5         0       0.0
*MAT_ELASTIC
1  8000.0002.0000e+11  0.300000       0.0       0.0       0.0
*HOURGLASS
1         4       0.1         0       0.0       0.0       0.0       0.0
*SET_NODE_LIST
1       0.0       0.0       0.0       0.0
1        37        73       109       145       181       217       253
289       293       297       301       305       309       313       317
321       285       249       213       177       141       105        69
33        29        25        21        17        13         9         5
*END
```