OS-V: 0420 Free Thin Square Plate
Test No. FV12 A thin square plate model, which contains three rigid body modes. OptiStruct investigates the repeated eigenvalues and kinematically incomplete suppressions of the thin plate in Normal Modes Analysis.
Benchmark Model
The 4-node quad elements with 8x8 mesh configuration are used to model the plate. The x-translation, y-translation displacements and z-rotational displacements are fixed for all nodes.
- E
- 200 x 109 N/m2
- 0.3
- 8000 kg/m3
Modal Analysis Results
f*
- Closed form solution
Mode 4 | Mode 5 | Mode 6 | |||
---|---|---|---|---|---|
f* CQUAD4 |
1.622 Hz 0.9964 |
f* CQUAD4 |
2.360 Hz 1.0145 |
f* CQUAD4 |
2.922 Hz 1.0231 |
Modes 7 and 8 | Mode 9 | Mode 10 | |||
---|---|---|---|---|---|
f* CQUAD4 |
4.233 Hz 0.9978 |
f* CQUAD4 |
7.416 Hz 1.0496 |
F[HOE] CQUAD4 |
7.392 Hz 1.1746 |
Model Files
- <install_directory>/hwsolvers/demos/optistruct/verification/fv12.fem
Reference
NAFEMS Ltd, The Standard NAFEMS BENCHMARKS TNSB Rev. 3, NAFEMS Ltd, Scottish Enterprise Technology Park, Whitworth Building, East Kilbride, Glasgow, United Kingdom, 1990.