OS-V: 0435 Clamped Thick Rhombic Plate
Test No. FV22 The behavior of distorted, thick elements in normal modes analysis is examined using OptiStruct.

Figure 1. FE Model with Boundary Conditions and Loadcases
Model Files
Benchmark Model
The 4-node quad elements with 10x10 mesh configuration are used to model the thick rhombic plate. The x-translation, y-translation displacements, and z-rotational displacements are fixed for all of the nodes. In addition, the z-translation, x-rotational and y-rotational are fixed for the nodes along the four edges.
- Property
- Value
- E
- 200 x 109 N/m2
- 0.3
- 8000 kg/m3
Modal Analysis Results
f*
- Closed form solution
Mode 1 | Mode 2 | Mode 3 | |||
---|---|---|---|---|---|
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f* CQUAD4 |
133.95 Hz 0.9937 |
f* CQUAD4 |
201.41 Hz 1.0382 |
f* CQUAD4 |
265.81 Hz 1.0633 |
Mode 4 | Mode 5 | Mode 6 | |||
---|---|---|---|---|---|
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f* CQUAD4 |
283.68 Hz 1.0006 |
f* CQUAD4 |
334.45 Hz 1.1073 |
F[HOE] CQUAD4 |
386.62 Hz 1.0403 |
Reference
NAFEMS R0015 - Selected benchmarks for natural frequency analysis