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Plate with Stiffener Members

Model Details and Parameters

The purpose of this test case is to validate the plate/shell element solver in SkyCiv Structural 3D (S3D). The results were compared against a third-party analysis software. In this test case the following model parameters were used:

  • Analysis Type: Linear Static
  • Material: Structural Steel
  • Young’s Modulus: 200,000 MPa
  • Poisson’s Ratio: 0.27
  • Plate Type: Mindlin Plane Stress
  • Plate Size: 5m x 5m (offset 80mm to sit on top of the stiffener members)
  • Plate Thickness: 10 mm
  • Supports: FFFRRR (3D Pin) on two parallel sides
  • Pressure Load: 0.1 kPa normal to plate
  • Members: 5m Length, 150mm x 150mm x 10mm


Results – 10×10 Structured Mesh

Result Location SkyCiv Third-Party 1 Difference 1 Third-Party 2 Difference 2
Max Member Displacement Y (mm) Node 69 -8.43938 -8.27840 1.94% -8.44165 -0.03%
Max Plate Displacement Y (mm) Node 58 -9.20418 -9.02384 2.00% -9.20338 0.01%
Max Von Mises Stress – Element (MPa) Meshed Element 1 8.32423 8.31716 0.09% 8.32423 0.00%
Max Shear Stress, Tresca – Element (MPa) Meshed Element 1 3.61087 3.52626 2.40% 4.54959 -20.63%



Extra Considerations

  • This verification model was created and checked on 28 February 2020. Since this date, the plate solver and S3D software may have been further improved to achieved greater accuracy.
  • Plates are not exact elements like beam and frame elements and therefore the mesh plays a huge role in the results. Always try to use a structured mesh when it is possible to do so.
  • Results between software will never be exactly the same since different elements are used and the nature of plates are approximate
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