v2.04.401 SDLV401 - Free-free full sphere

Summary:

This three-dimensional test of modal analysis consists in calculating the natural frequencies of a full free-free sphere.

The interest of this test is to evaluate the robustness and the performance of Code_Aster in the detection of rigid modes and multiple frequencies, when using solid elements.

The reference solution is numerical and is obtained using the software for calculating structures by finite elements SAMCEF.

In this test, we compare the results obtained with two types of elements:

1. element HEXA8 (modeling A)

2. element HEXA20 (modeling B).

In order to determine the specific elements of this system, the so-called SORENSEN method is used.

• 1. Reference problem
  • 1.1. Geometry
  • 1.2. Material properties
  • 1.3. Boundary conditions and loads
• 2. Benchmark solution
  • 2.1. Calculation method used for the reference solution
  • 2.2. Benchmark results
• 3. Modeling A
  • 3.1. Characteristics of modeling A
  • 3.2. Characteristics of the mesh
  • 3.3. Tested sizes and results
  • 3.4. notes
• 4. B modeling
  • 4.1. Characteristics of B modeling
  • 4.2. Characteristics of the mesh
  • 4.3. Tested sizes and results
  • 4.4. notes
• 5. Summary of results