v6.04.196 SSNV196 — Bending 3D beam (stabilized sub-integrated HEXA8 elements)

Summary:

This test makes it possible to compare hexahedral elements with 8 sub-integrated nodes stabilized by the ASM method

to Aster’s standard HEXA8 elements on a 3D beam in pure flex in elasticity and plasticity. A third modeling in HEXA20 makes it possible to compare the results and the performances of the elements.

• 1. Reference problem
  • 1.1. Geometry
  • 1.2. Material properties
  • 1.3. Boundary conditions and loads
• 2. Reference solution
  • 2.1. Calculation method used for the reference solution
  • 2.2. Benchmark results
  • 2.3. Bibliographical references
• 3. Modeling A
  • 3.1. Characteristics of modeling
  • 3.2. Characteristics of the mesh
  • 3.3. Tested values
  • 3.4. Deformed
• 4. B modeling
  • 4.1. Characteristics of modeling
  • 4.2. Characteristics of the mesh
  • 4.3. Tested values
  • 4.4. Note We note that with the same number of meshes (and therefore knots), the results of standard HEXA8 are much worse, in terms of elasticity as well as in plasticity. Moreover, if the number of elements is increased, the reference arrow is never reached, which is the case with the stabilized element. On a mesh with fairly few nodes (250), the stabilized element is more efficient in terms of calculation time (-10%).
• 5. C modeling
  • 5.1. Characteristics of modeling
  • 5.2. Characteristics of the mesh
  • 5.3. Tested values
  • 5.4. NoteThis modeling is the one that is used as a reference for calculations with hexahedra with 8 nodes.
• 6. Summary of results