v6.04.205 SSNV205 — Drained cyclic shear test at constant isotropic pressure

Summary:

The drained cyclic shear test at constant isotropic pressure makes it possible to simulate the loss of stiffness of a soil as a function of the amplitude of the cyclic deformations applied. These tests also make it possible to determine the dissipation introduced during the charging cycles.

In this test case, we are first interested in the behavior laws of Hujeux (modeling A) and Iwan (modeling B), two laws currently available in Code_Aster for the cyclic behavior of granular materials. We then focus on model CSSM (C modeling) designed around the general representation of granular geomaterials under monotonic and cyclic loads.

In modeling A, carrying out these tests also makes it possible to validate the introduction of cyclical deviatory thresholds from the Hujeux behavior model. The Code_Aster results are compared to the results obtained with the GEFDyn software for the same behavior model.

In modeling B, the results obtained with the Iwan model are compared with those of the modeling with the Hujeux model, considering similar behavior curves for the two models.

In C modeling, the results obtained using model CSSM are compared to those obtained from calculations at the hardware point by MTest.

• 1. Reference problem
  • 1.1. Geometry
  • 1.2. Material properties
  • 1.3. Boundary conditions and loads
  • 1.4. Initial conditions
• 2. Reference solution for modeling A
  • 2.1. Calculation method
  • 2.2. Reference quantities and results
  • 2.3. Uncertainties about the solution
  • 2.4. Bibliographical references
• 3. Modeling A
  • 3.1. Characteristics of modeling
  • 3.2. Characteristics of the mesh
  • 3.3. Tested sizes and results
• 4. B modeling
  • 4.1. Characteristics of modeling
  • 4.2. Characteristics of the mesh
  • 4.3. Tested sizes and results
• 5. C modeling
  • 5.1. Characteristics of modeling
  • 5.2. Characteristics of the mesh
  • 5.3. Tested sizes and results
• 6. Summary of results