v1.03.125 UMAT002 — Code_Aster-Umat interface test in linear elasticity under multiaxial loading

Summary:

On a linear elastic problem, a comparison is made between Code_Aster- Umat and*Code-Aster* with behavior ELAS. This test involves a simulation of a deformation loading path at a material point, i.e. on a model such that the stress and deformation states are homogeneous at all times. The loading path is multi-axial in order to verify the robustness and reliability of the numerical integration, its insensitivity to a change of units, the invariance with respect to a global rotation applied to the problem, the accuracy of the tangent matrix.

Modeling A: this modeling makes it possible to validate model UMAT in \(\mathrm{3D}\).

• 1. Reference problem
  • 1.1. Geometry
  • 1.2. Material properties
  • 1.3. Boundary conditions and loads
  • 1.4. Initial conditions
• 2. Benchmark solution
  • 2.1. Definition of robustness test cases
  • 2.2. Study of equivalent problems
  • 2.3. Tangent matrix test
  • 2.4. Study of the discretization of the time step
• 3. Modeling A
  • 3.1. Characteristics of modeling
  • 3.2. Tested sizes and results
• 4. Summary of results