r7.01.46 Elasto-visco-plastic law NLH_CSRM for geomaterials

Summary: This document presents the main equations of the law of behavior NLH_CSRM (Non-Linear Hardening Critical State Rock Model) as well as its numerical integration algorithm.

• 1. Introduction
• 2. Constitutive equations
  • 2.1. Free energy
  • 2.2. Thermodynamic forces
  • 2.3. Plasticity and viscoplasticity criteria
  • 2.4. Plastic and viscoplastic flows
• 3. Digital integration
  • 3.1. Unknowns and equations of the nonlinear system
  • 3.2. Flow directions
  • 3.3. Tangent operator
• 4. Material parameters
• 5. Internal variables
• 6. Test cases
• 7. Examples of answers to the material point