**radial displacement (mm*)

**internal pressure (MPa*)

u2.05.04 User manual for limit load calculation

Summary

The objective of this note is to provide the information necessary for a user to perform limit load calculations with*Code_Aster*.

The first part describes the main features of the method and its properties.

The second part shows the various steps required to implement in*Code_Aster*.

Finally, the third part presents some implementation remarks based on the Aster test case [V6.04.124] and on the industrial case aimed at determining the pressure limit for a Canopy tank joint.

• 1. Introduction
• 2. The main lines of the method
  • 2.1. Presentation
  • 2.2. An analytical example [7]
  • 2.3. Some useful properties of limit load calculation
• 3. The implementation of boundary analysis
  • 3.1. The calculation steps
  • 3.2. Meshing
  • 3.3. Model
  • 3.4. Material
  • 3.5. Loading
  • 3.6. List of moments
  • 3.7. Calculus
  • 3.8. Post-treatment
• 4. A few implementation notes
  • 4.1. Representative test case: ssnv146a
  • 4.2. More advanced calculation
  • 4.3. Influence of the fineness of the meshes
  • 4.4. Evolution of the estimate with the list of moments
  • 4.5. Problems with symmetries
  • 4.6. Comparison of limit analysis and incremental elastoplastic calculation up to ruin on an example
• 5. Bibliography