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How Can I Get My Nonlinear Analysis to Converge? - ANSYS e-Learning

Nonlinear analysis methods are required whenever geometric, material, or contact nonlinearities exist in a structure. It can often be difficult to obtain convergence in these analyses, especially in models that experience severe deformation, plasticity, and complex contact.  Getting these models to converge can be a very frustrating and time-consuming process.

CAE Associates’ Senior Engineering Manager Steven Hale discusses nonlinear analysis, convergence, and the main causes of non-convergence, and demonstrates different methods for obtaining convergence in a stubborn nonlinear analysis.  Topics of the demonstration include:

  • Plotting and evaluating residuals
  • Reviewing the solution output
  • Listing and interpreting the initial contact status
  • Closing contact gaps to aid convergence
  • Modifying contact properties to aid convergence
  • Modifying the mesh to aid convergence