Convergence Quantity for Buckling Analyses

If you select Multi-Pass Adaptive method under the Convergence tab, you select the quantities Creo Simulate uses to calculate convergence. See Percent Convergence for information on how Creo Simulate measures convergence for the multi-pass adaptive method.

For buckling analyses, you can select one of these options:

• Buckling Load Factor (BLF)—Creo Simulate calculates convergence of the buckling load factor for each buckling mode requested.

• BLF, Local Displacement and Local Strain Energy—For each buckling mode, Creo Simulate calculates convergence of the BLF of each mode, of the displacements along each element edge, and of the total strain energy of each element.

Use this option if you are interested in details of mode shapes. However, Creo Simulate is likely to have to go to a higher polynomial order to reach convergence for this option, and takes longer to compute results

• BLF, Local Displacement, Local Strain Energy and RMS Stress—Creo Simulate uses RMS (Root Mean Square) stress for each buckling mode in addition to BLF, displacement, and strain energy to calculate convergence.

The RMS stress error measure is a single scalar value which is proportional to the square root of the estimated error in total strain energy. Creo Simulate checks convergence for RMS stress by extrapolating the total strain energy for three successive calculations. As a result, RMS stress is sensitive to the rate of convergence. Use this option if you are interested in details of mode shapes and modal stresses. This option provides high accuracy, but can also mean greater computation time.

Return to Convergence Options for Structural Analyses.