Incremental Method without Eigenvalue Analysis

Product Support
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1

Hi,

When calculating the maximum load-carrying capacity of the model using the Incremental Method without Eigenvalue Analysis (nonlinear), I encounter the following issues:

  1. Without a maximum displacement limit (LC2): The solver reaches the specified maximum number of iterations. Instead of stopping because convergence could not be achieved, it increases the load factor and starts trying to reach equilibrium again. This process repeats another four or five times before the calculation finally stops.

  2. With a maximum displacement limit (LC3): The solver reaches the specified displacement limit, stops increasing the load factor, and starts refining the solution. However, when it reaches the displacement limit again, it simply exceeds it and continues iterating until the maximum number of specified increments is reached.

Is this the intended behavior of the solver, or have I configured something incorrectly?
File:
test1111.rf6 (1.5 MB)

3

Hi dbesed,

both solver actions intended. You may have a look into this webinar and check for settings:

  1. It detects some border and refines calculation. If the then "more detailed" calculations solve, it may increase the load.
  2. Same for this case. It can usually quicker detect your deformation, but solver still tries to finalize calculation.

If you increase e.g. iterations to 300 it solves for me.

Best regards
Stefan Hoffmann