Define a step with the proper time incrementation and nonlinear solution controls that best allow Helius PFA to reach a converged solution.
We have already defined our model geometry with a 24-ply layup and are now ready to create a load step. Many linear elastic analyses require only a single increment per step. However, a single increment is inadequate for simulations of progressive failure.
- With Abaqus/CAE open, switch to the Step module.
- Create a new Static, General step (Step > Create) named Load_Step.
- For this example we will set the Initial and Maximum Increment size to 0.01 in the Edit Step dialog box.
- Click OK
- Open the General Solution Controls dialog box by clicking Other > General Solution Controls > Edit > Load_Step from the main toolbar. Ignore the warning, and click the Specify radio button.
- From the Time Incrementation tab, enter 1000 for the values of both I0 and IR.
- Click the first tab labeled 'more' and enter 1000 for the values of IP, IC, IL, and IS. Set IT to 10.
- Click OK.
To achieve robust convergence when using Helius PFA, the solution controls must be modified from their default state.
Increasing the solution control values for the Load_Step will ensure Abaqus can take full advantage of the improved convergence characteristics provided by Helius PFA.