Step controls is a very tough business in ANSYS® Mechanical analyses. It is very important to adjust the steps of analyses according to the loads, conditions, and response frequencies of a system. You can use step options in transient structural analyses and static structural analyses in ANSYS®.
You can adjust the application of loads and conditions by turning them on and off on time steps. This gives very good control to obtain the exact physical phenomenon in ANSYS® Mechanical.
Please do not forget that at the end of each step, solutions to the conditions defined in these steps are obtained. In the following steps, the solutions of previous steps are used with new conditions and loads.
Steps are generally used in transient analyses in ANSYS®. To make transient analyses in ANSYS®, you need to know how to adjust step controls.
In an analysis in ANSYS® Mechanical, click on ‘Analysis Settings’ as shown by the red arrow above, you will see all step controls as shown in the green box above.
The accuracy of nonlinear, dynamic analyses performed in ANSYS® Mechanical depends on the definition of smaller minimum time steps allowed.
Definition of time step properly is very important. In general applications, the time step is defined as 1/(20*f) in which ‘f’ is the response frequency of a system.
If your system has contacts, it is recommended from ANSYS® to use 1/(30*fc), in which fc is contact frequency.
These auto time stepping options are important for where there are abrupt changes in loads and nonlinear responses from a system. In other steps that there are no these kinds of abrupt changes, you do not need to use strict time stepping options.
If you make the ‘Auto Time Stepping’ option off, you can directly define one value called ‘Time Step’ for a selected step.
Also, you can define the ‘Auto Time Stepping’ as sub-steps instead of time. It has the same logic with adjusting it as time.
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So, it is very important to adjust steps according to your physical model in ANSYS® Mechanical. According to your physical requirements, proper optimization of steps with the guide of the information above in ANSYS®.
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NOTE: All the screenshots and images are used for educational and informative purposes. Images used courtesy of ANSYS, Inc.