Adjusting the Mean Stress Parameter for Fatigue
Fatigue Advisor allows you to indicate whether you want to apply mean stress correction during analysis through the use of configuration options. By default, Fatigue Advisor calculates mean stress correction on a node-by-node basis using three correction methods—Smith-Topper-Watson, Morrow, or no mean stress correction. The software determines which of these methods generates the worst case and reports those results.
You can change these defaults using two configuration options:
• sim_fatigue_mean_stress configuration option — Use this option to indicate whether you want Fatigue Advisor to apply mean stress correction. The default state for this option is
yes.
• sim_fatigue_mean_stress_method configuration option—Use this option to indicate the method Fatigue Advisor should apply—Smith-Watson-Topper, Morrow, or Worst. As mentioned, the default state for this option is Worst. Note that the software only checks the setting for this option if
sim_fatigue_mean_stress is set to
yes.
If you decide to set either of these options to a state other than the default, you should do so based on correlation with test data.