Fatigue is a very important thing in engineering, especially in design engineering. Also, ANSYS® provides, Fatigue tools to calculate or design your system according to a standard life cycle. Here, we will show you the fatigue options in ANSYS® that you can change or edit.
How To Adjust Fatigue Options In ANSYS® Mechanical?
Click on the ‘Tools’ menu as shown by the red arrow above, then click on ‘Options’. In ‘Options’, click on ‘Fatigue’ as shown in the red box above to adjust the fatigue parameters for your fatigue analyses in ANSYS® Mechanical.
In ‘Fatigue’ options;
- Design Life: When you are doing fatigue calculations, enter here the reference number of cycles for your calculations. The number of cycles will be compared with this number, whether you design will overcome this number of life.
- Analysis Type: This is a drop-down menu that you can select the fatigue theory you will use in your fatigue calculations in ANSYS®. Proper selection of one of these tools is very important in terms of the correctness of your analyses. The options are; SN-None, SN-Goodman, SN-Soderberg, SN-Gerber, and Mean Stress Curves. The Goodman, Soderberg, and Gerber methods are using the theoretical static material properties along with SN curve data, but the Mean Stress Curves method uses experimental curves related to materials.
- Bin Size: As you see above this is below the ‘Cycle Counting’ section. You can select a number 20-200 for bin size, which will create a square matrix in the dimensions of the selected number for rain flow cycle counting.
- Sensitivity options are vital for correct fatigue analysis in ANSYS® Mechanical. In the ‘Sensitivity’ category, you can adjust the percentage of lower bound of loading, according to base loading to obtain a sensitivity curve in ‘Lower Variation’. You can do the same thing in ‘Upper Variation’ by entering a percentage for the upper bound.
- Number Of Fill Points: The default number of points will be plotted on the fatigue sensitivity curve. You can calculate the sensitivity upon one of three options: Life, Damage, and Factor Of Safety.
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These are the general options for fatigue calculations in ANSYS® Mechanical. After adjusting these options according to yourself, you can do your fatigue analyses.
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NOTE: All the screenshots and images are used for educational and informative purposes. Images used courtesy of ANSYS, Inc.