Parts and structures subjected to cyclic mechanical and thermal loads will suffer from fatigue. Whether you design engine parts or bridges, the fatigue module, FSTAR, can help you predict how fatigue will affect the overall life of the product, and identify the areas that may be critically damaged. To make the modeling process faster and easier, you can consider stresses associated with load conditions previously calculated through load cases or time-steps. You may also modify the stored stresses in FSTAR's database or specify your own stresses to create the most realistic model for fatigue analysis. 

FSTAR includes the following features: 

Computing partial and total fatigue usage factor - that is, the fraction of product life used up by a combination of fatigue events. It can also list alternating stress intensities for all effective combinations of stress conditions at selected points. 
The capability to interface with the STAR (linear static analysis), NSTAR (nonlinear analysis), ASTAR (dynamic response analysis) and HSTAR (heat transfer analysis) modules, or be used as a stand-alone system with GEOSTAR. 
Displaying fatigue results in GEOSTAR as color-filled contours, color lines or vector plots, and highlighting areas of the design where the greatest amount of damage from fatigue will occur.