Fatigue life estimation of SH's Main gear drag beam

In this paper، practical fatigue analysis methodology and Commercially available software، ANSYS and Fe-safe، were utilized as to estamate the fatigue life of SH’s Main gear drag beam. SH’s Main gear drag beam is the most important part of this helicopter and with respect to its application، this component is subjected to random loading and then its fatigue life is important. In this paper first with using of ANSYS، the component is modeled and boundary condition and loading is applied to the model and then with life prediction Fe-safe software، fatigue life of this component for given loading is gained. The loading spectrum chosen for this work was that of a generalized helicopter loading sequence which is Felix28. with utilizing of this research، fatigue life of SH’s Main gear drag beam was calculated and we can use this calculated fatigue life in maintenance manual and prevent instantinuse and unexpected fracture and determine if this reworked part is suitable for continued service.