Fatigue for Combined Loading & Estimating Number of Cycles Until Failure

Here some conceptual approaches are presented for evaluating questions of fatigue in various modes in which a mechanical component may experience dynamic loading. When stress peaks from all of the types of stress (i.e. bending, torsion, axial) align in-phase and at the same frequency, a method based on von-Mises stress is particularly useful. An example problem is solved for a component loaded in such a way. Equivalent midrange and alternating stresses are computed for this example, and the ASME Elliptic criterion is used to evaluate a fatigue factor of safety. When it is discovered that this factor of safety is less than 1 (implying a finite predicted life) the number of cycles expected before failure is estimated. Playlist for MEEN361 (Advanced Mechanics of Materials):    • MEEN 361: Advanced Mechanics of Materials   Playlist for MEEN462 (Machine Element Design):    • MEEN 462: Machine Element Design   This lecture was presented on February 16, 2018. All retainable rights are claimed by Michael Swanbom. Please subscribe to my YouTube channel and follow me on Twitter: @TheBom_PE Thank you for your support!