

March 17, 2018 at 2:18 pm

March 17, 2018 at 7:52 pmmattwSubscriber
Hello momidor,
The "Fatigue Sensitivity" in the "Fatigue Tool" can calculate stress life from a range of load values based on the primary loading conditions you set. See a picture below:
See this ANSYS documentation for more help.
There are some considerations you might want to consider for the analysis.
1. Do you have empirical NS data for the given material or are you going to approximate the fatigue life from Goodman, Gerber, or other fits.
2. Is the stress cyclic? What is the stress ratio, R = Min_stress/Max_stress, and mean stress for the given setup? If the cuboid experiences cyclic stretching (also known as tension) but no compression (i.e. the stress varies from zero to a positive value) then the mean stress will be positive.
3. If the loading is random, there is added complexity to the post processing of the fatigue.

March 18, 2018 at 6:40 ammomidorSubscriber
Hi mattwallingford,
Thanks for reply.
ad 1) Material is the typical low carbon steel, let say A 106 A but I haven't fatigue data yet.
ad 2) It's constant amplitude fatigue with the mean stress let say 150 MPa, and the ratio is 150 + 30 = 180 MPa and 150  30 = 120 MPa. The type of the load is the pure streting by mean stress 150 MPa
ad 3) It is simple excercise with no random phenomenon.
In this excercise I asked myself: what is the fatigue strenght of this element with (1) and without (2) the hole inside for 1x10exp+6 numers of cycles ?

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