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Under Durability Analysis, What is Stress-SafetyFactor,Fatigue-SF and fatigue life ?


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As in the 3 pictures below, can anyone let me know the function of each option?

As in the Stress-safety factor, when should i use ultimate str or yield str ?

As in Fatigue-safety factor, when should i use infinite life or cycles to failure ?
What is fatigue str factor? Is it common to use 1 as its value?

What is the difference between each option under fatigue life criterion ? and under what kind of condition what option should i use ?